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本文档使用 PHP中文网手册 发布
(PHP 4, PHP 5)
strtr — 转换指定字符
$str
, string $from
, string $to
)$str
, array $replace_pairs
)
该函数返回 str
的一个副本,并将在 from
中指定的字符转换为 to
中相应的字符。
比如, $from[$n]中每次的出现都会被替换为
$to[$n],其中 $n 是两个参数都有效的位移(offset)。
如果 from
与 to
长度不相等,那么多余的字符部分将被忽略。 str
的长度将会和返回的值一样。
If given two arguments, the second should be an array in the form array('from' => 'to', ...). The return value is a string where all the occurrences of the array keys have been replaced by the corresponding values. The longest keys will be tried first. Once a substring has been replaced, its new value will not be searched again.
In this case, the keys and the values may have any length, provided that
there is no empty key; additionally, the length of the return value may
differ from that of str
.
However, this function will be the most efficient when all the keys have the
same size.
str
待转换的 字符串 。
from
字符串 中与将要被转换的目的字符 to
相对应的源字符。
to
字符串 中与将要被转换的字符 from
相对应的目的字符。
replace_pairs
参数 replace_pairs
可以用来取代 to
和 from
参数,因为它是以 array('from' => 'to', ...) 格式出现的数组。
返回转换后的 字符串 。
如果 replace_pairs
中包含一个空 字符串 ("")键,那么将返回 FALSE
。
If the str
is not a scalar
then it is not typecasted into a string, instead a warning is raised and
NULL
is returned.
Example #1 strtr() 范例
<?php
$addr = strtr ( $addr , "???" , "aao" );
?>
The next example shows the behavior of strtr() when called with only two arguments. Note the preference of the replacements ("h" is not picked because there are longer matches) and how replaced text was not searched again.
Example #2 使用两个参数的 strtr() 范例
<?php
$trans = array( "hello" => "hi" , "hi" => "hello" );
echo strtr ( "hi all, I said hello" , $trans );
?>
以上例程会输出:
hello all, I said hi
The two modes of behavior are substantially different. With three arguments, strtr() will replace bytes; with two, it may replace longer substrings.
Example #3 strtr() behavior comparison
<?php
echo strtr ( "baab" , "ab" , "01" ), "\n" ;
$trans = array( "ab" => "01" );
echo strtr ( "baab" , $trans );
?>
以上例程会输出:
1001 ba01
[#1] evan dot king at NOSPAM dot example dot com [2015-04-24 15:05:21]
Here's an important real-world example use-case for strtr where str_replace will not work or will introduce obscure bugs:
<?php
$strTemplate = "My name is :name, not :name2.";
$strParams = [
':name' => 'Dave',
'Dave' => ':name2 or :password', // a wrench in the otherwise sensible input
':name2' => 'Steve',
':pass' => '7hf2348', // sensitive data that maybe shouldn't be here
];
echo strtr($strTemplate, $strParams);
// "My name is Dave, not Steve."
echo str_replace(array_keys($strParams), array_values($strParams), $strTemplate);
// "My name is Steve or 7hf2348word, not Steve or 7hf2348word2."
?>
Any time you're trying to template out a string and don't necessarily know what the replacement keys/values will be (or fully understand the implications of and control their content and order), str_replace will introduce the potential to incorrectly match your keys because it does not expand the longest keys first.
Further, str_replace will replace in previous replacements, introducing potential for unintended nested expansions. Doing so can put the wrong data into the "sub-template" or even give users a chance to provide input that exposes data (if they get to define some of the replacement strings).
Don't support recursive expansion unless you need it and know it will be safe. When you do support it, do so explicitly by repeating strtr calls until no more expansions are occurring or a sane iteration limit is reached, so that the results never implicitly depend on order of your replacement keys. Also make certain that any user input will expanded in an isolated step after any sensitive data is already expanded into the output and no longer available as input.
Note: using some character(s) around your keys to designate them also reduces the possibility of unintended mangling of output, whether maliciously triggered or otherwise. Thus the use of a colon prefix in these examples, which you can easily enforce when accepting replacement input to your templating/translation system.
[#2] Romain [2014-10-23 09:44:25]
<?php
public function mb_strtoclean($string){
// Valeur a nettoyer (conversion)
$unwanted_array = array( '?'=>'S', '?'=>'s', '?'=>'Z', '?'=>'z', '?'=>'A', '?'=>'A', '?'=>'A', '?'=>'A', '?'=>'A', '?'=>'A', '?'=>'A', '?'=>'C', '?'=>'E', '?'=>'E',
'?'=>'E', '?'=>'E', '?'=>'I', '?'=>'I', '?'=>'I', '?'=>'I', '?'=>'N', '?'=>'O', '?'=>'O', '?'=>'O', '?'=>'O', '?'=>'O', '?'=>'O', '?'=>'U',
'?'=>'U', '?'=>'U', '?'=>'U', '?'=>'Y', '?'=>'B', '?'=>'Ss', '??'=>'a', '??'=>'a', '?'=>'a', '?'=>'a', '?'=>'a', '?'=>'a', '?'=>'a', '?'=>'c',
'??'=>'e', '??'=>'e', '??'=>'e', '?'=>'e', '??'=>'i', '??'=>'i', '?'=>'i', '?'=>'i', '?'=>'o', '?'=>'n', '??'=>'o', '??'=>'o', '?'=>'o', '?'=>'o',
'?'=>'o', '?'=>'o', '??'=>'u', '??'=>'u', '?'=>'u', '?'=>'y', '?'=>'y', '?'=>'b', '?'=>'y',
' ' => '', '_' => '', '-' => '', '.'=> '', ',' => '', ';' => '');
return mb_strtolower(strtr($string, $unwanted_array ));
}
[#3] doydoy44 [2013-08-12 16:01:23]
The example of VOVA (http://www.php.net/manual/fr/function.strtr.php#111968) is good but the result is false:
His example dont replace the string.
<?php
function f1_strtr() {
for($i=0; $i<1000000; ++$i) {
$new_string = strtr("aboutdealers.com", array(".com" => ""));
}
return $new_string;
}
function f2_str_replace() {
for($i=0; $i<1000000; ++$i) {
$new_string = str_replace( ".com", "", "aboutdealers.com");
}
return $new_string;
}
$start = microtime(true);
$strtr = f1_strtr();
$stop = microtime(true);
$time_strtr = $stop - $start;
$start = microtime(true);
$str_replace = f2_str_replace();
$stop = microtime(true);
$time_str_replace = $stop - $start;
echo 'time strtr : ' . $time_strtr . "\tresult :" . $strtr . "\n";
echo 'time str_replace : ' . $time_str_replace . "\tresult :" . $str_replace . "\n";
echo 'time strtr > time str_replace => ' . ($time_strtr > $time_str_replace);
?>
--------------------------------------
time strtr : 3.9719619750977 result :aboutdealers
time str_replace : 2.9930369853973 result :aboutdealers
time strtr > time str_replace => 1
str_replace is faster than strtr
[#4] dcz at phpbb-seo dot com [2013-08-08 08:26:46]
strstr will issue a notice when $replace_pairs contains an array, even unused, with php 5.5.0.
It was not the case with version at least up to 5.3.2, but I'm not sure the notice was added with exactly 5.5.0.
<?php
$str = 'hi all, I said hello';
$replace_pairs = array(
'all' => 'everybody',
'unused' => array('somtehing', 'something else'),
'hello' => 'hey',
);
// php 5.5.0 Notice: Array to string conversion in test.php on line 8
echo strtr($str, $replace_pairs); // hi everybody, I said hey
?>
since the result is still correct, @strstr seems a working solution.
[#5] lichail at sohu dot com [2013-06-22 01:11:38]
<?php
//note this output null
echo strtr('abc', array('' => ''));
?>
[#6] Hayley Watson [2013-02-01 02:04:53]
Since strtr (like PHP's other string functions) treats strings as a sequence of bytes, and since UTF-8 and other multibyte encodings use - by definition - more than one byte for at least some characters, the three-string form is likely to have problems. Use the associative array form to specify the mapping.
<?php
// Assuming UTF-8
$str = '?bc ?bc'; // strtr() sees this as nine bytes (including two for each ?)
echo strtr($str, '?', 'a'); // The second argument is equivalent to the string "\xc3\x84" so "\xc3" gets replaced by "a" and the "\x84" is ignored
echo strtr($str, array('?' => 'a')); // Works much better
?>
[#7] qeremy [atta] gmail [dotta] com [2013-01-22 19:19:22]
Weird, but strtr corrupting chars, if used like below and if file is encoded in UTF-8;
<?php
$str = '?bc ?bc';
echo strtr($str, '?', 'a');
// output: a?bc a?bc
?>
And a simple solution;
<?php
function strtr_unicode($str, $a = null, $b = null) {
$translate = $a;
if (!is_array($a) && !is_array($b)) {
$a = (array) $a;
$b = (array) $b;
$translate = array_combine(
array_values($a),
array_values($b)
);
}
// again weird, but accepts an array in this case
return strtr($str, $translate);
}
$str = '?bc ?bc';
echo strtr($str, '?', 'a') ."\n";
echo strtr_unicode($str, '?', 'a') ."\n";
echo strtr_unicode($str, array('?' => 'a')) ."\n";
// outputs
// a?bc a?bc
// abc abc
// abc abc
?>
[#8] Tedy [2012-11-01 20:43:50]
Since strtr() is twice faster than strlwr I decided to write my own lowering function which also handles UTF-8 characters.
<?php
function strlwr($string, $utf = 1)
{
$latin_letters = array('?' => 'a',
'?' => 'a',
'?' => 'i',
'?' => 's',
'?' => 's',
'?' => 't',
'?' => 't');
$utf_letters = array('?' => '?',
'?' => '?',
'?' => '?',
'?' => '?',
'?' => '?',
'?' => '?',
'?' => '?');
$letters = array('A' => 'a',
'B' => 'b',
'C' => 'c',
'D' => 'd',
'E' => 'e',
'F' => 'f',
'G' => 'g',
'H' => 'h',
'I' => 'i',
'J' => 'j',
'K' => 'k',
'L' => 'l',
'M' => 'm',
'N' => 'n',
'O' => 'o',
'P' => 'p',
'Q' => 'q',
'R' => 'r',
'S' => 's',
'T' => 't',
'U' => 'u',
'V' => 'v',
'W' => 'w',
'X' => 'x',
'Y' => 'y',
'Z' => 'z');
return ($utf == 1) ? strtr($string, array_merge($utf_letters, $letters)) : strtr($string, array_merge($latin_letters, $letters));
}
?>
This allows you to lower every character (even UTF-8 ones) if you don't set the second parameter, or just lower the UTF-8 ones into their specific latin characters (used when making friendly-urls for example).
I used romanian characters but, of course, you can add your own local characters.
Feel free to use/modify this function as you wish. Hope it helps.
[#9] patrick dot rauchfuss at gmail dot com [2012-08-24 08:04:07]
Here my solution of an classes recursive caseinsentive strtr..
<?php
class String
{
public static function stritr(&$string, $from, $to = NULL)
{
if(is_string($from))
$string = preg_replace("'$from'i", $to, $string);
else if(is_array($from))
{
foreach ($from as $key => $val)
self::stritr($string, $key, $val);
}
return $string;
}
}
// example:
$string = "Hello world. This is just a simple test";
print String::stritr($string, 'WorLd', 'foo');
// array example:
print String::stritr($string, array('WorLd' => 'foo', 'TEST' => 'bar'));
?>
[#10] antimoz at gmail dot com [2012-02-09 03:08:35]
Here is my array for char normalization:
<?php
$normalizeChars = array(
'?'=>'A', '?'=>'A', '?'=>'A', '?'=>'A', '?'=>'A', '?'=>'A', '?'=>'AE', '?'=>'C',
'?'=>'E', '?'=>'E', '?'=>'E', '?'=>'E', '?'=>'I', '?'=>'I', '?'=>'I', '?'=>'I', '?'=>'Eth',
'?'=>'N', '?'=>'O', '?'=>'O', '?'=>'O', '?'=>'O', '?'=>'O', '?'=>'O',
'?'=>'U', '?'=>'U', '?'=>'U', '?'=>'U', '?'=>'Y',
'??'=>'a', '??'=>'a', '?'=>'a', '?'=>'a', '?'=>'a', '?'=>'a', '?'=>'ae', '?'=>'c',
'??'=>'e', '??'=>'e', '??'=>'e', '?'=>'e', '??'=>'i', '??'=>'i', '?'=>'i', '?'=>'i', '?'=>'eth',
'?'=>'n', '??'=>'o', '??'=>'o', '?'=>'o', '?'=>'o', '?'=>'o', '?'=>'o',
'??'=>'u', '??'=>'u', '?'=>'u', '??'=>'u', '?'=>'y',
'?'=>'sz', '?'=>'thorn', '?'=>'y'
);
?>
[#11] Sam [2012-02-01 22:33:40]
Case Insensitive strtr
<?php
function stritr($string, $one, $two=null) {
if (is_string($one)) {
return strtr($string, strtoupper($one) . strtolower($one), "$two$two");
} else if (is_array($one)) {
$strReturn = $string
foreach ($one as $key => $val) {
$strReturn = preg_replace("'$key'i", $val, $strReturn);
}
return $strReturn;
}
return $string;
}
?>
[#12] Michael Schuijff [2011-10-24 10:02:25]
I found that this approach is often faster than strtr() and won't change the same thing in your string twice (as opposed to str_replace(), which will overwrite things in the order of the array you feed it with):
<?php
function replace ($text, $replace) {
$keys = array_keys($replace);
$length = array_combine($keys, array_map('strlen', $keys));
arsort($length);
$array[] = $text;
$count = 1;
reset($length);
while ($key = key($length)) {
if (strpos($text, $key) !== false) {
for ($i = 0; $i < $count; $i += 2) {
if (($pos = strpos($array[$i], $key)) === false) continue;
array_splice($array, $i, 1, array(substr($array[$i], 0, $pos), $replace[$key], substr($array[$i], $pos + strlen($key))));
$count += 2;
}
}
next($length);
}
return implode($array);
}
?>
[#13] Chris [2011-02-04 12:49:03]
Hope this is useful when you need to see ASCII control characters:
<?php
$xlate = array(chr(0) => '^@/NUL/null', chr(1) => '^A/SOH/start of heading', chr(2) => '^B/STX/start of text', chr(3) => '^C/ETX/end of text', chr(4) => '^D/EOT/end of transmisssion', chr(5) => '^E/ENQ/enquiry', chr(6) => '^F/ACK/acknowledge', chr(7) => '^G/BEL/bell', chr(8) => '^H/BS/backspace', chr(9) => '^I/TAB/horizontal tab', chr(10) => '^J/LF/NL/line feed/new line', chr(11) => '^K/VT/vertical tab', chr(12) => '^L/FF/NP/form feed/new page/', chr(13) => '^M/CR/carrige return', chr(14) => '^N/SO/shift out', chr(15) => '^O/SI/shift in', chr(16) => '^P/DLE/data link escape', chr(17) => '^Q/DC1/device control 1', chr(18) => '^R/DC2/device control 2', chr(19) => '^S/DC3/device control 3', chr(20) => '^T/DC4/device control 4', chr(21) => '^U/NAK/negative acknowledge', chr(22) => '^V/SYN/synchronous idle', chr(23) => '^W/ETB/end of transmission block', chr(24) => '^X/CAN/cancel', chr(25) => '^Y/EM/end of medium', chr(26) => '^Z/SUB/substiute', chr(27) => '^[/ESC/escape', chr(28) => '^\/FS/file separator', chr(29) => '^]/GS/group separator', chr(30) => '^^/RS/record separator', chr(31) => '^_/US/unit separator', chr(32) => 'Space');
$x = 0;
$pad = strlen(strlen($str));
while(isset($str[$x]))
echo 'character ', str_pad($x+1, $pad), ' = ', strtr($str[$x], $xlate), ' (ascii ', ord($str[$x++]), ')';
?>
[#14] elloromtz at gmail dot com [2010-04-19 17:08:56]
If you supply 3 arguments and the 2nd is an array, strtr will search the "A" from "Array" (because you're treating it as a scalar string) and replace it with the 3rd argument:
strtr('Analogy', array('x'=>'y'), '_'); //'_nalogy'
so in reality the above code has the same affect as:
strtr('Analogy', 'A' , '_');
[#15] allixsenos at gmail dot com [2009-05-16 08:55:08]
fixed "normaliza" functions written below to include Slavic Latin characters... also, it doesn't return lowercase any more (you can easily get that by applying strtolower yourself)...
also, renamed to normalize()
<?php
function normalize ($string) {
$table = array(
'?'=>'S', '?'=>'s', '?'=>'Dj', '?'=>'dj', '?'=>'Z', '?'=>'z', '?'=>'C', '?'=>'c', '?'=>'C', '?'=>'c',
'?'=>'A', '?'=>'A', '?'=>'A', '?'=>'A', '?'=>'A', '?'=>'A', '?'=>'A', '?'=>'C', '?'=>'E', '?'=>'E',
'?'=>'E', '?'=>'E', '?'=>'I', '?'=>'I', '?'=>'I', '?'=>'I', '?'=>'N', '?'=>'O', '?'=>'O', '?'=>'O',
'?'=>'O', '?'=>'O', '?'=>'O', '?'=>'U', '?'=>'U', '?'=>'U', '?'=>'U', '?'=>'Y', '?'=>'B', '?'=>'Ss',
'??'=>'a', '??'=>'a', '?'=>'a', '?'=>'a', '?'=>'a', '?'=>'a', '?'=>'a', '?'=>'c', '??'=>'e', '??'=>'e',
'??'=>'e', '?'=>'e', '??'=>'i', '??'=>'i', '?'=>'i', '?'=>'i', '?'=>'o', '?'=>'n', '??'=>'o', '??'=>'o',
'?'=>'o', '?'=>'o', '?'=>'o', '?'=>'o', '??'=>'u', '??'=>'u', '?'=>'u', '?'=>'y', '?'=>'y', '?'=>'b',
'?'=>'y', '?'=>'R', '?'=>'r',
);
return strtr($string, $table);
}
?>
[#16] Sidney Ricardo [2008-09-05 11:54:36]
This work fine to me:
<?php
function normaliza ($string){
$a = '??????????????????????????????
?????????????????????????????????????????????';
$b = 'aaaaaaaceeeeiiiidnoooooouuuuy
bsaaaaaaaceeeeiiiidnoooooouuuyybyRr';
$string = utf8_decode($string);
$string = strtr($string, utf8_decode($a), $b);
$string = strtolower($string);
return utf8_encode($string);
}
?>
[#17] dot dot dot dot dot alexander at gmail dot com [2008-03-25 16:09:44]
OK, I debugged the function (had some errors)
Here it is:
if(!function_exists("stritr")){
function stritr($string, $one = NULL, $two = NULL){
if( is_string( $one ) ){
$two = strval( $two );
$one = substr( $one, 0, min( strlen($one), strlen($two) ) );
$two = substr( $two, 0, min( strlen($one), strlen($two) ) );
$product = strtr( $string, ( strtoupper($one) . strtolower($one) ), ( $two . $two ) );
return $product;
}
else if( is_array( $one ) ){
$pos1 = 0;
$product = $string;
while( count( $one ) > 0 ){
$positions = array();
foreach( $one as $from => $to ){
if( ( $pos2 = stripos( $product, $from, $pos1 ) ) === FALSE ){
unset( $one[ $from ] );
}
else{
$positions[ $from ] = $pos2;
}
}
if( count( $one ) <= 0 )break;
$winner = min( $positions );
$key = array_search( $winner, $positions );
$product = ( substr( $product, 0, $winner ) . $one[$key] . substr( $product, ( $winner + strlen($key) ) ) );
$pos1 = ( $winner + strlen( $one[$key] ) );
}
return $product;
}
else{
return $string;
}
}
}
[#18] dot dot dot dot dot alexander at gmail dot com [2008-03-25 10:44:30]
Here is the stritr I always needed... I wrote it in 15 minutes... But only after the idea struck me. Hope you find it helpful, and enjoy...
<?php
if(!function_exists("stritr")){
function stritr($string, $one = NULL, $two = NULL){
if( is_string( $one ) ){
$two = strval( $two );
$one = substr( $one, 0, min( strlen($one), strlen($two) ) );
$two = substr( $two, 0, min( strlen($one), strlen($two) ) );
$product = strtr( $string, ( strtoupper($one) . strtolower($one) ), ( $two . $two ) );
return $product;
}
else if( is_array( $one ) ){
$pos1 = 0;
$product = $string;
while( count( $one ) > 0 ){
$positions = array();
foreach( $one as $from => $to ){
if( ( $pos2 = stripos( $product, $from, $pos1 ) ) === FALSE ){
unset( $one[ $from ] );
}
else{
$positions[ $from ] = $pos2;
}
}
$winner = min( $positions );
$key = array_search( $winner, $positions );
$product = ( substr( $product, 0, $winner ) . $positions[$key] . substr( $product, ( $winner + strlen($key) ) ) );
$pos1 = ( $winner + strlen( $positions[$key] ) );
}
return $product;
}
else{
return $string;
}
}
}
?>
[#19] troelskn at gmail dot com [2008-01-23 15:39:47]
Here's another transcribe function. This one converts cp1252 (aka. Windows-1252) into iso-8859-1 (aka. latin1, the default PHP charset). It only transcribes the few exotic characters, which are unique to cp1252.
function transcribe_cp1252_to_latin1($cp1252) {
return strtr(
$cp1252,
array(
"\x80" => "e", "\x81" => " ", "\x82" => "'", "\x83" => 'f',
"\x84" => '"', "\x85" => "...", "\x86" => "+", "\x87" => "#",
"\x88" => "^", "\x89" => "0/00", "\x8A" => "S", "\x8B" => "<",
"\x8C" => "OE", "\x8D" => " ", "\x8E" => "Z", "\x8F" => " ",
"\x90" => " ", "\x91" => "`", "\x92" => "'", "\x93" => '"',
"\x94" => '"', "\x95" => "*", "\x96" => "-", "\x97" => "--",
"\x98" => "~", "\x99" => "(TM)", "\x9A" => "s", "\x9B" => ">",
"\x9C" => "oe", "\x9D" => " ", "\x9E" => "z", "\x9F" => "Y"));
[#20] ajitsingh4u at gmail dot com [2007-08-06 07:36:40]
function replaceSpecialChars($str)
{
//`(96) ??(130) ?(132) ??(145) ??(146) ??(147) ??(148) ?(180) // equivalent ascii values of these characters.
$str = strtr($str, "`????????", "'','''");
$str = strtr($str, '????', '""');
return $str;
}
[#21] horak.jan AT centrum.cz [2007-05-22 07:11:16]
Here is a function to convert middle-european windows charset (cp1250) to the charset, that php script is written in:
<?php
function cp1250_to_utf2($text){
$dict = array(chr(225) => '??', chr(228) => '?', chr(232) => '?', chr(239) => '?',
chr(233) => '??', chr(236) => '??', chr(237) => '??', chr(229) => '?', chr(229) => '?',
chr(242) => '??', chr(244) => '?', chr(243) => '??', chr(154) => '?', chr(248) => '?',
chr(250) => '??', chr(249) => '?', chr(157) => '?', chr(253) => '?', chr(158) => '?',
chr(193) => '?', chr(196) => '?', chr(200) => '?', chr(207) => '?', chr(201) => '?',
chr(204) => '?', chr(205) => '?', chr(197) => '?', chr(188) => '?', chr(210) => '?',
chr(212) => '?', chr(211) => '?', chr(138) => '?', chr(216) => '?', chr(218) => '?',
chr(217) => '?', chr(141) => '?', chr(221) => '?', chr(142) => '?',
chr(150) => '-');
return strtr($text, $dict);
}
?>
[#22] joeldegan AT yahoo [2006-04-07 08:49:50]
After battling with strtr trying to strip out MS word formatting from things pasted into forms I ended up coming up with this..
it strips ALL non-standard ascii characters, preserving html codes and such, but gets rid of all the characters that refuse to show in firefox.
If you look at this page in firefox you will see a ton of "question mark" characters and so it is not possible to copy and paste those to remove them from strings.. (this fixes that issue nicely, though I admit it could be done a bit better)
<?php
function fixoutput($str){
$good[] = 9; #tab
$good[] = 10; #nl
$good[] = 13; #cr
for($a=32;$a<127;$a++){
$good[] = $a;
}
$len = strlen($str);
for($b=0;$b < $len+1; $b++){
if(in_array(ord($str[$b]), $good)){
$newstr .= $str[$b];
}//fi
}//rof
return $newstr;
}
?>
[#23] martin[dot]pelikan[at]gmail[dot]com [2005-12-29 07:20:45]
// if you are upset with windows' ^M characters at the end of the line,
// these two lines are for you:
$trans = array("\x0D" => "");
$text = strtr($orig_text,$trans);
// note that ctrl+M (in vim known as ^M) is hexadecimally 0x0D
[#24] tomhmambo at seznam dot cz [2005-12-20 02:54:29]
<?php
// Windows-1250 to ASCII
// This function replace all Windows-1250 accent characters with
// thier non-accent ekvivalents. Useful for Czech and Slovak languages.
function win2ascii($str) {
$str = StrTr($str,
"\xE1\xE8\xEF\xEC\xE9\xED\xF2",
"\x61\x63\x64\x65\x65\x69\x6E");
$str = StrTr($str,
"\xF3\xF8\x9A\x9D\xF9\xFA\xFD\x9E\xF4\xBC\xBE",
"\x6F\x72\x73\x74\x75\x75\x79\x7A\x6F\x4C\x6C");
$str = StrTr($str,
"\xC1\xC8\xCF\xCC\xC9\xCD\xC2\xD3\xD8",
"\x41\x43\x44\x45\x45\x49\x4E\x4F\x52");
$str = StrTr($str,
"\x8A\x8D\xDA\xDD\x8E\xD2\xD9\xEF\xCF",
"\x53\x54\x55\x59\x5A\x4E\x55\x64\x44");
return $str;
}
?>
[#25] Ezbakhe Yassin <yassin88 at gmail dot com> [2005-08-31 15:55:09]
Here you are a simple function to rotate a variable according to an array of possible values. You can make a strict comparison (===).
<?php
function rotateValue($string, $values, $strict = TRUE)
{
if (!empty($string) AND is_array($values))
{
$valuesCount = count($values);
for ($i = 0; $i < $valuesCount; $i++)
{
if ($strict ? ($string === $values[$i]) : ($string == $values[$i]))
{
return $values[($i + 1) % $valuesCount];
}
}
}
return FALSE;
}
?>
For example:
- rotateValue("A", array("A", "B", "C")) will return "B"
- rotateValue("C", array("A", "B", "C")) will return "A"
[#26] ru dot dy at gmx dot net [2005-07-10 16:20:47]
Posting umlaute here resulted in a mess. Heres a version of the same function that works with preg_replace only:
<?php
function getRewriteString($sString) {
$string = strtolower(htmlentities($sString));
$string = preg_replace("/&(.)(uml);/", "$1e", $string);
$string = preg_replace("/&(.)(acute|cedil|circ|ring|tilde|uml);/", "$1", $string);
$string = preg_replace("/([^a-z0-9]+)/", "-", html_entity_decode($string));
$string = trim($string, "-");
return $string;
}
?>
[#27] patrick at p-roocks dot de [2005-02-06 14:31:18]
As Daijoubu suggested use str_replace instead of this function for large arrays/subjects. I just tried it with a array of 60 elements, a string with 8KB length, and the execution time of str_replace was faster at factor 20!
Patrick
[#28] [2004-12-11 05:20:03]
If you are going to call strtr a lot, consider using str_replace instead, as it is much faster. I cut execution time in half just by doing this.
<?php
// i.e. instead of:
$s=strtr($s,$replace_array);
// use:
foreach($replace_array as $key=>$value) $s=str_replace($key,$value,$s);
?>
[#29] oliver at modix dot de [2004-10-22 01:08:00]
Replace control characters in a binary string:
<?php
function cc_replace($in) {
for ($i = 0; $i <= 31; $i++) {
$from .= chr($i);
$to .= ".";
}
return strtr($in, $from, $to);
}
?>
[#30] ktogias at math dot upatras dot gr [2004-09-23 03:32:42]
[#31] volkris at tamu dot edu [2004-03-19 06:25:35]
Regarding christophe's conversion, note that the \x## values should be in double quotes, not single, so that the escape will be applied.
[#32] stewey at ambitious dot ca [2004-03-04 18:11:17]
This version of macRomanToIso (originally posted by: marcus at synchromedia dot co dot uk) offers a couple of improvements. First, it removes the extra slashes '\' that broke the original function. Second, it adds four quote characters not supported in ISO 8859-1. These are the left double quote, right double quote, left single quote and right single quote.
Be sure to remove the line breaks from the two strings going into strtr or this function will not work properly.
Be careful what text you apply this to. If you apply it to ISO 8859-1 encoded text it will likely wreak havoc. I'll save you some trouble with this bit of advice: don't bother trying to detect what charset a certain text file is using, it can't be done reliably. Instead, consider making assumptions based upon the HTTP_USER_AGENT, or prompting the user to specify the character encoding used (perhaps both).
<?php
function macRomanToIso($string)
{
return strtr($string,
"\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b
\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97
\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa1\xa4\xa6\xa7
\xa8\xab\xac\xae\xaf\xb4\xbb\xbc\xbe\xbf\xc0\xc1
\xc2\xc7\xc8\xca\xcb\xcc\xd6\xd8\xdb\xe1\xe5\xe6
\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf1\xf2\xf3
\xf4\xf8\xfc\xd2\xd3\xd4\xd5",
"\xc4\xc5\xc7\xc9\xd1\xd6\xdc\xe1\xe0\xe2\xe4\xe3
\xe5\xe7\xe9\xe8\xea\xeb\xed\xec\xee\xef\xf1\xf3
\xf2\xf4\xf6\xf5\xfa\xf9\xfb\xfc\xb0\xa7\xb6\xdf\xae
\xb4\xa8\xc6\xd8\xa5\xaa\xba\xe6\xf8\xbf\xa1\xac
\xab\xbb\xa0\xc0\xc3\xf7\xff\xa4\xb7\xc2\xca\xc1
\xcb\xc8\xcd\xce\xcf\xcc\xd3\xd4\xd2\xda\xdb\xd9
\xaf\xb8\x22\x22\x27\x27");
}
?>
[#33] j at pureftpd dot org [2003-11-30 08:24:56]
Here's a very useful function to translate Microsoft characters into Latin 15, so that people won't see any more square instead of characters in web pages .
function demicrosoftize($str) {
return strtr($str,
"\x82\x83\x84\x85\x86\x87\x89\x8a" .
"\x8b\x8c\x8e\x91\x92\x93\x94\x95" .
"\x96\x97\x98\x99\x9a\x9b\x9c\x9e\x9f",
"'f\".**^\xa6<\xbc\xb4''" .
"\"\"---~ \xa8>\xbd\xb8\xbe");
}
[#34] Fernando "Malk" Piancastelli [2003-10-29 13:31:58]
Here's a function to replace linebreaks to html <p> tags. This was initially designed to receive a typed text by a form in a "insert new notice" page and put in a database, then a "notice" page could get the text preformatted with paragraph tags instead of linebreaks that won't appear on browser. The function also removes repeated linebreaks the user may have typed in the form.
function break_to_tags(&$text) {
// find and remove repeated linebreaks
$double_break = array("\r\n\r\n" => "\r\n");
do {
$text = strtr($text, $double_break);
$position = strpos($text, "\r\n\r\n");
} while ($position !== false);
// find and replace remanescent linebreaks by <p> tags
$change = array("\r\n" => "<p>");
$text = strtr($text, $change);
}
[]'s
Fernando
[#35] hotmail - marksteward [2002-11-26 19:39:26]
[#36] m dot frank at beam dot ag [2002-11-22 05:12:37]
to get the ascii equivalent of unicode characters simply use the
utf8_decode() function
[#37] bisqwit at iki dot fi [2002-08-10 10:18:20]
#!/bin/sh
# This shell script generates a strtr() call
# to translate from a character set to another.
# Requires: gnu recode, perl, php commandline binary
#
# Usage:
# Set set1 and set2 to whatever you prefer
# (multibyte character sets are not supported)
# and run the script. The script outputs
# a strtr() php code for you to use.
#
# Example is set to generate a
# cp437..latin9 conversion code.
#
set1=cp437
set2=iso-8859-15
result="`echo '<? for($c=32;$c<256;$c++)'\
'echo chr($c);'\
|php -q|recode -f $set1..$set2`"
echo "// This php function call converts \$string in $set1 to $set2";
cat <<EOF | php -q
<?php
\$set1='`echo -n "$result"\
|perl -pe "s/([\\\\\'])/\\\\\\\\\\$1/g"`';
\$set2='`echo -n "$result"|recode -f $set2..$set1\
|perl -pe "s/([\\\\\'])/\\\\\\\\\\$1/g"`';
\$erase=array();
\$l=strlen(\$set1);
for(\$c=0;\$c<\$l;++\$c)
if(\$set1[\$c]==\$set2[\$c])\$erase[\$set1[\$c]]='';
if(count(\$erase))
{
\$set1=strtr(\$set1,\$erase);
\$set2=strtr(\$set2,\$erase);
}
if(!strlen(\$set1))echo 'IRREVERSIBLE';else
echo "strtr(\\\$string,\n '",
ereg_replace('([\\\\\\'])', '\\\\\\1', \$set2),
"',\n '",
ereg_replace('([\\\\\\'])', '\\\\\\1', \$set1),
"');";
EOF
[#38] gabi at unica dot edu [2002-07-17 05:32:10]
[#39] symlink23-remove-my-spleen at yahoo dot com [2002-04-18 21:33:11]
As noted in the str_rot13 docs, some servers don't provide the str_rot13() function. However, the presence of strtr makes it easy to build your own facsimile thereof:
if (!function_exists('str_rot13')) {
function str_rot13($str) {
$from = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$to = 'nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM';
return strtr($str, $from, $to);
}
}
This is suitable for very light "encryption" such as hiding email addressess from spambots (then unscrambling them in a mail class, for example).
$mail_to=str_rot13("$mail_to");
[#40] erik at eldata dot se [2001-11-23 09:08:00]
As an alternative to the not-yet-existing function stritr mentioned in the first note above You can easily do this:
strtr("abc","ABCabc","xyzxyz")
or more general:
strtr("abc",
strtoupper($fromchars).strtolower($fromchars),
$tochars.$tochars);
Just a thought.