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Formatting: Add capital Eszett (ẞ → SS) to remove_accents() for German locale #11188

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apermo wants to merge 4 commits into from
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Formatting: Add capital Eszett (ẞ → SS) to remove_accents() for German locale #11188

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e479579
Formatting: Add capital Eszett (ẞ→SS) to remove_accents()
apermo Mar 6, 2026
b370485
Formatting: Update remove_accents() docblock for capital Eszett
apermo Mar 6, 2026
9d5561f
Formatting: Use TBD version tag in remove_accents() docblock
apermo Mar 6, 2026
98983d2
Add release version target.
dmsnell Mar 6, 2026
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3 changes: 3 additions & 0 deletions src/wp-includes/formatting.php
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Original file line number Diff line number Diff line change
Expand Up @@ -1566,6 +1566,7 @@ function utf8_uri_encode( $utf8_string, $length = 0, $encode_ascii_characters =
* | U+00F6 | ö | oe | Latin small letter o with diaeresis |
* | U+00DC | Ü | Ue | Latin capital letter U with diaeresis |
* | U+00FC | ü | ue | Latin small letter u with diaeresis |
* | U+1E9E | ẞ | SS | Latin capital letter sharp s |
* | U+00DF | ß | ss | Latin small letter sharp s |
*
* Danish (`da_DK`) locale:
Expand Down Expand Up @@ -1599,6 +1600,7 @@ function utf8_uri_encode( $utf8_string, $length = 0, $encode_ascii_characters =
* @since 5.7.0 Added locale support for `de_AT`.
* @since 6.0.0 Added the `$locale` parameter.
* @since 6.1.0 Added Unicode NFC encoding normalization support.
* @since 7.0.0 Added capital Eszett (U+1E9E) support for German locales.
*
* @param string $text Text that might have accent characters.
* @param string $locale Optional. The locale to use for accent removal. Some character
Expand Down Expand Up @@ -1972,6 +1974,7 @@ function remove_accents( $text, $locale = '' ) {
$chars['ö'] = 'oe';
$chars['Ü'] = 'Ue';
$chars['ü'] = 'ue';
$chars['ẞ'] = 'SS';
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$chars['ß'] = 'ss';
} elseif ( 'da_DK' === $locale ) {
$chars['Æ'] = 'Ae';
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10 changes: 10 additions & 0 deletions tests/phpunit/tests/formatting/removeAccents.php
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Expand Up @@ -108,6 +108,16 @@ public function test_remove_accents_germanic_umlauts() {
$this->assertSame( 'AeOeUeaeoeuess', remove_accents( 'ÄÖÜäöüß', 'de_DE' ) );
}

/**
* @ticket 64821
*/
public function test_remove_accents_germanic_capital_eszett() {
// U+1E9E LATIN CAPITAL LETTER SHARP S, standardized in German orthography in 2017 (DIN 5008).
$this->assertSame( 'SS', remove_accents( 'ẞ', 'de_DE' ) );
// Verify it works in context alongside the lowercase variant.
$this->assertSame( 'SSstrasse', remove_accents( 'ẞstraße', 'de_DE' ) );
}

/**
* @ticket 23907
*/
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