Introduction to the usage of php __call, __set and _

Introduction to the usage of php __call, __set and __get

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Release： 2016-07-25 08:59:47

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class foo {
function __call($name,$arguments) {
print("Did you call me? I'm $name!
");
print_r($ arguments);
print("

");
}
function doSecond($arguments)
{
print("Right, $arguments!
");
}
}
$test = new foo();
$test->doFirst('no this function');
$test->doSecond('this function exist');
?>

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__call implements the "overload" action This special method can be used to implement "overloading" actions, so that you can check your parameters and pass them by calling a private method.

Example: Use __call to implement "overload" action

class Magic {
function __call($name,$arguments) {
if($name=='foo') {
if(is_int($arguments[0])) $ this->foo_for_int($arguments[0]);
if(is_string($arguments[0])) $this->foo_for_string($arguments[0]);
}
}
private function foo_for_int($ x) {
print("oh an int!");
}
//by bbs.it-home.org
private function foo_for_string($x) {
print("oh a string!");
}
}
$test = new Magic();
$test->foo(3);
$test->foo("3");
?>

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2. Usage of __set and __get This is a great way to use the __set and __get methods to capture variables and methods that don't exist in an object. Example: __set and __get

class foo {
function __set($name,$val) {
print("Hello, you tried to put $val in $name
");
}
function __get($name) {
print("Hey you asked for $name
");
}
}
$test = new foo();
$test->__set('name',' justcoding');
$test->__get('name');
?>

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In PHP programming, especially in PHP object-oriented programming, flexibly apply __call, __set and _ _get, you can receive unexpected surprises, it is recommended that everyone grasp it firmly.