find_img_url.php

/**
 * @param string $str Text to find <img> src attribute value
 * @param string(optional) $placeholder if <img> src attr is empty use $placeholder  
 * @param boolean(optional) $echo - if true  display value else return value
 * @return string
 */
function ecf_find_img_url($str, $echo = false, $placeholder = 'http://placehold.it/350x150' ) {

	$start = stripos($str, '<img');
	
	if($start !== false){
		$str = substr($str, $start);
		
		$end = stripos($str, '>');
		$str = trim( substr($str, 0, $end+1) );
		
		$start = stripos($str, 'src="');
		$end = stripos($str, '>');
		$str = substr($str, $start+strlen('src="'), $end);
		
		$end = stripos($str, '"');
		$str = substr($str, 0, $end );
		
		if($echo){
			echo $str;
		} else {
			return $str;
		}
	} else {
		if($echo){
			echo $placeholder;
		} else {
			return $placeholder;
		}
	}

}