How does PHP use phpinfo() to obtain PHP configuration information? (code example)

PHP provides us with a built-in function phpinfo(), which can provide detailed information about the PHP version and PHP configuration installed in the system. So how to use phpinfo() function? The following article will show you how to use the phpinfo() function. I hope it will be helpful to you.

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phpinfo() function

The phpinfo() function will output information about PHP configuration.

Basic syntax:

phpinfo ([ int $what = INFO_ALL ] )

Parameters:

$what is an omitted parameter, but $what is omitted , all configuration information will be output.

It can have the following values:

● INFO_GENERAL: Information overview, used to display configuration lines, php.ini location, build date, web server, system, etc.

● INFO_CREDITS: used to display PHP Credits.

● INFO_CONFIGURATION: Information configuration, used to display the current value, local value and main value of PHP instructions.

● INFO_MODULES: Information module, used to display loaded modules and their respective settings.

● INFO_ENVIRONMENT: Information environment, used to display environment variable information.

● INFO_VARIABLES: Information variables, which displays all predefined variables from EGPCS (environment, GET, POST, Cookie, server).

● INFO_LICENSE: Information license, used to display PHP license information.

● INFO_ALL: All information, display all the above information.

Return type: The phpinfo() function returns a Boolean value. That is, it returns true on success and false on failure.

How to display PHP configuration information?

1. Complete configuration information

To display complete information about PHP version, configuration, environment details, etc., the phpinfo() function should be executed as follows:

<?php 
phpinfo(); 
?>

Output:

Note: When using CLI mode, phpinfo() outputs plain text instead of HTML.

2. Display specific information

If you want to display specific configuration information in PHP, just add the $what parameter:

<?php 
//PHP许可证信息
phpinfo(INFO_LICENSE); 
?>

Output:

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