php中ASCⅡ码
简介:这是php中ASCⅡ码的详细页面,介绍了和php,有关的知识、技巧、经验,和一些php源码等。
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以前花了不少时间,找可以把中文转ascii码的php代码,utf-8也只是ascii的一种。后来中手册上找到 了个,把他改为了批量转换,还增加了一个常用的ascii代码还原字符。这个代码写好了有一段时间了,没什么时间把这些贴出来,大家可以看看,这个类不止 只是中文的转换哟
class ascii
{
function decode ( $str )
{
preg_match_all ( " /(d{2,5})/ " , $str , $a ) ;
$a = $a [ 0 ] ;
foreach ( $a as $dec )
{
if ( $dec {
$utf .= chr ( $dec ) ;
}
else if ( $dec {
$utf .= chr ( 192 + (( $dec - ( $dec % 64 )) / 64 )) ;
$utf .= chr ( 128 + ( $dec % 64 )) ;
}
else
{
$utf .= chr ( 224 + (( $dec - ( $dec % 4096 )) / 4096 )) ;
$utf .= chr ( 128 + ((( $dec % 4096 ) - ( $dec % 64 )) / 64 )) ;
$utf .= chr ( 128 + ( $dec % 64 )) ;
}
}
return $utf ;
}
function encode ( $c )
{
$len = strlen ( $c ) ;
$a = 0 ;
while ( $a {
$ud = 0 ;
if ( ord ( $c { $a }) >= 0 && ord ( $c { $a }) {
$ud = ord ( $c { $a }) ;
$a += 1 ;
}
else if ( ord ( $c { $a }) >= 192 && ord ( $c { $a }) {
$ud = ( ord ( $c { $a }) - 192 ) * 64 + ( ord ( $c { $a + 1 }) - 128 ) ;
$a += 2 ;
}
else if ( ord ( $c { $a }) >= 224 && ord ( $c { $a }) {
$ud = ( ord ( $c { $a }) - 224 ) * 4096 + ( ord ( $c { $a + 1 }) - 128 ) * 64 + ( ord ( $c { $a + 2 }) - 128 ) ;
$a += 3 ;
}
else if ( ord ( $c { $a }) >= 240 && ord ( $c { $a }) {
$ud = ( ord ( $c { $a }) - 240 ) * 262144 + ( ord ( $c { $a + 1 }) - 128 ) * 4096 + ( ord ( $c { $a + 2 }) - 128 ) * 64 + ( ord ( $c { $a + 3 }) - 128 ) ;
$a += 4 ;
}
else if ( ord ( $c { $a }) >= 248 && ord ( $c { $a }) {
$ud = ( ord ( $c { $a }) - 248 ) * 16777216 + ( ord ( $c { $a + 1 }) - 128 ) * 262144 + ( ord ( $c { $a + 2 }) - 128 ) * 4096 + ( ord ( $c { $a + 3 }) - 128 ) * 64 + ( ord ( $c { $a + 4 }) - 128 ) ;
$a += 5 ;
}
else if ( ord ( $c { $a }) >= 252 && ord ( $c { $a }) {
$ud = ( ord ( $c { $a }) - 252 ) * 1073741824 + ( ord ( $c { $a + 1 }) - 128 ) * 16777216 + ( ord ( $c { $a + 2 }) - 128 ) * 262144 + ( ord ( $c { $a + 3 }) - 128 ) * 4096 + ( ord ( $c { $a + 4 }) - 128 ) * 64 + ( ord ( $c { $a + 5 }) - 128 ) ;
$a += 6 ;
}
else if ( ord ( $c { $a }) >= 254 && ord ( $c { $a }) { //error
$ud = false ;
}
$scill .= " $ud ; " ;
}
return $scill ;
}
最近在技术群中有位兄弟提出了一个问题:
想让自增的ID格式化为
A001――A999
B001――B999
……
Z001――Z999,
我最初的构思是循环中,分if条件判断出来进行A――Z字母,
但是这样做有个极大的缺点,代码显得很呆板冗余,26个英文字母等于需要26个判断。
后来有人支招将字母变成ASCⅡ码,恰好A――Z等于ASCⅡ码的65――91;
这样就只需要一个函数进行格式化ID就可以了:
function format_string( $num ) {
$tag = floor (( $num - 1 ) / 999 );
// part1计算asc码
$part1 = 65 + $tag ;
// part2计算数字部分
$part2 = $num - 999 * $tag ;
$a = strlen ( $part2 );
for ( $i = 0 ; $i {
$b .= 0 ;
}
$str = chr ( $part1 ) . $b . $part2 ;
return $str ;
}
for ( $i = 1 ; $i {
echo $str = format_string( $i ) . '
' ;
}
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