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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<?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 <= $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;
}
$string = '测试数据库ablci102020@(#)!)!测试劳动力ddk';
echo cutstr($string,15);
/*End of php*/
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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。