PHP callback function type transfer method

This article mainly shares with you the callback function type transfer method in PHP. We test it here through the array_map() function, hoping to help everyone.

Method 1, global function

function foo($val){
	return intval($val)+1;
}
$arr = array('a',2,'b',5,'c',7);
//回调函数传递方式
$res = array_map('foo', $arr);
/**
输出如下：
array (size=6)
  0 => int 1
  1 => int 3
  2 => int 1
  3 => int 6
  4 => int 1
  5 => int 8
*/

Method 2, class public function

class Demo {
	public function foo($val){
		return intval($val)+1;
	}
}
$arr = array('a',2,'b',5,'c',7);
//回调函数传递方式
$res = array_map(array(new Demo, 'foo'), $arr);

Method 3, class private function

class Demo {
	private function foo($val){
		return intval($val)+1;
	}
	public function test(){
		$arr = array('a',2,'b',5,'c',7);
        //回调函数传递方式
		$res = array_map(array($this, 'foo'), $arr);
		return $res;
	}
}
$demo = new Demo;
$result = $demo->test();

Method 4, class public static Method

class Demo {  
    static public function foo($val){  
        return intval($val)+1;  
    }  
}  
  
$arr = array('a',2,'b',5,'c',7);  
//回调函数传递方式  以下两种方式都可以
$res = array_map('Demo::foo', $arr); 
//$res = array_map(array('Demo', 'foo'), $arr);

Method 5, class private static method

class Demo {
	static private function foo($val){
		return intval($val)+1;
	}
	static public function test(){
		$arr = array('a',2,'b',5,'c',7);
        //回调函数传递方式  这里可以使用两种传递方式
		$res = array_map(array('self', 'foo'), $arr);
		//$res = array_map('self::foo', $arr);
		//$res = array_map(array('Demo', 'foo'), $arr);
		//$res = array_map('Demo::foo', $arr);
		return $res;
	}
}
$result = Demo::test();

Method 6, anonymous function

$foo = function($val){
return intval($val)+1;
};
$arr = array('a',2,'b',5,'c',7);
//回调函数传递方式
$res = array_map($foo, $arr);

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