php深入学习笔记二(函数内置函数)

function foobar($arg, $arg2) {    echo __FUNCTION__, " got $arg and $arg2/n";}html' target='_blank'>class foo {    function bar($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"));

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

$newfunc = create_function('$a,$b', 'return "ln($a) + ln($b) = " . log($a * $b);');echo "New anonymous function: $newfunc/n";echo $newfunc(2, M_E) . "/n";

<?phpfunction sum() {    $acc = 0;    foreach (func_get_args() as $n) {        $acc += $n;    }    return $acc;}echo sum(1, 2, 3, 4);?>

检测函数是否存在

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        ))

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

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