Returns all the registered configuration options.
An optional extension name. If set, the function return only options specific for that extension.
Returns an associative array uses the directive name as the array key, with elements of that array being global_value (set in php.ini), local_value (perhaps set with ini_set() or .htaccess), and access (the access level). See the manual section on configuration changes for information on what access levels mean.
Note: It's possible for a directive to have multiple access levels, which is why access shows the appropriate bitmask values.
Example 1. A ini_get_all() example
The above example will output something similar to: