Why Doesn't `ini_set()` Change `upload_max_filesize`?

Changing upload_max_filesize in PHP

When attempting to modify the upload_max_filesize setting using the ini_set() function, a user encountered an unexpected result. Despite setting the value to '10M' in both their script and the php.ini configuration file, the ini_get('upload_max_filesize') call returned '2M'.

Upon restarting the Apache server, the issue resolved itself. However, to fully understand why the ini_set() call was not having the desired effect, it's important to note the following points:

• Shorthand notation not supported outside of PHP.ini: The short form 'M' used in '10M' is only recognized within the PHP.ini configuration file. When setting configuration values dynamically, it's necessary to use the full value, such as '10 Megabytes'.
• upload_max_filesize cannot be set by ini_set(): The upload_max_filesize directive is configured with the PHP_INI_PERDIR flag, indicating that it can only be set in the php.ini file. Therefore, attempting to modify it using ini_set() will not take effect.

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