(PHP 4, PHP 5, PHP 7)
ini_set — Sets the value of a configuration option
ini_set ( string $varname , string $newvalue ) : string
Sets the value of the given configuration option. The configuration option will keep this new value during the script's execution, and will be restored at the script's ending.
varname
Not all the available options can be changed using ini_set(). There is a list of all available options in the appendix.
newvalue
The new value for the option.
Returns the old value on success, false on failure.
Example #1 Setting an ini option
<?php
echo ini_get('display_errors');
if (!ini_get('display_errors')) {
ini_set('display_errors', '1');
}
echo ini_get('display_errors');
?>
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https://www.php.net/manual/en/function.ini-set.php