I18N: Revert [57386] pending further investigation.

Reverts the change for fallback string lookup due to a performance regression in the bad case scenario.

See #59656.

git-svn-id: https://develop.svn.wordpress.org/trunk@57505 602fd350-edb4-49c9-b593-d223f7449a82

Author: swissspidy

src/wp-includes/l10n/class-wp-translation-file.php

@@ -203,24 +203,7 @@ public function translate( string $text ) {
 			$this->parse_file();
 		}
 
-		if ( isset( $this->entries[ $text ] ) ) {
-			return $this->entries[ $text ];
-		}
-
-		/*
-		 * Handle cases where a pluralized string is only used as a singular one.
-		 * For example, when both __( 'Product' ) and _n( 'Product', 'Products' )
-		 * are used, the entry key will have the format "ProductNULProducts".
-		 * Fall back to looking up just "Product" to support this edge case.
-		 */
-		foreach ( $this->entries as $key => $value ) {
-			if ( str_starts_with( $key, $text . "\0" ) ) {
-				$parts = explode( "\0", $value );
-				return $parts[0];
-			}
-		}
-
-		return false;
+		return $this->entries[ $text ] ?? false;
 	}
 
 	/**

tests/phpunit/tests/l10n/wpTranslationsConvert.php

@@ -199,10 +199,6 @@ public function test_simple_translation_files( string $file ) {
 		$this->assertSame( 'translation1 with context', $controller->translate_plural( array( 'plural0 with context', 'plural1 with context' ), 0, 'context', 'unittest' ) );
 		$this->assertSame( 'translation0 with context', $controller->translate_plural( array( 'plural0 with context', 'plural1 with context' ), 1, 'context', 'unittest' ) );
 		$this->assertSame( 'translation1 with context', $controller->translate_plural( array( 'plural0 with context', 'plural1 with context' ), 2, 'context', 'unittest' ) );
-
-		$this->assertSame( 'Produkt', $controller->translate( 'Product', '', 'unittest' ) );
-		$this->assertSame( 'Produkt', $controller->translate_plural( array( 'Product', 'Products' ), 1, '', 'unittest' ) );
-		$this->assertSame( 'Produkte', $controller->translate_plural( array( 'Product', 'Products' ), 2, '', 'unittest' ) );
 	}
 
 	/**