php源码分析之DZX1.5字符串截断函数cutstr用法_PHP教程

php源码分析之DZX1.5字符串截断函数cutstr用法

 　　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：

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/** * 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) return $string; } if(strtolower(CHARSET) == "utf-8") { $n = $tn = $noc = 0; while($n $t = ord($string[$n]); if($t == 9 || $t == 10 || (32 $tn = 1; $n++; $noc++; } elseif(194 $tn = 2; $n += 2; $noc += 2; } elseif(224 $tn = 3; $n += 3; $noc += 2; } elseif(240 $tn = 4; $n += 4; $noc += 2; } elseif(248 $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 $strcut .= ord($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; } $string = '测试数据库ablci102020@(#)!)!测试劳动力ddk'; echo cutstr($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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