wp_is_fatal_error_handler_enabled(): bool
- Since
- 5.2.0
- Source
wp-includes/error-protection.php:108
Description
A constant WP_DISABLE_FATAL_ERROR_HANDLER can be set in wp-config.php to disable it, or alternatively the 'wp_fatal_error_handler_enabled' filter can be used to modify the return value.
Compatibility
- WordPress
- since 5.2.0
- PHP
- 7.4–8.6-dev
- 6.7.7
- 6.8.8
- 6.9.7
- 7.0.4
- 7.1.0
Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.
Return value
bool- True if the fatal error handler is enabled, false otherwise.
Performance profile
How much work a call to wp_is_fatal_error_handler_enabled() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Trivial
- Scaling
- Constant
- Instructions
- 9–11
- Plugin surface
- 1 hook
- Called by
- 1
Touches nothing outside its own arguments.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 11.
Third-party callbacks on 'wp_fatal_error_handler_enabled' run inside this call, and their cost is not bounded by anything here.
1 place in core call this, so the cost is paid more often than your own code shows.
What it touches
- hookthird-party callbacks
apply_filters()called directly
What one call costs · 1 distinct outcome
One number would be a lie: the work depends on which branch runs. These are every distinct cost wp_is_fatal_error_handler_enabled() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 9–11 | apply_filters() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 11 instructions, 9–11 executed per call, 1 branch. The work does not change between versions.
An instruction is not a fixed amount of time, so a matching count is not necessarily the same speed; what it rules out is a difference in the work itself.
Hooks and filters fired · 1
One hook fires while wp_is_fatal_error_handler_enabled() runs, in this order:
- apply_filters( wp_fatal_error_handler_enabled )filterline 139 (+31 into the body)
Filters whether the fatal error handler is enabled.
Uses · 1
- apply_filters()Calls the callback functions that have been added to a filter hook.
Used by · 1
- wp_register_fatal_error_handler()Registers the shutdown handler for fatal errors.
Source code
function wp_is_fatal_error_handler_enabled() { $enabled = ! defined( 'WP_DISABLE_FATAL_ERROR_HANDLER' ) || ! WP_DISABLE_FATAL_ERROR_HANDLER; /** * Filters whether the fatal error handler is enabled. * * **Important:** This filter runs before it can be used by plugins. It cannot * be used by plugins, mu-plugins, or themes. To use this filter you must define * a `$wp_filter` global before WordPress loads, usually in `wp-config.php`. * * Example: * * $GLOBALS['wp_filter'] = array( * 'wp_fatal_error_handler_enabled' => array( * 10 => array( * array( * 'accepted_args' => 0, * 'function' => function() { * return false; * }, * ), * ), * ), * ); * * Alternatively you can use the `WP_DISABLE_FATAL_ERROR_HANDLER` constant. * * @since 5.2.0 * * @param bool $enabled True if the fatal error handler is enabled, false otherwise. */ return apply_filters( 'wp_fatal_error_handler_enabled', $enabled );}Changelog
Introduced in 5.2.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
About this page
- Parsed data
- Generated from the wordpress-develop 7.0.4 tag, from
src/wp-includes/error-protection.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
- Something wrong on this page? Report it and it gets fixed in the next regeneration.