Title: Fatal error: Call to undefined function: array_diff_key() — HELP!
Last modified: August 20, 2016

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# Fatal error: Call to undefined function: array_diff_key() — HELP!

 *  [mziff](https://wordpress.org/support/users/mziff/)
 * (@mziff)
 * [14 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-call-to-undefined-function-array_diff_key-help/)
 * Hello! Please help! I installed a new widget (a flash gallery, dont remember 
   the exact name) and ever since I havent been able to log in to edit my website.
   the site is still up but it wont let me log in, i just keep getting this message:
 * Fatal error: Call to undefined function: array_diff_key() in /home/content/a/
   z/t/aztexpress/html/matthewziff/wp-content/plugins/flash-album-gallery/admin/
   admin.php on line 28
 * the site is my personal site: matthewziff.com
 * its hosted on a friend’s personal server but he is away so i have to wait till
   he gets back… until then, can anyone help me?
 * kthx!

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## Tags

 * [array](https://wordpress.org/support/topic-tag/array/)
 * [fatal](https://wordpress.org/support/topic-tag/fatal/)
 * [flash](https://wordpress.org/support/topic-tag/flash/)
 * [gallery](https://wordpress.org/support/topic-tag/gallery/)
 * [login](https://wordpress.org/support/topic-tag/login/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 0 replies
 * 1 participant
 * Last reply from: [mziff](https://wordpress.org/support/users/mziff/)
 * Last activity: [14 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-call-to-undefined-function-array_diff_key-help/)
 * Status: not resolved

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