Date/Time: Pass the weekday number to WP_Locale::get_weekday() as an int in wp_date().

`DateTimeInterface::format( 'w' )` returns a string from `'0'` to `'6'`, which
worked only because the string was coerced to an integer array key. Casting it
to an int matches the `int<0, 6>` parameter type and removes the last
`get_weekday()` entry from the `argument.type` PHPStan baseline.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: westonruter

src/wp-includes/functions.php

@@ -269,7 +269,7 @@ function wp_date( $format, $timestamp = null, $timezone = null ) {
 		$new_format    = '';
 		$format_length = strlen( $format );
 		$month         = $wp_locale->get_month( $datetime->format( 'm' ) );
-		$weekday       = $wp_locale->get_weekday( $datetime->format( 'w' ) );
+		$weekday       = $wp_locale->get_weekday( (int) $datetime->format( 'w' ) );
 
 		for ( $i = 0; $i < $format_length; $i++ ) {
 			switch ( $format[ $i ] ) {

tests/phpstan/baselines/argument.type.neon

@@ -903,11 +903,6 @@ parameters:
 			identifier: argument.type
 			count: 2
 			path: ../../../src/wp-includes/functions.php
-		-
-			message: '#^Parameter \#1 \$weekday_number of method WP_Locale\:\:get_weekday\(\) expects int\<0, 6\>, ''0''\|''1''\|''2''\|''3''\|''4''\|''5''\|''6'' given\.$#'
-			identifier: argument.type
-			count: 1
-			path: ../../../src/wp-includes/functions.php
 		-
 			message: '#^Parameter \#2 \$fallback_url of function wp_validate_redirect expects string, false given\.$#'
 			identifier: argument.type