WP_Styles::_css_href( string $src, string|false|null $ver, string $handle ): string
- Since
- 2.6.0
- Source
wp-includes/class-wp-styles.php:405
Compatibility
- WordPress
- since 2.6.0
- 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
$srcstring- The source of the enqueued style.
$verstring|false|null- The version of the enqueued style.
$handlestring- The style's registered handle.
Return value
string- Style's fully-qualified URL.
Performance profile
How much work a call to WP_Styles::_css_href() 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
- 28–74
- 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 82.
Third-party callbacks on 'style_loader_src' 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 · 2 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost WP_Styles::_css_href() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
$ver_to_add === "" | 28–64 | apply_filters(), esc_url() |
$ver_to_add !== "" | 44–74 | rawurlencode(), apply_filters(), esc_url() |
This body has more branch combinations than are worth enumerating, so the table covers the outcomes found first rather than every one that exists.
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 82 | 28–74 | 17 | |
| 8.5 | 82 | 28–74 | 17 | |
| 8.4 | 82 | 28–74 | 17 | 19 fewer instructions than PHP 8.3 |
| 8.3 | 101 | 28–93 | 17 | |
| 8.2 | 101 | 28–93 | 17 | |
| 8.1 | 101 | 28–93 | 17 | 3 fewer instructions than PHP 7.4 |
| 7.4 | 104 | 30–96 | 17 |
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_Styles::_css_href() runs, in this order:
- apply_filters( style_loader_src )filterline 445 (+40 into the body)
Filters an enqueued style's fully-qualified URL.
Uses · 4
- str_starts_with()Polyfill for `str_starts_with()` function added in PHP 8.0.
- str_contains()Polyfill for `str_contains()` function added in PHP 8.0.
- apply_filters()Calls the callback functions that have been added to a filter hook.
- esc_url()Checks and cleans a URL.
Used by · 1
- WP_Styles::do_item()Processes a style dependency.
Source code
public function _css_href( $src, $ver, $handle ) { if ( ! is_bool( $src ) && ! preg_match( '|^(https?:)?//|', $src ) && ! ( $this->content_url && str_starts_with( $src, $this->content_url ) ) ) { $src = $this->base_url . $src; } $ver_to_add = ''; if ( empty( $ver ) && null !== $ver && is_string( $this->default_version ) ) { $ver_to_add = $this->default_version; } elseif ( is_scalar( $ver ) ) { $ver_to_add = (string) $ver; } $added_args = (string) ( $this->args[ $handle ] ?? '' ); if ( '' !== $ver_to_add || '' !== $added_args ) { $fragment = strstr( $src, '#' ); if ( false !== $fragment ) { $src = substr( $src, 0, -strlen( $fragment ) ); } if ( '' !== $ver_to_add ) { $src .= ( str_contains( $src, '?' ) ? '&' : '?' ) . 'ver=' . rawurlencode( $ver_to_add ); } if ( '' !== $added_args ) { $src .= ( str_contains( $src, '?' ) ? '&' : '?' ) . $added_args; } if ( false !== $fragment ) { $src .= $fragment; } } /** * Filters an enqueued style's fully-qualified URL. * * @since 2.6.0 * * @param string $src The source URL of the enqueued style. * @param string $handle The style's registered handle. */ $src = apply_filters( 'style_loader_src', $src, $handle ); return esc_url( $src ); }Changelog
Introduced in 2.6.0. One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
$ver retyped from string to string|false|null.verified against sourceAbout this page
- Parsed data
- Generated from the wordpress-develop 7.0.4 tag, from
src/wp-includes/class-wp-styles.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
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