php深入学习笔记二( 函数内置函数 )

1. call_?user_?func_?array

function foobar($arg, $arg2) {
    echo __FUNCTION__, " got $arg and $arg2\n";
}
class foo {
    function bar($arg, $arg2) {
        echo __METHOD__, " got $arg and $arg2\n";
    }
}


// 普通函数调用
call_user_func_array("foobar", array("one", "two"));


// 类成员函数调用
$foo = new foo;
call_user_func_array(array($foo, "bar"), array("three", "four"));

2. call_?user_?func

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

3. create_?function 

$newfunc = create_function('$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

5. forward_?static_?call

6. func_?get_?arg(index) 

7. func_?get_?args 

<?php
function sum() {
    $acc = 0;
    foreach (func_get_args() as $n) {
        $acc += $n;
    }
    return $acc;
}


echo sum(1, 2, 3, 4);
?>

8. func_?num_?args() 

9. function_?exists  

检测函数是否存在

10. get_?defined_?functions 

Array
(
    [internal] => Array
        (
            [0] => zend_version
            [1] => func_num_args
            [2] => func_get_arg
            [3] => func_get_args
            [4] => strlen
            [5] => strcmp
            [6] => strncmp
            ...
            [750] => bcscale
            [751] => bccomp
        )


    [user] => Array
        (
            [0] => myrow
        )


)

11. register_?shutdown_?function

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