Why is my $_FILES array empty in my PHP file uploads?

Troubleshooting Empty $_FILES Array in PHP File Uploads

When attempting to upload files using PHP, it's not uncommon to encounter an empty $_FILES array, leaving you wondering where your files have gone. This issue can arise for various reasons, and here's a comprehensive checklist to help you identify and resolve it:

PHP Configuration and Permissions:

• Ensure that the php.ini configuration includes the following settings:

  • file_uploads = On
  • post_max_size = 100M (or higher)
  • upload_max_filesize = 100M (or higher)
• Verify that the specified upload_tmp_dir has read/write permissions for the current user or web server.
• Make sure spaces are not present in the upload_tmp_dir path.

HTML Form:

• Confirm that your HTML form contains the enctype="multipart/form-data" attribute within the
  tag.
• Verify that your file input element has a unique and valid name attribute (avoid using the same name for multiple input fields).
• Avoid including underscores in the input's name attribute, as this can cause issues depending on the server configuration.
• Double-check that your form's method attribute is set to "POST" (not "GET").

File Restrictions:

• Ensure that non-alphanumeric characters are not present in the file's name.
• Avoid uploading files that exceed the configured file size limit (upload_max_filesize).
• Check for ample disk space on the server.

Miscellaneous Considerations:

• Confirm that your website's .htaccess file does not contain any conflicting directives that may interfere with file uploads.
• Disable JavaScript code that may be interfering with the file input field on form submission.
• Inspect your HTML structure for any overlapping or invalid tags that could impact the form behavior.
• Consider using smaller file sizes for testing purposes to rule out file-size-related issues.
• Check if AJAX POST requests are being utilized instead of regular POST requests, as this can disrupt file uploads.

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