PHP debugging not working

Support
,
1

In my flywheeel multisite subdirectory stagining installation, whenever I’m testing a plugin and it returns an error, it only shows ‘A critical error occurred on your site’ but without any debugging information.

I went into wp-config.php and set:
define(‘WP_DEBUG’, true);
define( ‘WP_DEBUG_LOG’, true );
define( ‘WP_DEBUG_DISPLAY’, true );
but it still shows the same error without identifying where the php error is occurring. Can anyone guide me to enable and display errors on flywheel? THanks in advance.

2

This is coming from the WSOD protection in WP5.2. You can use a constant to turn this off.

define( 'WP_DISABLE_FATAL_ERROR_HANDLER', true );

There’s a plugin, WP Debugging, that sets many of these constants for you.

3

so I added that line to wp-config.php but rather than returning “Fatal error occurred…” it just shows a blank white page. How can I get it to display the PHP error w/ line number etc.?

Thanks in advance!

4

Honestly it’s simpler to just use the WP Debugging plugin. That’s why I wrote it.

Before installing/activating the plugin you might want to remove those debugging constants from wp-config.php. They will be added correctly with the plugin settings.

The plugin also enables an easy way to review your error.log with the Debug Quick Look menu.

5

for some reason there’s no discernible difference with the plugin activated. Maybe something very spcific to my installation is suppressing it. It’s a multisite and Im using custom templates.

Thanks for the suggestion though

6

I’m happy to help troubleshoot the plugin. On multisite the settings are in the Network Admin > Tools screen.

What are the current debugging constants defined in wp-config.php?

7

so in the plugin settings it says:

## Debugging Constants

The following constants are set with plugin activation and removed with plugin deactivation.

```
define( 'WP_DEBUG', true );
```

```
define( 'WP_DEBUG_LOG', true );
```

```
define( 'SCRIPT_DEBUG', true );
```

```
define( 'SAVEQUERIES', true );
```

Select the debugging constants.

[x]Set WP_DEBUG to true.
[ ]Set WP_DEBUG_DISPLAY to false, default is true.
[ ]Set WP_DISABLE_FATAL_ERROR_HANDLER to true.
8

You will also want to check Set WP_DISABLE_FATAL_ERROR_HANDLER to true

9

Please make sure that these changes are reflected in your wp-config.php file.

10

so those changes listed above do not explicitly appear in my wp-config.php, except in the the ones I commented out before the plugin install

i.e. //define('WP_DEBUG',true);

should I copy and paste the lines from the plugin settings into wp-config.php?

11

Deactivate the plugin.
Uncomment or delete the previous debug constants in wp-config.php
Reactivate the plugin.
Re-save the Settings.
Check your wp-config.php.

12

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