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[TASK] Try to read HTTP_ACCEPT_LANGUAGE, if present. Allow for ISO. A… #6842

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[TASK] Try to read HTTP_ACCEPT_LANGUAGE, if present. Allow for ISO. A… #6842

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[TASK] Try to read HTTP_ACCEPT_LANGUAGE, if present. Allow for ISO. A…
Jun 17, 2024
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[TASK] Try to read HTTP_ACCEPT_LANGUAGE, if present. Allow for ISO. A…
Jun 17, 2024
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12 changes: 12 additions & 0 deletions src/wp-includes/load.php
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Original file line number Diff line number Diff line change
Expand Up @@ -1532,6 +1532,18 @@ function wp_load_translations_early() {
$locales[] = $wp_local_package;
}

// Try the browser's locale
// Developer note: This global variable is not present in commandline such as WP-CLI or php
if ( isset( $_SERVER['HTTP_ACCEPT_LANGUAGE'] ) ) {
// Test for regular presence, ignore wildcard https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Language
// ISO country is always 2 characters (lowercase)
// followed by minus (-) sign
// followed by mixed set of as many of minus (-) sign and a-z (uppercase)
if ( preg_match( '#[a-z]{2}-[A-Z-]+#', trim( $_SERVER['HTTP_ACCEPT_LANGUAGE'] ), $matches ) ) {
$locales[] = str_replace( '-', '_', $matches[0] );
}
}

if ( ! $locales ) {
break;
}
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