PHP Deep Learning Note II (function built-in function)

1. Call_?user_?func_?array

Call a user-defined function, the first argument is the function name,
The second argument is that the argument to the function must be an indexed array

function Foobar ($arg, $arg 2) {    echo __function__, "Got $arg and $arg 2\n";} class Foo {    function bar ($arg, $arg 2) {        echo __method__, "Got $arg and $arg 2\n";    }} The normal function calls Call_user_func_array ("Foobar", Array ("One", "one"), and/or class member function call $foo = new Foo;call_user_func_array (Array ($foo , "Bar"), Array ("Three", "four"));

2. Call_?user_?func

Calling function arguments cannot pass reference parameters
Call_user_func (function name, parameter 1, parameter 2 ...)

Call_user_func (function ($arg) {print "[$arg]\n";}, ' Test ');

3. Create_?function

Create an anonymous function
$myfunc = create_?function (' function parameter ', ' function body ');
$myfunc (function parameters);

$newfunc = Create_function (' $a, $b ', ' return ' ln ($a) + ln ($b) = ". Log ($a * $b); echo "New anonymous function: $newfunc \ n"; Echo $newfunc (2, M_e). "\ n";

4. Forward_?static_?call_?array

Call a static function in the same way as Call_user_func_array

5. Forward_?static_?call

Call a static function in the same way as Call_user_func

6. Func_?get_?arg (Index)

Returns an item parameter of the parameter list as an indexed value

7. Func_?get_?args

Collect all parameters in an array form

8. Func_?num_?args ()

Returns the number of function pass parameters

9. function_?exists

Detects if a function exists

Function_?exists ("function name"); Detects if a function exists

Ten. Get_?defined_?functions

Returns all defined functions as a two-dimensional array
Include system functions (internal)
and user-defined functions (users)

Array (    [internal] = = Array        (            [0] = Zend_version            [1] = Func_num_args            [2] = = func_get_ Arg            [3] = Func_get_args            [4] = Strlen            [5] = strcmp            [6] = strncmp            ...            [+] = Bcscale            [751] = Bccomp        )    [user] = Array        (            [0] = myrow        ))

Register_?shutdown_?function.

Functions registered by the function when the system executes more than the maximum time fatal error
The registered function is still executed

function Add () {    code here ...} register_?shutdown_?function ("Add");

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