[wp-trac] [WordPress Trac] #62047: check if ini_set is available to prevent Fatal Errors

[WordPress Trac]

#62047: check if ini_set is available to prevent Fatal Errors
--------------------------+-----------------------------
 Reporter:  maltfield     |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
--------------------------+-----------------------------
 There is a bug in wordpress that prevents users from logging-in if their
 PHP server was hardened following common best-practices

 ```
 ini_set( 'display_errors', 1 );

 ```

 This line causes a PHP Fatal error on hardened systems with the `ini_set`
 function disabled.

 ```
 PHP Fatal error:  Uncaught Error: Call to undefined function ini_set() in
 /mnt/hetznerVol3/high_priority/www/html/wordpress/htdocs/wp-
 includes/load.php:600
 ```

 # Why this matters

 For security reasons, orgs frequently configure `php.ini` to be hardened
 by adding many dangerous functions to the `disable_functions` variable in
 the `php.ini` file. For example, it's common to disable the 'exec'
 function

 ```
 disable_functions = exec
 ```

 Of course, if a php script could modify the php configuration, then it
 would defeat any hardening done by setting `disable_functions`. As such,
 it's common to add `ini_set` to the `disable_functions`

 ```
 disable_functions = exec, ini_set
 ```

 # Solution

 To fix the PHP Fatal error, wordpres should always check to see if the
 `ini_set` function exists before attempting to call it

 ```
 if( function_exists( 'ini_set') ){
    ini_set( 'display_errors', 1 );
 }
 ```

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/62047>
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