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<?php
$str = "dÖУ­ÔÚfÔÚÄãÊÇdÎҵĹú¼ÒÀ§gÔÚÓкͣ¬ÈË¡£¹¤";
var_dump(strcut($str,0,9));
function strcut($str,$start,$len){
if($start < 0)
$start = strlen($str)+$start;

$retstart = $start+getOfFirstIndex($str,$start);
echo $retstart;
$retend = $start + $len -1 + getOfFirstIndex($str,$start + $len);
echo $retend;
return substr($str,$retstart,$retend-$retstart+1);
}
//ÅжÏ×Ö·û¿ªÊ¼µÄλÖÃ
function getOfFirstIndex($str,$start){
$char_aci = ord(substr($str,$start-1,1));
if(223<$char_aci && $char_aci<240)
return -1;
$char_aci = ord(substr($str,$start-2,1));
if(223<$char_aci && $char_aci<240)
return -2;
return 0;
}
?>

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in_array ×÷ÓÃÊÇÓÃÓڲ鿴 value ÊÇ·ñÔÚ array ÖдæÔÚ£¬Èç¹û²ÎÊý value ÊÇ×Ö·û´®£¬ÇÒ type ²ÎÊýÉèÖÃΪ true£¬ÔòËÑË÷Çø·Ö´óСд¡£Ôò in_array ÊÇ Çø·Ö´óСд µÄ¡£
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$str = 'a';
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<?php
//Õâ¸öʱºòÊä³öµÄΪbaicai¶ø²»ÊÇbai123cai,ÒòΪstr("pao")<strlen("bai123")
echo strtr("paocai!","pao","bai123");
?>
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 <?php

function checkMobile($str)
{
$pattern = "/^(13|15)\d{9}$/";
if (preg_match($pattern,$str))
{
Return true;
}
else
{
Return false;
}
}
$str = checkMobile("15800000001");
......
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