WP_Scripts::get_eligible_loading_strategy( string $handle ): string
- Since
- 6.3.0
- Source
wp-includes/class-wp-scripts.php:1044
Compatibility
- WordPress
- since 6.3.0
- 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.
Parameters
$handlestring- The script handle.
Return value
string- The best eligible loading strategy.
Performance profile
How much work a call to WP_Scripts::get_eligible_loading_strategy() 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
- 8–23
- Plugin surface
- None
- 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 27.
Nothing here hands control to plugin code.
1 place in core call this, so the cost is paid more often than your own code shows.
What one call costs · 2 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost WP_Scripts::get_eligible_loading_strategy() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
| always | 8 | ->get_data() |
| always | 19–23 | ->get_data(), ->filter_eligible_strategies() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 27 | 8–23 | 4 | |
| 8.5 | 27 | 8–23 | 4 | |
| 8.4 | 27 | 8–23 | 4 | 3 fewer instructions than PHP 8.3 |
| 8.3 | 30 | 8–26 | 4 | |
| 8.2 | 30 | 8–26 | 4 | |
| 8.1 | 30 | 8–26 | 4 | |
| 7.4 | 30 | 8–26 | 4 |
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_Scripts::get_data()
- WP_Scripts::filter_eligible_strategies()Filter the list of eligible loading strategies for a script.
Used by · 1
- WP_Scripts::do_item()Processes a script dependency.
Source code
private function get_eligible_loading_strategy( $handle ) { $intended_strategy = (string) $this->get_data( $handle, 'strategy' ); // Bail early if there is no intended strategy. if ( ! $intended_strategy ) { return ''; } /* * If the intended strategy is 'defer', limit the initial list of eligible * strategies, since 'async' can fallback to 'defer', but not vice-versa. */ $initial_strategy = ( 'defer' === $intended_strategy ) ? array( 'defer' ) : null; $eligible_strategies = $this->filter_eligible_strategies( $handle, $initial_strategy ); // Return early once we know the eligible strategy is blocking. if ( empty( $eligible_strategies ) ) { return ''; } return in_array( 'async', $eligible_strategies, true ) ? 'async' : 'defer'; }Changelog
Introduced in 6.3.0. 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/class-wp-scripts.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.