A small function that inserts a string at the specified position in a string

A small function that inserts a string at the specified position in the string:

<?php//Insert a String function Str_insert ($str, $i, $substr) {for ($j =0; $j < $i; $j + +) {$startstr. = $str [$j];} for ($j = $i; $j <strlen ($STR); $j + +) {$laststr. = $str [$j];} $str = ($startstr. $substr. $laststr); return $str;}? >

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