Question

I have the content variable $number['content'] with the placeholder <!--email--> in it which needs to be replaced with $email variable.

Below is whats being stored in the content variable.
<iframe src="url.com&em=<!--email-->&se=51" style="width:900px;height:700px;"></iframe>

I need to be replaced with the variable $email

Answer 1

This would replace should work.

<?php 

$content = '<iframe src="url.com&em=<!--email-->&se=51" style="width:900px;height:700px;"></iframe>';

$content = str_replace('<!-- email -->', $email, $content);

If it is possible I would suggest using sprintf().

<?php

$content = '<iframe src="url.com&em=%s&se=51" style="width:900px;height:700px;"></iframe>';

$content = sprintf($content, $email);