php源码分析之dzx1.5字符串截断函数cutstr用法，dzx1.5cutstr本文实例讲述了php源码分析之dzx1.5字符串截断函数cutstr用法。分享给大家供大家参考。具体分析如下：
<?php /** * 函数来源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 $length) { $n -= $tn; } $strcut = substr($string, 0, $n); } else { for($i = 0; $i 127 ? $string[$i].$string[++$i] : $string[$i]; } } $pos = strrpos($strcut, chr(1)); if($pos !== false) { $strcut = substr($strcut,0,$pos); } return $strcut.$dot;}$string = '测试数据库ablci102020@(#)!)!测试劳动力ddk';echo cutstr($string,15);/*end of php*/
运行结果如下：
测试数据库ablci1020...
希望本文所述对大家的php程序设计有所帮助。
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