<?php
function validate_type(&$variable = null, $types = "string", $fail = null){
	
	//$variable is set
	if(isset($variable) || $variable === null){
		//Parse $Types
		if(is_array($types)){ //Type 'Array'
			if(sizeof($types) > 0){
				//Check if the variable matches any given type
				foreach($types as $type){
					if(!is_string($type)){ //Type from 'String' or Type from 'Type'
						$type = gettype($type);
					}
					if(strtolower(gettype($variable)) === strtolower($type)){
						return $variable;
					}
				}
			}else{
				if(is_array($variable)){
					return $variable;
				}
			}
		}else{ //Type from 'String' or Type from 'Type'
			//Check if the variable matches the given type
			if(!is_string($types)){
				$types = gettype($types);
			}
			if(strtolower(gettype($variable)) === strtolower($types)){
				return $variable;
			}
		}
	}
	return $fail;
	
}