Environment - max input vars: Difference between revisions
Helen Foster (talk | contribs) m (Tsala moved page admin/environment/custom check/max input vars to Environment - max input vars) |
m (Added an example of the change made in php.ini on Ubuntu.) |
||
| Line 6: | Line 6: | ||
* Grading courses with big number of participants | * Grading courses with big number of participants | ||
* Large quizzes and quiz settings | * Large quizzes and quiz settings | ||
The default value for max_input_vars in PHP is '''1000''', this is not enough for many cases. | The default value for max_input_vars in PHP is '''1000''', this is not enough for many cases. | ||
If you are using PHP 7 the recommended value for the '''max_input_vars''' in Moodle is '''5000''' but you can still use Moodle with the lower value. Moodle code has a workaround that allows to submit the forms even with bigger limit however this workaround is not perfect. It is much better to increase the setting. | If you are using PHP 7 the recommended value for the '''max_input_vars''' in Moodle is '''5000''' but you can still use Moodle with the lower value. Moodle code has a workaround that allows to submit the forms even with bigger limit however this workaround is not perfect. It is much better to increase the setting. | ||
If you are using PHP 8 the minimum value of 5000 '''is required'''. | e.g. in Ubuntu 20.x, within /etc/php/7.4/apache2/php.ini, find this section and remove the comment (semi-colon) and edit the line to increase the size: | ||
<nowiki>;</nowiki> How many GET/POST/COOKIE input variables may be accepted | |||
<nowiki>;</nowiki>max_input_vars = 1000 | |||
'''max_input_vars = 5000''' | |||
If you are using PHP 8 the minimum value of 5000 '''is required'''. By default PHP 8 sets to display startup errors (see [[https://php.watch/versions/8.0/startup-errors-enabled]]). This means that the warning about exceeding max_input_vars appears before the workaround even applied. | |||
To change max_input_vars you can either set it in php.ini or modify it in runtime, for example for Apache you can create '''.htaccess''' file: | To change max_input_vars you can either set it in php.ini or modify it in runtime, for example for Apache you can create '''.htaccess''' file: | ||
| Line 17: | Line 24: | ||
php_value max_input_vars 5000 | php_value max_input_vars 5000 | ||
</code> | </code> | ||
[[Category:Environment|PHP]] | [[Category:Environment|PHP]] | ||
[[es:admin/environment/custom check/max input vars]] | [[es:admin/environment/custom check/max input vars]] | ||
Latest revision as of 08:08, 2 December 2021
The PHP setting max_input_vars determines how many input variables may be accepted (limit is applied to $_GET, $_POST and $_COOKIE superglobal separately). If there are more input variables than specified by this directive, an E_WARNING is issued, and further input variables are truncated from the request.
There are a lot of big or potentially big forms in Moodle, such as:
- Site administration tree search
- Editing roles
- Grading courses with big number of participants
- Large quizzes and quiz settings
The default value for max_input_vars in PHP is 1000, this is not enough for many cases.
If you are using PHP 7 the recommended value for the max_input_vars in Moodle is 5000 but you can still use Moodle with the lower value. Moodle code has a workaround that allows to submit the forms even with bigger limit however this workaround is not perfect. It is much better to increase the setting.
e.g. in Ubuntu 20.x, within /etc/php/7.4/apache2/php.ini, find this section and remove the comment (semi-colon) and edit the line to increase the size:
; How many GET/POST/COOKIE input variables may be accepted
;max_input_vars = 1000
max_input_vars = 5000
If you are using PHP 8 the minimum value of 5000 is required. By default PHP 8 sets to display startup errors (see [[1]]). This means that the warning about exceeding max_input_vars appears before the workaround even applied.
To change max_input_vars you can either set it in php.ini or modify it in runtime, for example for Apache you can create .htaccess file:
php_value max_input_vars 5000
