php源碼分析之DZX1.5字符串截斷函數cutstr用法

 　　本文實例講述了php源碼分析之DZX1.5字符串截斷函數cutstr用法。分享給大家供大家參考。具體分析如下：

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 <?php /** * 函數來源DZX1.5，文件所在 /source/function/function_core.php */ define('CHARSET','UTF-8'); function cutstr($string, $length, $dot="...") { if(strlen($string)<=$length) { return $string; } if(strtolower(CHARSET) == "utf-8") { $n = $tn = $noc = 0; while($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; } $strcut = substr($string, 0, $n); } else { for($i = 0; $i < $length; $i++) { $strcut .= ord($string[$i])>127 ? $string[$i].$string[++$i] : $string[$i]; } } $pos = strrpos($strcut, chr(1)); if($pos !== false) { $strcut = substr($strcut,0,$pos); } return $strcut.$dot; } $string = '測試數據庫ablci102020@(#)!)!測試勞動力ddk'; echo cutstr($string,15); /*End of php*/

　　運行結果如下：

　　測試數據庫ablci1020...

　　希望本文所述對大家的php程序設計有所幫助