为什么80%的码农都做不了架构师？>>> 
<?php// PHP打印所有常量print_r(get_defined_constants());/*
输出类似
Array
(
[E_ERROR] => 1
[E_RECOVERABLE_ERROR] => 4096
[E_WARNING] => 2
[E_PARSE] => 4
[E_NOTICE] => 8
[E_STRICT] => 2048
[E_DEPRECATED] => 8192
[E_CORE_ERROR] => 16
[E_CORE_WARNING] => 32
[E_COMPILE_ERROR] => 64
[E_COMPILE_WARNING] => 128
[E_USER_ERROR] => 256
[E_USER_WARNING] => 512
[E_USER_NOTICE] => 1024
[E_USER_DEPRECATED] => 16384
[E_ALL] => 30719
... ...
)
*/?>get_defined_constants() e.g #2:
打印用户自定义常量:
<?php// 打印用户自定义常量define("CONSTANTS","php-print-constants");$user_constants = get_defined_constants(TRUE);print_r($user_constants['user']);/*
输出类似
Array
(
[CONSTANTS] => php-print-constants
[PATH] => /home/qiufeng/
)
*/?>