最强的PHP字符串截取函数
<?php
/***********************************************************************/
/* */
/* Author: */
/* HomePage: www..com */
/* Email: phforum@163.com */
/* QQ:1984412 */
/* */
/***********************************************************************/
function get_substr($string,$start='0',$length='')
{
$start = (int)$start;
$length = (int)$length;
$i = 0;
if(!$string)
{
return;
}
if($start>=0)
{
while($i<$start)
{
if(ord($string[$i])>127)
{
$i = $i+2;
}
else
{
$i++;
}
}
$start = $i;
if($length=='')
{
return substr($string,$start);
}
elseif($length>0)
{
$end = $start+$length;
while($i<$end)
{
if(ord($string[$i])>127)
{
$i = $i+2;
}
else
{
$i++;
}
}
if($end != $i-1)
{
$end = $i;
}
else
{
$end--;
}
$length = $end-$start;
return substr($string,$start,$length);
}
elseif($length==0)
{
return;
}
else
{
$length = strlen($string)-abs($length)-$start;
return get_substr($string,$start,$length);
}
}
else
{
$start = strlen($string)-abs($start);
return get_substr($string,$start,$length);
}
}
?>
