best way to determine if a URL is an image in PHP

by

You could use an HTTP HEAD request and check the content-type. This might be a good compromise. It can be done using PHP Streams. Wez Furlong has an article that shows how to use this approach to send post requests, but it can be easily adapted to send HEAD requests instead. You can retrieve the headers from an http response using stream_get_meta_data().

Of course this isn’t really 100%. Some servers send incorrect headers. It will however handle cases where images are delivered through a script and the correct file extension isn’t available. The only way to be really certain is to actually retrieve the image – either all of it, or the first few bytes, as suggested by thomasrutter.

More Related Contents:

  1. Check whether image exists on remote URL
  2. Website is very slow, but if I modify the URL it loads normally
  3. Turn Plain Text URLs into Active Links using PHP [closed]
  4. How can I create friendly URLs with .htaccess?
  5. PHP ini file_get_contents external url
  6. Get URL query string parameters
  7. How to get multiple parameters with same name from a URL in PHP
  8. Save image from url with curl PHP
  9. How to pass extra variables in URL with WordPress
  10. Copy Image from Remote Server Over HTTP
  11. PHP: How to check if image file exists?
  12. Get img src with PHP
  13. Super fast getimagesize in php
  14. Get title of website via link
  15. PHP Get Site URL Protocol – http vs https
  16. Add ‘Watermark’ to images with php [closed]
  17. Calculating image size ratio for resizing
  18. How to embed images in html email
  19. Get file content from URL?
  20. Proper URL forming with a query string and an anchor hashtag
  21. Manipulate a url string by adding GET parameters
  22. PHP Application URL Routing
  23. http_build_query with same name parameters
  24. How to embed images in a single HTML / PHP file?
  25. Convert tiff to jpg in php?
  26. %2F in URL breaks and does not reference to the .php file required [duplicate]
  27. Parsing URL query in PHP [duplicate]
  28. Create Image From Url Any File Type
  29. Secure User Image Upload Capabilities in PHP
  30. Get image extension

Leave a Comment