Title: Fatal error: Uncaught Error: Call to undefined function mysql_error
Last modified: August 31, 2016
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# Fatal error: Uncaught Error: Call to undefined function mysql_error
* [Aponazz](https://wordpress.org/support/users/aponazz/)
* (@aponazz)
* [10 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-uncaught-error-call-to-undefined-function-mysql_error/)
* Hi. I have a problem with a plugin. When I install it, pulls this error:
* Fatal error: Uncaught Error: Call to undefined function mysql_error() in /Applications/
MAMP/htdocs/wordpress/wp-content/plugins/revslider/inc_php/framework/db.class.
php:29 Stack trace: #0 /Applications/MAMP/htdocs/wordpress/wp-content/plugins/
revslider/inc_php/framework/db.class.php(127): UniteDBRev->checkForErrors(‘fetch’)#
1 /Applications/MAMP/htdocs/wordpress/wp-content/plugins/revslider/inc_php/revslider_params.
class.php(42): UniteDBRev->fetch(‘wp_crear_revsli…’) #2 /Applications/MAMP/htdocs/
wordpress/wp-content/plugins/revslider/inc_php/revslider_operations.class.php(
1275): RevSliderParams->getFieldFromDB(‘general’) #3 /Applications/MAMP/htdocs/
wordpress/wp-content/plugins/revslider/settings/general_settings.php(52): RevOperations::
getGeneralSettingsValues() #4 /Applications/MAMP/htdocs/wordpress/wp-content/
plugins/revslider/inc_php/framework/base_admin.class.php(346): require(‘/Applications/
M…’) #5 /Applications/MAMP/htdocs/wordpress/wp-content/plugins/revslider/revslider_admin.
php(58): UniteBaseAdminClassRev::r in /Applications/MAMP/htdocs/wordpress/wp-
content/plugins/revslider/inc_php/framework/db.class.php on line 29
* What can I do? I´m new in this. The plugins come with the theme OMNI.
Thanks!
Viewing 11 replies - 1 through 11 (of 11 total)
* [LuzAr](https://wordpress.org/support/users/luzar/)
* (@luzar)
* [10 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-uncaught-error-call-to-undefined-function-mysql_error/#post-7000962)
* I have same issue after creating a backup using duplicator and restoring it on
my local machine
* Thread Starter [Aponazz](https://wordpress.org/support/users/aponazz/)
* (@aponazz)
* [10 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-uncaught-error-call-to-undefined-function-mysql_error/#post-7000975)
* Hi! untill now I could not fix it. Some guy gave me this link with a possible
solution, but do not worked for me.
* Look: [http://stackoverflow.com/questions/8225198/phpmyadmin-the-mysql-extension-is-missing/8225474#8225474](http://stackoverflow.com/questions/8225198/phpmyadmin-the-mysql-extension-is-missing/8225474#8225474)
* I hope it works for you!
* [andreasalptun](https://wordpress.org/support/users/andreasalptun/)
* (@andreasalptun)
* [10 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-uncaught-error-call-to-undefined-function-mysql_error/#post-7001026)
* Hi Guys!
* I had the same problem. According to the mysql specs the function `mysql_error`
was deprecated in PHP 5.5 and removed in PHP 7.0.
* See: [mysql_error](https://dev.mysql.com/doc/apis-php/en/apis-php-function.mysql-error.html)
* It’s the revslider plugin that doesn’t conform to the latest API.
* I am using one.com and was able to downgrade PHP to version 5.6 in the control
panel.
* Problem solved!
* Thread Starter [Aponazz](https://wordpress.org/support/users/aponazz/)
* (@aponazz)
* [10 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-uncaught-error-call-to-undefined-function-mysql_error/#post-7001032)
* Hi! thanks for the answer.
So, if I use the version 5.6 of PHP, this should
work.
* I will try and I will tell you what happened.
* Thanks you!
* [oldcode](https://wordpress.org/support/users/coconutcoder/)
* (@coconutcoder)
* [10 years ago](https://wordpress.org/support/topic/fatal-error-uncaught-error-call-to-undefined-function-mysql_error/#post-7001069)
* Downgrading from php 7 to a 5.x version as a fix? Hmmm…there must be a better
way.
* [Stringman](https://wordpress.org/support/users/banjohead/)
* (@banjohead)
* [9 years, 11 months ago](https://wordpress.org/support/topic/fatal-error-uncaught-error-call-to-undefined-function-mysql_error/#post-7001071)
* My understanding is that updating to the latest version of the Slider Revolution
plugin corrects the incompatibility with PHP 7. I haven’t tried it yet, but will
let report back on what I find out after testing it. Another possible solution
is to alter the plugin code so that it checks whether the function exists before
calling it, as described here: [https://premium.wpmudev.org/forums/topic/revolution-slider-network-activate-failed](https://premium.wpmudev.org/forums/topic/revolution-slider-network-activate-failed)
* [phongcach](https://wordpress.org/support/users/phongcach/)
* (@phongcach)
* [9 years, 7 months ago](https://wordpress.org/support/topic/fatal-error-uncaught-error-call-to-undefined-function-mysql_error/#post-8353295)
* mysql_error was removed from PHP7.0.0 so best way is change to mysqli_error
* [iannerney](https://wordpress.org/support/users/iannerney/)
* (@iannerney)
* [9 years, 5 months ago](https://wordpress.org/support/topic/fatal-error-uncaught-error-call-to-undefined-function-mysql_error/#post-8573456)
* Here’s a quick fix that worked for me…
* Change line 29 of db.class.php from:
if(mysql_error()){
* to:
* if(mysqli_error()){
- This reply was modified 9 years, 5 months ago by [iannerney](https://wordpress.org/support/users/iannerney/).
* [gbengalex](https://wordpress.org/support/users/gbengalex/)
* (@gbengalex)
* [9 years, 5 months ago](https://wordpress.org/support/topic/fatal-error-uncaught-error-call-to-undefined-function-mysql_error/#post-8579487)
* please where is db.class.php?
* [ccgauvin94](https://wordpress.org/support/users/ccgauvin94/)
* (@ccgauvin94)
* [9 years, 5 months ago](https://wordpress.org/support/topic/fatal-error-uncaught-error-call-to-undefined-function-mysql_error/#post-8624524)
* If you’re still looking, it’s in /wp-content/plugins/revslider/inc_php/framework/
* [Almazka](https://wordpress.org/support/users/almazka/)
* (@almazka)
* [9 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-uncaught-error-call-to-undefined-function-mysql_error/#post-8667705)
* To solve above error, please open file revslider/inc_php/framework/db.class.php
and go to line no 29.
* You need to replace this code
* ```
if(mysql_error()){
$query = $this->wpdb->last_query;
$message = $this->wpdb->last_error;
if($prefix) $message = $prefix.' - '.$message.'';
if($query) $message .= '
---
Query: ' . $query;
$this->throwError($message);
}
```
* with this one
* ```
private function checkForErrors($prefix = ""){
global $wpdb;
if($wpdb->last_error !== ''){
$query = $wpdb->last_query;
$message = $wpdb->last_error;
if($prefix) $message = $prefix.' - '.$message.'';
if($query) $message .= '
---
Query: ' . esc_attr($query);
$this->throwError($message);
}
}
```
Viewing 11 replies - 1 through 11 (of 11 total)
The topic ‘Fatal error: Uncaught Error: Call to undefined function mysql_error’
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## Tags
* [fatal error](https://wordpress.org/support/topic-tag/fatal-error/)
* [MySQL](https://wordpress.org/support/topic-tag/mysql/)
* [revslider](https://wordpress.org/support/topic-tag/revslider/)
* [undefined function](https://wordpress.org/support/topic-tag/undefined-function/)
* 11 replies
* 10 participants
* Last reply from: [Almazka](https://wordpress.org/support/users/almazka/)
* Last activity: [9 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-uncaught-error-call-to-undefined-function-mysql_error/#post-8667705)
* Status: not resolved
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