Title: PHP 7.3 error – Regular expression needs updating?
Last modified: September 14, 2019

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# PHP 7.3 error – Regular expression needs updating?

 *  Resolved [prob](https://wordpress.org/support/users/prob/)
 * (@prob)
 * [6 years, 9 months ago](https://wordpress.org/support/topic/php-7-3-error-regular-expression-needs-updating/)
 * My googling suggests it may be a regex error, perhaps because php 7.3 PCRE (Perl
   Compatible Regular Expressions) has been updated to v2.
 * Not coming up if I revert to PHP 7.2
 * Warning: preg_match_all(): Compilation failed: invalid range in character class
   at offset 7 in /home2/hearmore/public_html/wp-content/themes/p2/inc/mentions.
   php on line 77
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fphp-7-3-error-regular-expression-needs-updating%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 10 replies - 1 through 10 (of 10 total)

 *  [Fotis Stathopoulos](https://wordpress.org/support/users/fstat/)
 * (@fstat)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/php-7-3-error-regular-expression-needs-updating/#post-11932245)
 * Hi there,
 * That theme is not being actively developed and that’s why you’re getting these
   errors when you’re running a newer version of PHP.
 * There’s an updated version of that theme that is compatible with PHP 7.3 and 
   has also more features. You can read more about it here:
 * [https://geto2.com/](https://geto2.com/)
 *  Thread Starter [prob](https://wordpress.org/support/users/prob/)
 * (@prob)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/php-7-3-error-regular-expression-needs-updating/#post-11933067)
 * Thanks. Installed new P2 theme and O2 plugin. Uninstalled any other plugins that
   might cause conflict but getting this error.
 * I have the old P2 theme still installed but not active.
 * Thoughts?
 * Warning: “continue” targeting switch is equivalent to “break”. Did you mean to
   use “continue 2”? in /home2/hearmore/public_html/wp-content/plugins/o2-master/
   o2.php on line 620
    Warning: Cannot modify header information – headers already
   sent by (output started at /home2/hearmore/public_html/wp-content/plugins/o2-
   master/o2.php:620) in /home2/hearmore/public_html/wp-admin/includes/misc.php 
   on line 1196
 *  [Fotis Stathopoulos](https://wordpress.org/support/users/fstat/)
 * (@fstat)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/php-7-3-error-regular-expression-needs-updating/#post-11934247)
 * Hi there,
 * That’s just a warning and it should not cause any issues on how the theme works.
 * Isn’t the theme working properly for you?
 *  Thread Starter [prob](https://wordpress.org/support/users/prob/)
 * (@prob)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/php-7-3-error-regular-expression-needs-updating/#post-11962305)
 * Reinstalled from scratch and more success this time.
 * [http://hearmoretunes.com/](http://hearmoretunes.com/)
 * Still not coming up with a mobile layout on mobile devices. Instead the screen
   is nearly blank. Before I delve into the CSS, is there a mobile / handheld CSS
   layout provided?
 * Also, is this theme going to be developed in the future?
 *  Moderator [James Huff](https://wordpress.org/support/users/macmanx/)
 * (@macmanx)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/php-7-3-error-regular-expression-needs-updating/#post-11964933)
 * It’s responsive, so it will adapt for mobile themes.
 * I wonder if it’s coming up blank because you have no posts or content displayed
   on the main page.
 *  [Jarret](https://wordpress.org/support/users/jarretc/)
 * (@jarretc)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/php-7-3-error-regular-expression-needs-updating/#post-11965370)
 * For some reason in your source code on line 195 there is this
 *     ```
       <style>
       		#content {
       			display: none;
       		}
       		</style>
       ```
   
 * Which is causing all of your normal content to not display on desktop/mobile 
   versions of the site. Not quite sure where that is coming from though, doesn’t
   look like its part of the Additional CSS in the Customizer.
 *  Moderator [James Huff](https://wordpress.org/support/users/macmanx/)
 * (@macmanx)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/php-7-3-error-regular-expression-needs-updating/#post-11965478)
 * Nice catch [@jarretc](https://wordpress.org/support/users/jarretc/)!
 *  Thread Starter [prob](https://wordpress.org/support/users/prob/)
 * (@prob)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/php-7-3-error-regular-expression-needs-updating/#post-11965570)
 * Weird. I dont believe I have any custom css but will check. Seems unlikely that
   a plugin is generating this css but I will disable them and see what happens.
   Is this a theme bug?
 * Note that php 7.3 still generates an error. I reverted back to 7.2. If interested
   I could force this error and share.
 * Thanks for help this far.
 *  Moderator [James Huff](https://wordpress.org/support/users/macmanx/)
 * (@macmanx)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/php-7-3-error-regular-expression-needs-updating/#post-11968595)
 * It’s coming in right before the end of the head section:
 *     ```
       <style type="text/css" id="syntaxhighlighteranchor"></style>
       <style>
       		#content {
       			display: none;
       		}
       		</style>
       </head>
       ```
   
 * So it’s not any custom CSS adding it (and I also doubt it’s related to Syntax
   Highlighter, I’m just including it because it’s the preceding line).
 * Check your copy of the theme’s header.php file, but mostly when I see things 
   injected right before the head section ends, it’s almost always a plugin.
 *  Thread Starter [prob](https://wordpress.org/support/users/prob/)
 * (@prob)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/php-7-3-error-regular-expression-needs-updating/#post-11996633)
 * Resolved by removing plugin.

Viewing 10 replies - 1 through 10 (of 10 total)

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## Tags

 * [css](https://wordpress.org/support/topic-tag/css/)
 * [handheld](https://wordpress.org/support/topic-tag/handheld/)
 * [mobile](https://wordpress.org/support/topic-tag/mobile/)
 * [php-error](https://wordpress.org/support/topic-tag/php-error/)

 * 10 replies
 * 4 participants
 * Last reply from: [prob](https://wordpress.org/support/users/prob/)
 * Last activity: [6 years, 8 months ago](https://wordpress.org/support/topic/php-7-3-error-regular-expression-needs-updating/#post-11996633)
 * Status: resolved