Introduction to several functions in PHP to get and operate the configuration file php. ini

What if you cannot modify the php. ini configuration file? it's okay. php has a set of functions for setting and retrieving configuration information. 1. ini_get () gets the configuration parameters, and ini_set () sets the configuration parameters.

The code is as follows:

Echo ini_get ('display _ errors '); // 1
// Modify the configuration information of php. ini dynamically, and the script becomes invalid after execution.
Ini_set ('display _ errors ', 0 );
Echo ini_get ('display _ errors '); // 0

2. ini_get_all () get all configuration information

The code is as follows:

// Print all configuration information...
Print_r (ini_get_all ());

3. ini_restore () resumes configuration information to the original value.

The code is as follows:

Echo ini_get ('display _ errors '); // 1
// Modify the configuration information of php. ini dynamically, and the script becomes invalid after execution.
Ini_set ('display _ errors ', 0 );
Ini_restore ('display _ errors ');
Echo ini_get ('display _ errors '); // 1