php overload for method

overload-typeA-usage.php

<?php

class test{
	use Overload;
	
	function test__num($a){
		return $a * $a;
	}
	function test__num2($a, $b){
		return $a + $b;
	}
	function test__char($s){
		return $s . $s;
	}
	
}

test::$overload_rule = [
	"test" => [
		[
			"type" => ["num", "num"],
			"name" => "num2"
		],[
			"type" => ["num"],
			"name" => "num"
		],[
			"type" => ["char"],
			"name" => "char"
		]
	]
];
test::$argtype_rule = [
	"num" => function($a){
		return is_int($a) || is_float($a);
	},
	"char" => function($a){
		return is_string($a) && strlen($a) === 1;
	}
];

$t = new test();
var_dump($t->test("a"));
var_dump($t->test(123));
var_dump($t->test(123, 234));
try{
	$t->test("ab");
}catch(Exception $e){
	echo "Error: ", $e->getMessage();
}

overload-typeA.php

<?php

trait Overload{
	static $overload_rule = [];
	static $argtype_rule = [];
	
	function __call($name, $args){
		$rule = self::$overload_rule;
		$argtype_rule = self::$argtype_rule;
		if(array_key_exists($name, $rule)){
			$matched_rule = $rule[$name];
			foreach($matched_rule as $item){
				foreach($item["type"] as $idx => $type){
					if($idx === count($args)) continue 2;
					if(isset($argtype_rule[$type]) && $argtype_rule[$type]($args[$idx])){
						continue;
					}else{
						continue 2;
					}
				}
				return [$this, $name . "__" . $item["name"]](...$args);
			}
		}
		throw new Exception("method `${name}' not found");
	}
}

overload-typeB-usage.php

<?php
class test{
	use Overload;
	
	function test__num($a){
		return $a * $a;
	}
	function test__num2($a, $b){
		return $a + $b;
	}
	function test__char($s){
		return $s . $s;
	}
	
	function getOverloadRule(){
		return [
			"base" => [
				"test" => [
					[
						"type" => ["num", "num"],
						"name" => "num2"
					],[
						"type" => ["num"],
						"name" => "num"
					],[
						"type" => ["char"],
						"name" => "char"
					]
				]
			],
			"condition" => [
				"num" => function($a){
					return is_int($a) || is_float($a);
				},
				"char" => function($a){
					return is_string($a) && strlen($a) === 1;
				}
			]
		];
	}
	
}

$t = new test();
var_dump($t->test("a"));
var_dump($t->test(123));
var_dump($t->test(123, 234));
try{
	$t->test("ab");
}catch(Exception $e){
	echo "Error: ", $e->getMessage();
}

overload-typeB.php

<?php

trait Overload{
	
	function __call($name, $args){
		$rule = $this->getOverloadRule();
		$overload_rule = $rule["base"];
		$argtype_rule = $rule["condition"];
		if(array_key_exists($name, $overload_rule)){
			$matched_rule = $overload_rule[$name];
			foreach($matched_rule as $item){
				foreach($item["type"] as $idx => $type){
					if($idx === count($args)) continue 2;
					if(isset($argtype_rule[$type]) && $argtype_rule[$type]($args[$idx])){
						continue;
					}else{
						continue 2;
					}
				}
				return [$this, $name . "__" . $item["name"]](...$args);
			}
		}
		throw new Exception("method `${name}' not found");
	}
	
	abstract function getOverloadRule();
	
}