A solution to the garbled character of substr in PHP function

This article introduces, in the use of PHP string interception function substr, the interception of Chinese characters in the case of garbled solution. Please refer to the friends who are in need. PHP string intercept function substr: String substr (string $string, int $start [, int $length]) returns a string of length from start position substr function in the interception of characters, is truncated in bytes, the Chinese characters in the GB2312 encoding is 2 bytes, utf-8 encoding is 3 bytes, so if the truncation of a specified length of the character string, then the returned results will appear garbled. The following two solutions are available for your reference. 1, use the MB_SUBSTR function instead of string mb_substr (string $str, int $start [, int $length [, String $encoding]]) similar to the substr () function, except that the count is counted by the number of characters, Guaranteed character Security using the MB_SUBSTR () function guarantees that no garbled characters are present. Cons: The length statistic becomes the count of characters rather than the number of bytes counted. For display, the same length of Chinese results and English results will show a large difference in display length. 2, the self-built function enhances the SUBSTR function to calculate according to 2 length units, causes the Chinese and English mixed use environment the final display length of the string interception result to be close; discard the last incomplete character, ensure that the display is not garbled, and compatible with Chinese characters commonly used utf-8 encoding and GB2312 encoding , it has good versatility. The complete code is as follows (using the Strtolower function): $length) {//truncate character $wordscut = '; if (Strtolower ($encoding) = = ' Utf-8 ') {//utf8 encoded $n = 0; $tn = 0; $noc = 0; while ($n < strlen ($string)) {$t = Ord ($string [$n]); if ($t = = 9 | | $t = = 10 | | (<= $t && $t <= 126)) {$tn = 1; $n + +; $noc + +; } elseif (194 <= $t && $t <= 223) {$tn = 2; $n + = 2; $noc + = 2; } elseif (224 <= $t && $t < 239) {$tn = 3; $n + = 3; $noc + = 2; } elseif (<= $t && $t <= 247) {$tn = 4; $n + = 4; $noc + = 2; } elseif (248 <= $t && $t <= 251) {$tn = 5; $n + = 5; $noc + = 2; } elseif ($t = = 252 | | $t = = 253) {$tn = 6; $n + = 6; $noc + = 2; } else {$n + +; } if ($noc >= $length) {break; }} if ($noc > $length) {$n-= $tn; } $wordscut = substr ($string, 0, $n); } else {for ($i = 0; $i < $length-1; $i + +) {if (Ord ($string [$i]) > 127) { $wordscut. = $string [$i]. $string [$i + 1]; $i + +; } else {$wordscut. = $string [$i]; }}} $string = $wordscut; } return Trim ($string);} Example Echo getstr ("01234567", 1). ' '; 0echo getstr ("1,234,567", 2). ' '; 0echo getstr ("1,234,567", 3). ' '; 01 Echo getstr ("01234567", 4). ' '; 01 Echo getstr ("01234567", 5). ' '; 012 Echo getstr ("01 a two B 34567", 1). ' '; 0echo Getstr ("1 a two B 34567", 2). ' '; 0echo Getstr ("1 a two B 34567", 3). ' '; 01 Echo getstr ("01 a two B 34567", 4). ' '; 01 Aecho getstr ("01 a two B 34567", 5). ' '; 01 a//This function is modified by the GETSTR () function in Uchome 1.5.?>

