<?php
$str='1.png,2.png,3.png,4.png';
$arr_tmp = explode(",",$str);
foreach($arr_tmp as $v)
{
$arr[] = explode(".",$v);
}
$i = 0;
foreach($arr as $val)
{
$val[0] .= "_t";
$arr[$i][0] = $val[0];
$arr[$i] = implode(".",$arr[$i]);
$i++;
}
$str = implode(",",$arr);
var_dump($str);
?>
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