Proper way to detect that post_max_size was exceded in php? [duplicate]

This question already has answers here: How to gracefully handle files that exceed PHP's `post_max_size`? (6 answers) Closed 7 y开发者_开发百科ears ago.

What is the proper way to detect that post_max_size was exceded in php? It looks like I can only check for an empty $_POST array, which seems imprecise. I need to detect if a file that was uploaded was to big and produce a proper error message.

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You can't, if the value of post_max_size is exceeded, super globals will be empty.

A solution is to add in your form a $_GET variable

<form action="check.php?shouldHaveFilesInHere">

and to check if other super globals are filled or not in check.php.

http://www.php.net/manual/en/ini.core.php#ini.post-max-size

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If you want to know if the file that was uploaded is too large you should use $_FILE['error'].

http://php.net/manual/en/features.file-upload.errors.php