PHP code PHP code that inserts a string at the specified position of the string

Copy code The code is as follows:

//Insert a string
function str_insert($str, $i, $substr)
{
for($j=0; $j<$i; $j++ ){
$startstr .= $str[$j];
}
for ($j=$i; $j$laststr .= $str[$j];
}
$str = ($startstr . $substr . $laststr);
return $str;
}

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