PHP functions commonly used for mixed Chinese and English typesetting of strings

怪我咯
Release: 2023-03-12 14:24:02
Original
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# Determine whether a certain position is the left or right half of a Chinese character, or not Chinese
# Return value -1 Left 0 Not a Chinese character 1 Right
# Usage

/*  
$a = 'this is 中文';  
print is_chinese($a, 1); // 0  
print is_chinese($a,8); // -1  
print is_chinese($a,9); // 1  
*/  
function is_chinese(&$str, $location) {  
$ch = true;  
$i = $location;  
while(ord($str[$i])>0xa0 && $i >= 0) {  
$ch = !$ch;  
$i --;  
}  
if($i != $location) {  
$f_str = $ch ? 1: -1;  
}  
else {  
$f_str = false;  
}  
return $f_str;  
}  
# 中文
字符串
倒置函数  
# 如果一个将一个有中文的字符串用
strrev
倒过来,就会产生乱码  
/*  
print cstrrev('this is 中文'); // 文中 si siht  
*/  
function cstrrev(&$str) {  
$long = 
strlen
($str);  
for($f_str='', $chinese=false, $i=$long-1; $i>=0; $i--) {  
if(ord($str[$i]) > 0xa0) {  
$chinese = ! $chinese;  
if($chinese == false) {  
$f_str .= $str[$i].$str[$i+1];  
}  
}  
else {  
$f_str .= $str[$i];  
}  
}  
return $f_str;  
}  
/* 中文
字符串截取
函数  
一些中文字符串截取函数经常有一些问题,例如在一些自动换行程序中  
$a=“1中2”;  
经两次截取后,  
c
substr
($str,$a,0,2);  
csubstr($str, $a, 2,2)  
由于载取位置指向“中”的右字节,可能会是这样的结果  
1, 2  
用本函数会产生正确的结果  
1中, 2  
*/  
# start 开始位置,从0开始  
# long = 0 则从start 一直取到字符串尾  
# ltor = true 时从左到右取字符,false 时到右到左取字符  
# $cn_len 中文字符按字节取还是字数取,如果按字数取,则一个中文当一个字节计算  
function csubstr(&$str, $start=0, $long=0, $ltor=true, $cn_len=2) {  
if($long == 0) $long = strlen($str);  
if($ltor == false) $str = cstrrev($str);  
if($cn_len == 1) {  
for($i=0, $fs=0; $i<$start; $fs++)  
$i += (ord($str[$fs]) <= 0xa0) ? 1 : 0.5;  
for($i=0, $fe=$fs; $i<$long; $fe++)  
$i += (ord($str[$fe]) <= 0xa0) ? 1 : 0.5;  
$long = $fe - $fs;  
}  
else {  
$fs = (is_chinese($str, $start) == 1) ? $start - 1 : $start;  
$fe = $long + $start - 1;  
$end = ( is_chinese($str, $fe) == -1 ) ? $fe -1 : $fe;  
$long = $end - $fs + 1;  
}  
$f_str = substr($str, $fs, $long);  
if($ltor == false) $f_str = cstrrev($f_str);  
return $f_str;  
}  
# 取左字符串  
# 当cn_len == 2 时 $long 取左边多少个字,反之则取左边多少个字节  
function cleft(&$str, $long, $cn_len=2) {  
$f_str = csubstr($str, 0, $long, true, $cn_len);  
return $f_str;  
}  
# 取右字符串  
function cright(&$str, $long, $cn_len=2) {  
$f_str = cstrrev($str);  
$f_str = csubstr($f_str, 0, $long, true, $cn_len);  
$f_str = cstrrev($f_str);  
return $f_str;  
}  
# 对含有中文字符的文章分行格式化  
# 再也不会发生因换行问题而产生的种种问题啦!!!  
# 注:文章的每一行必须用 n (chr(13))进行分行  
# $width 每行多少字符  
# $br 将 每行用什么字符当结束符  
function ctext_wrap(&$text, $width=60, $br="<BR>") {  
$lines = 
explode
("n",$text);  
$rows = count($lines);  
for($i=0; $i<$rows; $i++) {  
$len = strlen($lines[$i]);  
for($j=0; $j<$len; $j+=$width) {  
$p = $j + $width - 1;  
$k = 0;  
if($p<$len) {  
while(!is_chinese($lines[$i], $p) && $lines[$i][$p] != &#39; &#39; && $p>$j) {  
$k ++;  
$p --;  
}  
if($p == $j) $k = 0;  
}  
$f_str .= csubstr($lines[$i], $j, $width-$k) . $br;  
$j -= $k;  
}  
}  
return $f_str;  
}
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