操作php得到定义的已定义函数列表:

get_defined_functions

(php 4 >= 4.0.4, PHP 5, PHP 7)

get_defined_functions — Returns an array of all defined functions

array get_defined_functions ( void )

代码:
<?php
print_r(get_defined_functions());

输出:
[internal] => Array
(
[