We can use strrpos function to find the position of the string and use substr function to insert the particular string in particular position.
<?php
$html = "\html/Please Click Here to Complete Questionnaire/html/"
$str_to_insert = "pramodh";
$pos = strrpos($html,"Please Click Here to Complete Questionnaire")+10;
//$newstr = substr_replace($html, $str_to_insert, $pos, 0);
$str = stripslashes(substr($html, 0, $pos) . $str_to_insert . substr($html, $pos));
//echo strrpos("I love php too!","php");
//var_dump($str);
var_dump(strrpos($str,"prmodh”)) ;
var_dump(json_encode($str));
?>
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