PHPMaster: A Tour of PHP.INI
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Anyone who has a server using PHP has undoubtedly heard of php.ini – it’s the configuration file used to control and customize PHP’s run-time behavior. It provides a simple way to configure settings for such things as: Upload Directories Log Errors Maximum Script execution time File Upload limit … and so much more. php.ini is the first file PHP looks for when starting up, because of the importance of the configuration directives it sets. However if you make changes to your php.ini , it will requires a server reboot before the changes take effect
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PHPMaster: A Tour of PHP.INI