PHP: File uploads fail without any error

When handling uploads with PHP often it can happen, that the $_FILES array is simply empty. This can occur when one of the following things is true:

  1. Check php.ini for file_uploads = On, post_max_size, and upload_max_file_size. Make sure you’re editing the correct php.ini – use phpinfo() to verify your settings.
  2. Make sure your FORM tag has the enctype=”multipart/form-data” attribute.
  3. Do not use javascript to disable your form file input field on form submission!
  4. Make sure your directory has read+write permissions set for the tmp and upload directories.
  5. Make sure your FORM tag has method=”POST”. GET requests do not support multipart/form-data uploads.
  6. Make sure your file destination and tmp/upload directories do not have spaces in them.
  7. Make sure all FORMs on your page have /FORM close tags.
  8. Make sure your file input tag has a NAME attribute. An ID attribute is NOT sufficient! ID attributes are for use in the DOM, not for POST payloads.
  9. Your /tmp folder is full

Hope this helps!

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Kordian Bruck

I'm a TUM Computer Science Alumni. Pizza enthusiast. Passionate for SRE, beautiful Code and Club Mate. Currently working as an SRE at Google. Opinions and statements in this blog post are my own.

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