<?php
function cn_substr_utf8($str, $length, $start=0)
{
if(strlen($str) < $start+1)
{
return '';
}
preg_match_all("/./su", $str, $ar);
var_dump($ar);
$str = '';
$tstr = '';
//为了兼容mysql教程4.1以下版本,与数据库教程varchar一致,这里使用按字节截取
for($i=0; isset($ar[0][$i]); $i++)
{
if(strlen($tstr) < $start)
{
$tstr .= $ar[0][$i];
}
else
{
if(strlen($str) < $length + strlen($ar[0][$i]) )
{
$str .= $ar[0][$i];
}
else
{
break;
}
}
}
return $str;
}
$a = '测试这是一个测试';
//$a = 'xxxxbbbbbnnn';
$b = cn_substr_utf8($a,5,0);
var_dump($b);
?>
- Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
- array(1) {
[0]=>
array(8) {
[0]=>
string(3) "测"
[1]=>
string(3) "试"
[2]=>
string(3) "这"
[3]=>
string(3) "是"
[4]=>
string(3) "一"
[5]=>
string(3) "个"
[6]=>
string(3) "测"
[7]=>
string(3) "试"
}
}
string(9) "测试这"
preferences:
273.78 ms | 406 KiB | 382 Q