php深入学习笔记2( 函数内置函数 )

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

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");