php怎样挪用函数?【php问题】,php

PHP函数挪用与Java/C/C++是一样的额，经由过程函数名(参数列表)就能够了。

如图：（引荐进修：PHP编程从入门到通晓）

图中，有两处函数挪用，一开始的session_start()是挪用的PHP函数，validate_user($username, $password)是用户自定义函数，一样的体式格局挪用。

PHP函数挪用的多种体式格局

<?php
	// 最常见的函数挪用 --- 1
	function userFunction1($param1, $param2){
		echo 'UserFunction1: Param1 : ',$param1,' , Param2 : ',$param2,'<br/>';
	}
	userFunction1('Hello','world');
 
	// 最常见的函数挪用 --- 2
	$userFunction2 = function($param1, $param2){
		echo 'UserFunction2: Param1 : ',$param1,' , Param2 : ',$param2,'<br/>';
	};
	$userFunction2('Hello', 'PHP');
 
	// 作为回调函数的函数挪用 --- 1
	function funcWithCallback1($callback, $param1, $param2){
		echo 'funcWithCallback1 : ';
		if(is_callable($callback)) $callback($param1, $param2);
	}
	funcWithCallback1($userFunction2,'Hello','world');
 
	// 作为回调函数的函数挪用 --- 2 call_user_func
	function funcWithCallback2($callback, $param1, $param2){
		echo 'funcWithCallback2 : ';
		if(is_callable($callback)) call_user_func($callback, $param1, $param2);
	}
	funcWithCallback2($userFunction2,'Hello','world');
 
	// 一个函数挪用示例： 以 用户注册，修正暗码为例
	$function_pool = array(
		'regist' => array(
			'validateUsername' => function($username){
				return (strtolower($username) !== 'admin') ? true : false;
			},
			'addUser' => function($username, $password){
				$user[$username] = $password;
				echo 'Add user Ok';
				return $user;
			}
		),
		'updatePass' => array(
			'validatePassword' => function($username, $password, $user){
				return (is_array($user) && array_key_exists($username, $user) && $user[$username] == $password);
			},
			'setPassword' => function($username, $password, $user){
				$user[$username] = $password;
				return $user;
			}
		)
	);
 
	function regist($function_pool, $username, $password){
		if(isset($function_pool) && isset($function_pool['regist'])){
			if(isset($function_pool['regist']['validateUsername']) && $function_pool['regist']['validateUsername']($username)){
				return $function_pool['regist']['addUser']($username, $password);
			}else{
				return 'User exists or Uniligel ';
			}
		}
	}
	$user = regist($function_pool, 'Guojunzhou', 'sanyue');
	echo '<pre>';
	print_r($user);
	echo '</pre>';
 
	function updatePass($function_pool, $username, $password, $newPass, $user){
		if(isset($function_pool) && isset($function_pool['updatePass'])){
			if(isset($function_pool['updatePass']['validatePassword']) && $function_pool['updatePass']['validatePassword']($username, $password, $user)){
				return $function_pool['updatePass']['setPassword']($username, $newPass, $user);
			}
		}
	}
	$user = updatePass($function_pool, 'Guojunzhou', 'sanyue', '123456', $user);
	echo '<pre>';
	print_r($user);
	echo '</pre>';
?>

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