<?php
	
	header("Content-Type: text/plain; charset=UTF-8");
	
	function htmlentities_without_slashes($string) {
		return htmlentities(stripslashes($string), ENT_NOQUOTES, "UTF-8");
	}
	
	$string = "<iframe src=\"http://www.google.com.tr/\" frameborder=\"0\"></iframe>";
	
	print_r(
		htmlentities_without_slashes(
			$string
		)
	);
	
	/*
		$$$ OUTPUT $$$
		
		&lt;iframe src="http://www.google.com.tr/" frameborder="0"&gt;&lt;/iframe&gt;
		
	*/