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function GetTxt($Str,$Begin,$End){
$Start=strpos($Str,$Begin);
$Stop=strpos($Str,$End);
return substr($Str, $Start,$Stop);
}
<?php
echo strlen("www.sunchis.com");
echo strlen("三知开发网");
?>
<?php
$str = "三知sunchis开发网";
echo strlen($str)."<br>"; //结果:22
echo mb_strlen($str,"UTF8")."<br>"; //结果:12
$strlen = (strlen($str)+mb_strlen($str,"UTF8"))/2;
echo $strlen; //结果:17
?>