PHP Server environment variable $_env_php tutorial

PHP $_env variables

$_env is an array that contains server-side environment variables. It is a super global variable in PHP, and we can access it directly from anywhere in the PHP program.

$_ENV just passively accepts server-side environment variables and transforms them into array elements that you can try to print directly:

Print_r ($_ENV);

is limited to space, where the printed results are no longer listed, and the results printed on different servers may be completely different.

$_env array elements

The elements in the $_ENV array (array cells) vary greatly with the server environment, so the complete list cannot be listed as $_server. The following are the more common elements that the $_env array contains:

$_server[' path ': Environment variable path.

$_server[' CLASSPATH ': System CLASSPATH path.

$_server[' lib ': System LIB Library path.

$_server[' include ': System include path, note the PHP contains the path is not the same.

$_server[' OS ': Operating system type.

$_server[' LANG ': System language, such as en_US or ZH_CN.

$_server[' PWD ']: Current working directory.

$_server[' temp ']: System TEMP path.

$_server[' ap_parent_pid ': The current process ID number.

$_server[' number_of_processors ': Number of system CPUs.

The reason and solution of the empty $_env

If the printout $_env is empty, you can check the configuration of the php.ini:

Variables_order = "Egpcs"

The above configuration represents the source and order of external variables accepted by PHP, EGPCS is the abbreviation for environment, Get, Post, Cookies, and server. If E is missing from Variables_order's configuration, then PHP cannot accept the environment variable, then $_env is empty.

Original address: http://www.5idev.com/p-php_env.shtml

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