WP_Sitemaps_Renderer::check_for_simple_xml_availability()
- Since
- 5.5.0
- Source
wp-includes/sitemaps/class-wp-sitemaps-renderer.php:251
Compatibility
- WordPress
- since 5.5.0
- 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_Sitemaps_Renderer::check_for_simple_xml_availability() 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
- 1
- Plugin surface
- None
- Called by
- 2
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. The body compiles to 30.
Nothing here hands control to plugin code.
2 places in core call this, so the cost is paid more often than your own code shows.
What it touches
- hookthird-party callbacks
apply_filters()one call below WP_Sitemaps_Renderer::check_for_simple_xml_availability()
Further down the call graph this can also reach option, cache, serialize, query and transient. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.
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_Sitemaps_Renderer::check_for_simple_xml_availability() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 1 | none |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 30 | 1 | 1 | |
| 8.5 | 30 | 1 | 1 | |
| 8.4 | 30 | 1 | 1 | 2 fewer instructions than PHP 8.3 |
| 8.3 | 32 | 1 | 1 | |
| 8.2 | 32 | 1 | 1 | |
| 8.1 | 32 | 1 | 1 | 1 more instruction than PHP 7.4 |
| 7.4 | 31 | 5–31 | 1 |
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 · 4
- add_filter()Adds a callback function to a filter hook.
- wp_die()Kills WordPress execution and displays HTML page with an error message.
- esc_xml()Escaping for XML blocks.
- __()Retrieves the translation of $text.
Used by · 2
- WP_Sitemaps_Renderer::render_index()Renders a sitemap index.
- WP_Sitemaps_Renderer::render_sitemap()Renders a sitemap.
Source code
private function check_for_simple_xml_availability() { if ( ! class_exists( 'SimpleXMLElement' ) ) { add_filter( 'wp_die_handler', static function () { return '_xml_wp_die_handler'; } ); wp_die( sprintf( /* translators: %s: SimpleXML */ esc_xml( __( 'Could not generate XML sitemap due to missing %s extension' ) ), 'SimpleXML' ), esc_xml( __( 'WordPress › Error' ) ), array( 'response' => 501, // "Not implemented". ) ); } }Changelog
Introduced in 5.5.0. 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 6.7.7 tag, from
src/wp-includes/sitemaps/class-wp-sitemaps-renderer.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.