manual-php
Version:
660 lines (572 loc) • 11.8 kB
Markdown
# 函数处理
* [call_user_func_array - 调用回调函数，并把一个数组参数作为回调函数的参数](#calluserfuncarray)
* [call_user_func - 调用回调函数，并把一个参数作为回调函数的参数](#calluserfunc)
* [forward_static_call_array - 转发调用静态方法，并把一个数组参数作为静态方法的参数](#forwardstaticcallarray)
* [forward_static_call - 转发调用静态方法，并把一个参数作为静态方法的参数](#forwardstaticcall)
* [func_get_arg - 返回参数列表的某一项](#funcgetarg)
* [func_get_args - 返回一个包含函数参数列表的数组](#funcgetargs)
* [func_num_args - 返回传递给函数的参数个数](#funcnumargs)
* [function_exists - 如果给定的函数已经被定义就返回 true](#functionexists)
* [get_defined_functions - 返回所有已定义函数的数组](#getdefinedfunctions)
* [register_shutdown_function - 注册一个会在 PHP 中止时执行的函数](#registershutdownfunction)
* [register_tick_function - 在每个 Tick 上注册一个执行函数](#registertickfunction)
* [unregister_tick_function - 取消注册每个 Tick 上执行的函数](#unregistertickfunction)
## call_user_func_array
```php
/**
* Calculate the sum of two integers.
*
* @param int $a
* @param int $b
* @return int
*/
function foo(int $a, int $b): int
{
return $a + $b;
}
/**
* Calculate the sum of two integers.
*
* @param int $a
* @param int $b
* @return int
*/
$foo = function (int $a, int $b): int {
return $a + $b;
};
class Foo
{
/**
* Calculate the sum of two integers.
*
* @param int $a
* @param int $b
* @return int
*/
public function method(int $a, int $b): int
{
return $a + $b;
}
}
class Bar
{
/**
* Calculate the sum of two integers.
*
* @param int $a
* @param int $b
* @return int
*/
public static function method(int $a, int $b): int
{
return $a + $b;
}
}
class Baz extends Foo
{
/**
* Override the parent method.
*
* @param int $a
* @param int $b
* @return int
*/
public function method(int $a, int $b): int
{
return $a * $b;
}
}
class Qux extends Bar
{
/**
* Override the parent method.
*
* @param int $a
* @param int $b
* @return int
*/
public static function method(int $a, int $b): int
{
return $a * $b;
}
}
class Quux
{
/**
* This method is called when tries to call an object as a function.
*
* @param int $a
* @param int $b
* @return int
*/
public function __invoke(int $a, int $b): int
{
return $a + $b;
}
}
var_dump(call_user_func_array('foo', [1, 2])); // int(3)
var_dump(call_user_func_array($foo, [1, 2])); // int(3)
var_dump(call_user_func_array([new Foo(), 'method'], [1, 2])); // int(3)
var_dump(call_user_func_array(['Bar', 'method'], [1, 2])); // int(3)
var_dump(call_user_func_array('Bar::method', [1, 2])); // int(3)
var_dump(call_user_func_array([new Baz(), 'parent::method'], [1, 2])); // int(3)
var_dump(call_user_func_array(['Qux', 'parent::method'], [1, 2])); // int(3)
var_dump(call_user_func_array(new Quux(), [1, 2])); // int(3)
```
## call_user_func
```php
/**
* Calculate the sum of two integers.
*
* @param int $a
* @param int $b
* @return int
*/
function foo(int $a, int $b): int
{
return $a + $b;
}
/**
* Calculate the sum of two integers.
*
* @param int $a
* @param int $b
* @return int
*/
$foo = function (int $a, int $b): int {
return $a + $b;
};
class Foo
{
/**
* Calculate the sum of two integers.
*
* @param int $a
* @param int $b
* @return int
*/
public function method(int $a, int $b): int
{
return $a + $b;
}
}
class Bar
{
/**
* Calculate the sum of two integers.
*
* @param int $a
* @param int $b
* @return int
*/
public static function method(int $a, int $b): int
{
return $a + $b;
}
}
class Baz extends Foo
{
/**
* Override the parent method.
*
* @param int $a
* @param int $b
* @return int
*/
public function method(int $a, int $b): int
{
return $a * $b;
}
}
class Qux extends Bar
{
/**
* Override the parent method.
*
* @param int $a
* @param int $b
* @return int
*/
public static function method(int $a, int $b): int
{
return $a * $b;
}
}
class Quux
{
/**
* This method is called when tries to call an object as a function.
*
* @param int $a
* @param int $b
* @return int
*/
public function __invoke(int $a, int $b): int
{
return $a + $b;
}
}
var_dump(call_user_func('foo', 1, 2)); // int(3)
var_dump(call_user_func($foo, 1, 2)); // int(3)
var_dump(call_user_func([new Foo(), 'method'], 1, 2)); // int(3)
var_dump(call_user_func(['Bar', 'method'], 1, 2)); // int(3)
var_dump(call_user_func('Bar::method', 1, 2)); // int(3)
var_dump(call_user_func([new Baz(), 'parent::method'], 1, 2)); // int(3)
var_dump(call_user_func(['Qux', 'parent::method'], 1, 2)); // int(3)
var_dump(call_user_func(new Quux(), 1, 2)); // int(3)
```
## forward_static_call_array
```php
/**
* Calculate the sum of two integers.
*
* @param int $a
* @param int $b
* @return void
*/
function foo(int $a, int $b)
{
var_dump($a + $b);
}
class Foo
{
/**
* Calculate the sum of two integers.
*
* @param int $a
* @param int $b
* @return void
*/
public function method(int $a, int $b)
{
var_dump($a + $b);
}
}
class Bar
{
/**
* Calculate the sum of two integers.
*
* @param int $a
* @param int $b
* @return void
*/
public static function method(int $a, int $b)
{
var_dump($a + $b);
}
}
class Baz extends Foo
{
/**
* Override the parent method.
*
* @param int $a
* @param int $b
* @return void
*/
public function method(int $a, int $b)
{
var_dump($a * $b);
}
}
class Qux extends Bar
{
/**
* Override the parent method.
*
* @param int $a
* @param int $b
* @return void
*/
public static function method(int $a, int $b)
{
var_dump($a * $b);
}
}
class Quux
{
/**
* This method is called when tries to call an object as a function.
*
* @param int $a
* @param int $b
* @return void
*/
public function __invoke(int $a, int $b)
{
var_dump($a + $b);
}
}
class Quuz
{
/**
* Call different methods.
*
* @param void
* @return void
*/
public static function method()
{
forward_static_call_array('foo', [1, 2]);
forward_static_call_array([new Foo(), 'method'], [1, 2]);
forward_static_call_array(['Bar', 'method'], [1, 2]);
forward_static_call_array('Bar::method', [1, 2]);
forward_static_call_array([new Baz(), 'parent::method'], [1, 2]);
forward_static_call_array(['Qux', 'parent::method'], [1, 2]);
forward_static_call_array(new Quux(), [1, 2]);
}
}
Quuz::method();
// int(3)
// int(3)
// int(3)
// int(3)
// int(3)
// int(3)
// int(3)
```
## forward_static_call
```php
/**
* Calculate the sum of two integers.
*
* @param int $a
* @param int $b
* @return void
*/
function foo(int $a, int $b)
{
var_dump($a + $b);
}
class Foo
{
/**
* Calculate the sum of two integers.
*
* @param int $a
* @param int $b
* @return void
*/
public function method(int $a, int $b)
{
var_dump($a + $b);
}
}
class Bar
{
/**
* Calculate the sum of two integers.
*
* @param int $a
* @param int $b
* @return void
*/
public static function method(int $a, int $b)
{
var_dump($a + $b);
}
}
class Baz extends Foo
{
/**
* Override the parent method.
*
* @param int $a
* @param int $b
* @return void
*/
public function method(int $a, int $b)
{
var_dump($a * $b);
}
}
class Qux extends Bar
{
/**
* Override the parent method.
*
* @param int $a
* @param int $b
* @return void
*/
public static function method(int $a, int $b)
{
var_dump($a * $b);
}
}
class Quux
{
/**
* This method is called when tries to call an object as a function.
*
* @param int $a
* @param int $b
* @return void
*/
public function __invoke(int $a, int $b)
{
var_dump($a + $b);
}
}
class Quuz
{
/**
* Call different methods.
*
* @param void
* @return void
*/
public static function method()
{
forward_static_call('foo', 1, 2);
forward_static_call([new Foo(), 'method'], 1, 2);
forward_static_call(['Bar', 'method'], 1, 2);
forward_static_call('Bar::method', 1, 2);
forward_static_call([new Baz(), 'parent::method'], 1, 2);
forward_static_call(['Qux', 'parent::method'], 1, 2);
forward_static_call(new Quux(), 1, 2);
}
}
Quuz::method();
// int(3)
// int(3)
// int(3)
// int(3)
// int(3)
// int(3)
// int(3)
```
## func_get_arg
```php
/**
* Return all item from the argument list.
*
* @param void
* @return array
*/
function foo(): array
{
return [func_get_arg(0), func_get_arg(1), func_get_arg(2)];
}
var_dump(foo(1, 2, 3)); // array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) }
```
## func_get_args
```php
/**
* Return all item from the argument list.
*
* @param void
* @return array
*/
function foo(): array
{
return func_get_args();
}
var_dump(foo(1, 2, 3)); // array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) }
```
## func_num_args
```php
/**
* Return the number of arguments passed to the function.
*
* @param void
* @return int
*/
function foo(): int
{
return func_num_args();
}
var_dump(foo(1, 2, 3)); // int(3)
```
## function_exists
```php
/**
* Just a test function.
*
* @param void
* @return void
*/
function foo()
{
//
}
var_dump(function_exists('echo')); // bool(false)
var_dump(function_exists('print')); // bool(false)
var_dump(function_exists('foo')); // bool(true)
```
## get_defined_functions
```php
var_dump(get_defined_functions());
```
## register_shutdown_function
```php
/**
* Print a string.
*
* @param void
* @return void
*/
function foo()
{
var_dump('foo');
}
register_shutdown_function('foo');
exit();
// string(3) "foo"
```
## register_tick_function
```php
declare(ticks=1);
/**
* Just a test function.
*
* @param void
* @return void
*/
function foo()
{
var_dump('foo');
}
register_tick_function('foo');
$foo = 1;
if ($foo > 0) {
$foo += 2;
}
// string(3) "foo"
// string(3) "foo"
// string(3) "foo"
```
## unregister_tick_function
```php
declare(ticks=1);
/**
* Just a test function.
*
* @param void
* @return void
*/
function foo()
{
var_dump('foo');
}
register_tick_function('foo');
unregister_tick_function('foo');
$foo = 1;
if ($foo > 0) {
$foo += 2;
}
// string(3) "foo"
```