We can't change all the configured settings of php.ini file. PHP will permit to change some data by using ini_set function. We will verify after changing the configured data by using ini_get function. Here is the code. Please note the outputs shown here will change based on your server settings when you try.
We can change some of the configuration options by using ini_set() during the script execution. We can’t change permanently the setting by using ini_set(). Values will return to original value once the script execution is over.