What are the potential reasons for not receiving any information in $_FILES after attempting a file upload in PHP?

If you are not receiving any information in $_FILES after attempting a file upload in PHP, it could be due to several reasons such as exceeding the maximum file size limit, not setting the enctype attribute in the form to "multipart/form-data", or the file being larger than the post_max_size or upload_max_filesize directives in php.ini. To solve this issue, make sure to check these settings and adjust them accordingly. 

<form action="upload.php" method="post" enctype="multipart/form-data">
    <input type="file" name="file">
    <input type="submit" value="Upload">
</form>

Keywords

$_FILES file upload PHP enctype max_file_size

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