Admin Blank Page with Working Front-End After Updating to WordPress 4.6

After debugging this problem, I found this error in the PHP error log located at public_html/mywebsite/wp-admin/error_log:

PHP Fatal error:  Call to undefined function wp_raise_memory_limit() in /home/example/public_html/mywebsite/wp-admin/admin.php on line 141

This function wp_raise_memory_limit() should be defined in wp-includes/functions.php but it is not defined in my case due to an unsuccessful update by WordPress.

So Solution: Do a manual update for wordpress as I did the following:

  • I downloaded the latest version of wordpress from wordpress.org
  • I replaced all files and folders of my site except wp-config.php file and wp-content folder
  • I opened my site url, it requested a database update

I pressed on update database and the problem resolved 🙂

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)