php substr截斷中文半個漢字亂碼問題的解決方案

/** * 改進的substr * edit bbs.it-home.org */ function getstr($string, $length, $encoding = 'utf-8') { $string = trim($string); if($length && strlen($string) > $length) { //截斷字元 $wordscut = ''; if(strtolower($encoding) == 'utf-8') { //utf8編碼 $n = 0; $tn = 0; $noc = 0; while ($n < strlen($string)) { $t = ord($string[$n]); if($t == 9 || $t == 10 || (32 <= $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(240 <= $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); } ?> 複製代碼

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