PHP Chinese and encoding judgment code_PHP tutorial-PHP Tutorial-php.cn

PHP Chinese and encoding judgment code_PHP tutorial

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Release： 2016-07-21 15:37:20

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Encoding range 1. GBK (GB2312/GB18030)
x00-xff GBK double-byte encoding range
x20-x7f ASCII
xa1-xff Chinese
x80-xff Chinese
2. UTF-8 (Unicode)
u4e00-u9fa5 (Chinese)
x3130-x318F (Korean)
xAC00-xD7A3 (Korean)
u0800-u4e00 (Japanese) )
ps: Korean is a character larger than [u9fa5]
Regular example:
preg_replace(”/([x80-xff])/”,””,$str);
preg_replace(”/([u4e00-u9fa5])/”,””,$str);
2. Code example

Copy Code The code is as follows:

 
//Judge whether there is Chinese in the content-GBK (PHP) 
function check_is_chinese($s){ 
return preg_match('/ [x80-xff]./', $s); 
} 
//Get the string length-GBK (PHP) 
function gb_strlen($str){ 
$count = 0; 
for($i=0; $i$s = substr($str, $i, 1); 
if (preg_match("/[x80 -xff]/", $s)) ++$i; 
++$count; 
} 
return $count; 
} 
//Intercept string string-GBK (PHP) 
function gb_substr($str, $len){ 
$count = 0; 
for($i=0; $i if($count == $len) break; 
if(preg_match("/[x80-xff]/", substr($str, $i, 1))) ++$i; 
++ $count; 
} 
return substr($str, 0, $i); 
} 
//Statistical string length-UTF8 (PHP) 
function utf8_strlen($str) { 
$count = 0; 
for($i = 0; $i < strlen($str); $i++){ 
$value = ord($str[$i]); 
if($value > 127) { 
$count++; 
if($value >= 192 && $value <= 223) $i++; 
elseif($value >= 224 && $value <= 239) $i = $i + 2; 
elseif($value >= 240 && $value <= 247) $i = $i + 3; 
else die('Not a UTF-8 compatible string'); 
} 
$count++; 
} 
return $count; 
} 
//Intercept string-UTF8(PHP) 
 function utf8_substr($str,$position,$length){ 
$start_position = strlen($str); 
$start_byte = 0; 
$end_position = strlen($str); 
$count = 0; 
for($i = 0; $i < strlen($str); $i++){ 
if($count >= $position && $start_position > $i){ 
$start_position = $i; 
$start_byte = $count; 
} 
if(($count-$start_byte)>=$length) { 
$end_position = $i; 
break; 
} 
$value = ord($str[$i]); 
if($value > 127){ 
$count++; 
if($value > = 192 && $value <= 223) $i++; 
elseif($value >= 224 && $value <= 239) $i = $i + 2; 
elseif($value >= 240 && $value <= 247) $i = $i + 3; 
else die('Not a UTF-8 compatible string'); 
} 
$count++; 
} 
return(substr($str,$start_position,$end_position-$start_position)); 
} 
//Determine whether there is Korean-UTF-8 (JavaScript) 
function checkKoreaChar(str) { 
for(i=0; iif(((str.charCodeAt(i) > 0x3130 && str.charCodeAt(i) < 0x318F) || (str.charCodeAt (i) >= 0xAC00 && str.charCodeAt(i) <= 0xD7A3))) { 
return true; 
} 
} 
return false; 
} 
/ /Determine whether there are Chinese characters-GBK (JavaScript) 
function check_chinese_char(s){ 
return (s.length != s.replace(/[^x00-xff]/g,"**"). length); 
} 