wp_register_fatal_error_handler()
- Since
- 5.2.0
- Source
wp-includes/error-protection.php:81
Description
The handler will only be registered if wp_is_fatal_error_handler_enabled() returns true.
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.
Performance profile
How much work a call to wp_register_fatal_error_handler() 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
- 4–33
- Plugin surface
- None
- Called by
- 0
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 34.
Nothing here hands control to plugin code.
Nothing in core calls this; the cost is only what you spend yourself.
What it touches
- hookthird-party callbacks
apply_filters()one call below wp_register_fatal_error_handler()
What one call costs · 4 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost wp_register_fatal_error_handler() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 4–20 | wp_is_fatal_error_handler_enabled() |
wp_is_fatal_error_handler_enabled() && !defined('WP_CONTENT_DIR') | 17–23 | wp_is_fatal_error_handler_enabled(), is_callable() |
wp_is_fatal_error_handler_enabled() && defined('WP_CONTENT_DIR') | 23–33 | wp_is_fatal_error_handler_enabled(), is_readable(), is_callable() |
wp_is_fatal_error_handler_enabled() && defined('WP_CONTENT_DIR') && is_object($handler) | 26–30 | wp_is_fatal_error_handler_enabled(), is_readable() |
Across PHP versions
Compiles the same on PHP 7.4, 8.1, 8.2, 8.3, 8.4, 8.5 and 8.6-dev: 34 instructions, 4–33 executed per call, 5 branches. 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.
Uses · 2
- wp_is_fatal_error_handler_enabled()Checks whether the fatal error handler is enabled.
- WP_Fatal_Error_Handler::__construct()
Source code
function wp_register_fatal_error_handler() { if ( ! wp_is_fatal_error_handler_enabled() ) { return; } $handler = null; if ( defined( 'WP_CONTENT_DIR' ) && is_readable( WP_CONTENT_DIR . '/fatal-error-handler.php' ) ) { $handler = include WP_CONTENT_DIR . '/fatal-error-handler.php'; } if ( ! is_object( $handler ) || ! is_callable( array( $handler, 'handle' ) ) ) { $handler = new WP_Fatal_Error_Handler(); } register_shutdown_function( array( $handler, 'handle' ) );}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 7.1.0 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.