PHP中 get

定义

get_defined_constants — 以关联数组形式获取所有常量

用法

get_defined_constants ([ bool $categorize = fal ] ) : array忘不了歌词

返回所有常量，包括内置、扩展或自定义。
categorize 决定是否分类。默认不分类。

示例

<?php  define("my_constant", 1);  print_r(get_defined_constants(true));?>

watcha输出：

array(    [core] => array        (            [e_error] => 1            [e_warning] => 2            [e_par] => 4            [e_notice] => 8            [e_core_error] => 16            [e_core_warning] => 32            [e_compile_error] => 64            [e_compile_warning] => 128            [e_u抑r_error] => 256            [e_ur_warning] => 512            [e_ur_notice] => 1024            [e_all] => 2047            [true] =&释怀是什么意思gt; 1        )    [pcre] => array        (嫖娼处罚            [preg_pattern_order] => 1            [preg_t_order] => 2            [preg_offt_capture] => 256            [preg_split_no_empty] => 1            [preg_split_delim_capture] => 2            [preg_split_offt_capture] => 4            [preg_grep_invert] => 1        )    [ur] => array        (            [my_constant] => 1        ))