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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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