PHP Intercept string length function detailed

Common character-handling functions

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Strstr (string,string) = STRCHR (,)//from the first occurrence of a string in the previous place to intercept to the last STRRCHR (string,string)//From the last occurrence of a string to the end Strpos (String,string[,int])//Where the first occurrence of a string Strrpos (string,string)//Where the last occurrence of a string SUBSTR (String,int[,int])//intercepts the string from the specified location, specifying the length of the interception. Strlen (String)//Get length of string

Assume

$str = "This is 1 strings";
This string contains a half-width character that is also executed:

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if (strlen ($STR) >10) $str =substr ($STR, 10);

Because the original string $str 10th, 11 characters constitute the Chinese character "character";
String segmentation will split the Chinese character, so that the intercepted string will find garbled phenomenon

Then we can calculate the string length first.

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? Php Header (' content-type:text/html; Charset=utf-8 '); $str = "In the scholar-bureaucrat sdfsdfcxvzv a section"; $pa = '/[x{4e00}-x{9fa5}]/siu '; Preg_match_all ($pa, $str, $r); $count = count ($r [0]); echo "In the current string, a total of $count characters"; if ($count >10) { If the number of Chinese characters is greater than 10, your code } ?>

Add

PHP calculates the length of the string, including how PHP calculates the string length in English, GBK, UTF-8 multiple character sets. English string length
Strlen () is a function of PHP to compute the English string with its own.

The

gbk string length
character evaluates to 2 characters, and the English character evaluates to 1, which enables you to count the functions of the string length in Chinese. function Abslength ($str) {

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$i = 0; while ($i < $len) {        if (Preg_match/^[. chr (0XA1). " -". Chr (0xFF)."] +$/", $str [$i]))        {          $i +=2;       }        Else        {           $i +=1;       } } return $i; }

UTF8 string length
The STRLEN_UTF8 function defined below can be used to count the length of the UTF-8 string, but the function does not consider bytes, which is somewhat similar

The length method of a string in Javascript, in which all characters are computed at 1 lengths. <?php//Description: Calculates the length of the UTF-8 string (suddenly

Slightly-byte scheme)

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function Strlen_utf8 ($STR) { $i = 0; $count = 0; $len = strlen ($STR); while ($i < $len) { $CHR = Ord ($str [$i]); $count + +; $i + +; if ($i >= $len) break; if ($CHR & 0x80) { $CHR <<= 1; while ($CHR & 0x80) { $i + +; $CHR <<= 1; } } } return $count; } $STR = "Www.111cn.net-PHP information"; echo Strlen_utf8 ($STR); ?>

This allows you to accurately intercept your Chinese and English hybrid fonts, such as the example

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Support Gb2312,gbk,utf-8,big5 Chinese interception method /* * Chinese interception, support Gb2312,gbk,utf-8,big5 * * @param string $str to intercept * @param int $start intercept start position * @param int $length intercept length * @param string $charset UTF-8|GB2312|GBK|BIG5 encoding * @param $suffix whether to add a suffix */ Public Function Csubstr ($STR, $start =0, $length, $charset = "Utf-8", $suffix =true) { if (function_exists ("Mb_substr")) { if (Mb_strlen ($str, $charset) <= $length) return $str; $slice = Mb_substr ($str, $start, $length, $charset); } Else { $re [' utf-8 '] = "/[x01-x7f]| [XC2-XDF] [x80-xbf]| [Xe0-xef] [X80-XBF] {2}| [Xf0-xff] [X80-XBF] {3}/"; $re [' gb2312 '] = "/[x01-x7f]| [Xb0-xf7] [xa0-xfe]/]; $re [' gbk '] = "/[x01-x7f]| [X81-xfe] [x40-xfe]/]; $re [' big5 '] = "/[x01-x7f]| [X81-xfe] ([X40-x7e]|xa1-xfe]) /"; Preg_match_all ($re [$charset], $STR, $match); if (count ($match [0]) <= $length) return $str; $slice = Join ("", Array_slice ($match [0], $start, $length)); } if ($suffix) return $slice. " ..."; return $slice; }