//Finds nth occourance of string after position of given needle. //Pass $needle argument as empty string [''] if you want to find from start //Pass $needle argument as Int to search string from this position

substr_Index.php

//Finds nth occourance of string after position of given needle.
//Pass $needle argument as empty string [''] if you want to find from start
//Pass $needle argument as Int to search string from this position

function substr_Index( $string, $needle, $delimiter, $nth ){
	$str2 = '';
	$posf = strpos($string, $needle);
	if($posf !== false){
		$string   = substr($string, $posf);
		$posTotal = $posf;		
	}else{
		$posTotal = 0;
	}
	
	if( is_int($needle) ){
		$posTotal = $needle;
	}

	for($i=0; $i < $nth; $i++){
		
		if($str2 != ''){
			$string = $str2;
		}
			 
		$pos   = strpos($string, $delimiter);
		$str2  = substr($string, $pos + 1);
		$posTotal += $pos+1;
		
	}
	return $posTotal-1;
}
			   
//example (returns part of given string from second [:] next from first [#]  )
$str_ = '..:....:..:....#,61185:9789756130346:0000000:369615:97860510:61436=0000000323636';

echo substr($str_, substr_Index( $str_, '#' , ':', 2) );