After upgrading to Colorbox 7.x-2.17, we encountered a 500 server error on a site running PHP 5.3. This was tracked down to the line
if (empty(variable_get('colorbox_dompurify_hide_warning', 0))) { on line 71 of colorbox.install , which was introduced as part of the fix for
https://www.drupal.org/project/colorbox/issues/3262686 →
.
PHP versions 5.3/5.4/5.5 are still technically supported for Drupal 7 → despite being EOL and unsupported by PHP, and the nature of this error means it is not possible to access any pages of the website (even those that do not use Colorbox).
While it would be best for those affected to upgrade to a newer version of PHP, that is not always an option. In such cases the only solution is to downgrade Colorbox to 7.x-2.16 and go without the fixes, or to edit the install file to assign variable_get('colorbox_dompurify_hide_warning', 0) to a variable before using if (empty()) on the variable.
Fixed
2.17
Code
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Issue #3279001 by kewesley, fibie, jeffschuler: Colorbox 7.x-2.17 causes...
Automatically closed - issue fixed for 2 weeks with no activity.