php $_ENV的详解 存储一些系统环境变量
php中的$_ENV存储了一些系统的环境变量,因环境不同而值不同.
但有时候$_ENV是空的,可能有以下原因:
在 php.ini中的variables_order值为"GPCS",也就是说系统在定义PHP预定义变量时的顺序是 GET,POST,COOKIES,SERVER,没有定义Environment(E),
你可以修改php.ini文件的variables_order值为你想要的顺序,如:"EGPCS"。这时,$_ENV的值就可以取得了
EGPCS值:(EGPCS是Environment、Get、Post、Cookies、Server的缩写 -- 这是PHP中外部变量来源的全部范围).
你可以用foreach来遍历$_ENV的数据,也可以直接用print_r($_ENV)来打印这个变量,查看他的数据.
$_ENV记载了一些系统环境变量(因为牵扯到实际的操作系统,所以不可能给出$_ENV的完整列表)。
$_ENV为空的可能是原因是:
你的php.ini的variables_order值为"GPCS",也就是说系统在定义PHP预定义变量时的顺序是 GET,POST,COOKIES,SERVER,没有定义Environment(E),你可以修改php.ini文件的 variables_order值为你想要的顺序,如:"EGPCS"。这时,$_ENV的值就可以取得了
EGPCS值(EGPCS是Environment、Get、Post、Cookies、Server的缩写 -- 这是PHP中外部变量来源的全部范围)

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