mu_dropdown_languages( string[] $lang_files = array(), string $current = '' )
- Since
- 3.0.0
- Source
wp-admin/includes/ms.php:629
Compatibility
- WordPress
- since 3.0.0
- 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
$lang_filesstring[]optional- An array of the language files. Default empty array.Default:
array() $currentstringoptional- The current language code. Default empty.Default:
''
Performance profile
How much work a call to mu_dropdown_languages() 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
- Light
- Scaling
- Scales with input
- Instructions
- 23–38
- Plugin surface
- 1 hook
- Called by
- 0
Touches nothing outside its own arguments.
The body loops, so the work grows with what you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 115.
Third-party callbacks on 'mu_dropdown_languages' run inside this call, and their cost is not bounded by anything here.
Nothing in core calls this; the cost is only what you spend yourself.
What it touches
- hookthird-party callbacks
apply_filters()called directly
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 · 2 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost mu_dropdown_languages() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
$flag !== false | 23–24 | uksort(), apply_filters() |
$flag === false | 37–38 | selected(), __(), uksort(), apply_filters() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 115 | 23–38 | 5 | |
| 8.5 | 115 | 23–38 | 5 | |
| 8.4 | 115 | 23–38 | 5 | 3 fewer instructions than PHP 8.3 |
| 8.3 | 118 | 26–41 | 5 | |
| 8.2 | 118 | 26–41 | 5 | |
| 8.1 | 118 | 26–41 | 5 | |
| 7.4 | 118 | 26–41 | 5 |
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 mu_dropdown_languages() runs, in this order:
- apply_filters( mu_dropdown_languages )filterline 666 (+37 into the body)
Filters the languages available in the dropdown.
Uses · 6
- __()Retrieves the translation of $text.
- esc_attr()Escaping for HTML attributes.
- selected()Outputs the HTML selected attribute.
- format_code_lang()Returns the language for a language code.
- esc_html()Escaping for HTML blocks.
- apply_filters()Calls the callback functions that have been added to a filter hook.
Source code
function mu_dropdown_languages( $lang_files = array(), $current = '' ) { $flag = false; $output = array(); foreach ( (array) $lang_files as $val ) { $code_lang = basename( $val, '.mo' ); if ( 'en_US' === $code_lang ) { // American English. $flag = true; $ae = __( 'American English' ); $output[ $ae ] = '<option value="' . esc_attr( $code_lang ) . '"' . selected( $current, $code_lang, false ) . '> ' . $ae . '</option>'; } elseif ( 'en_GB' === $code_lang ) { // British English. $flag = true; $be = __( 'British English' ); $output[ $be ] = '<option value="' . esc_attr( $code_lang ) . '"' . selected( $current, $code_lang, false ) . '> ' . $be . '</option>'; } else { $translated = format_code_lang( $code_lang ); $output[ $translated ] = '<option value="' . esc_attr( $code_lang ) . '"' . selected( $current, $code_lang, false ) . '> ' . esc_html( $translated ) . '</option>'; } } if ( false === $flag ) { // WordPress English. $output[] = '<option value=""' . selected( $current, '', false ) . '>' . __( 'English' ) . '</option>'; } // Order by name. uksort( $output, 'strnatcasecmp' ); /** * Filters the languages available in the dropdown. * * @since MU (3.0.0) * * @param string[] $output Array of HTML output for the dropdown. * @param string[] $lang_files Array of available language files. * @param string $current The current language code. */ $output = apply_filters( 'mu_dropdown_languages', $output, $lang_files, $current ); echo implode( "\n\t", $output );}Changelog
Introduced in 3.0.0. 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-admin/includes/ms.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.