wp_fix_server_vars()
- Since
- 3.0.0
- Source
wp-includes/load.php:34
$_SERVER variables for various setups.Compatibility
- WordPress
- since 3.0.0
- PHP
- 7.4–8.6-dev
- 6.7.7
- 6.8.8
- 6.9.7
- 7.0.4
- 7.1.0
Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.
Performance profile
How much work a call to wp_fix_server_vars() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.
- Cost class
- Trivial
- Scaling
- Constant
- Instructions
- 29–100
- Plugin surface
- None
- Called by
- 0
Touches nothing outside its own arguments.
No loop in the body: the same number of instructions runs whatever you pass in.
Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 118.
Nothing here hands control to plugin code.
Nothing in core calls this; the cost is only what you spend yourself.
What one call costs · 2 distinct outcomes
One number would be a lie: the work depends on which branch runs. These are every distinct cost wp_fix_server_vars() can have, taken from its control-flow graph on PHP 8.5.
| When | Instructions | Calls it makes |
|---|---|---|
!isset($value) | 29–88 | array_merge(), wp_populate_basic_auth_from_authorization_header() |
isset($value) | 36–100 | array_merge(), str_ends_with(), wp_populate_basic_auth_from_authorization_header() |
Across PHP versions
| PHP | Compiled | Executed | Branches | Notes |
|---|---|---|---|---|
| 8.6-dev | 118 | 29–100 | 14 | |
| 8.5 | 118 | 29–100 | 14 | |
| 8.4 | 118 | 29–100 | 14 | 9 fewer instructions than PHP 8.3 |
| 8.3 | 127 | 32–109 | 14 | |
| 8.2 | 127 | 32–109 | 14 | |
| 8.1 | 127 | 32–109 | 14 | 2 fewer instructions than PHP 7.4 |
| 7.4 | 129 | 32–111 | 14 |
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 · 3
- str_ends_with()Polyfill for `str_ends_with()` function added in PHP 8.0.
- str_contains()Polyfill for `str_contains()` function added in PHP 8.0.
- wp_populate_basic_auth_from_authorization_header()Populates the Basic Auth server details from the Authorization header.
Source code
function wp_fix_server_vars() { global $PHP_SELF; $default_server_values = array( 'SERVER_SOFTWARE' => '', 'REQUEST_URI' => '', ); $_SERVER = array_merge( $default_server_values, $_SERVER ); // Fix for IIS when running with PHP ISAPI. if ( empty( $_SERVER['REQUEST_URI'] ) || ( 'cgi-fcgi' !== PHP_SAPI && preg_match( '/^Microsoft-IIS\//', $_SERVER['SERVER_SOFTWARE'] ) ) ) { if ( isset( $_SERVER['HTTP_X_ORIGINAL_URL'] ) ) { // IIS Mod-Rewrite. $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_ORIGINAL_URL']; } elseif ( isset( $_SERVER['HTTP_X_REWRITE_URL'] ) ) { // IIS Isapi_Rewrite. $_SERVER['REQUEST_URI'] = $_SERVER['HTTP_X_REWRITE_URL']; } else { // Use ORIG_PATH_INFO if there is no PATH_INFO. if ( ! isset( $_SERVER['PATH_INFO'] ) && isset( $_SERVER['ORIG_PATH_INFO'] ) ) { $_SERVER['PATH_INFO'] = $_SERVER['ORIG_PATH_INFO']; } // Some IIS + PHP configurations put the script-name in the path-info (no need to append it twice). if ( isset( $_SERVER['PATH_INFO'] ) ) { if ( $_SERVER['PATH_INFO'] === $_SERVER['SCRIPT_NAME'] ) { $_SERVER['REQUEST_URI'] = $_SERVER['PATH_INFO']; } else { $_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . $_SERVER['PATH_INFO']; } } // Append the query string if it exists and isn't null. if ( ! empty( $_SERVER['QUERY_STRING'] ) ) { $_SERVER['REQUEST_URI'] .= '?' . $_SERVER['QUERY_STRING']; } } } // Fix for PHP as CGI hosts that set SCRIPT_FILENAME to something ending in php.cgi for all requests. if ( isset( $_SERVER['SCRIPT_FILENAME'] ) && str_ends_with( $_SERVER['SCRIPT_FILENAME'], 'php.cgi' ) ) { $_SERVER['SCRIPT_FILENAME'] = $_SERVER['PATH_TRANSLATED']; } // Fix for Dreamhost and other PHP as CGI hosts. if ( isset( $_SERVER['SCRIPT_NAME'] ) && str_contains( $_SERVER['SCRIPT_NAME'], 'php.cgi' ) ) { unset( $_SERVER['PATH_INFO'] ); } // Fix empty PHP_SELF. $PHP_SELF = $_SERVER['PHP_SELF']; if ( empty( $PHP_SELF ) ) { $_SERVER['PHP_SELF'] = preg_replace( '/(\?.*)?$/', '', $_SERVER['REQUEST_URI'] ); $PHP_SELF = $_SERVER['PHP_SELF']; } wp_populate_basic_auth_from_authorization_header();}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 6.9.7 tag, from
src/wp-includes/load.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
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