Code Modernization: Use array_all() where appropriate.

This commit replaces several `foreach` loops that iterate an array, return `false` as soon as an element fails a condition, and otherwise fall through to `true`. That is exactly what PHP 8.4's `array_all()` expresses in a single, more readable call.

WordPress core includes a polyfill for `array_all()` on PHP < 8.4 as of WordPress 6.8, so the change works on every supported PHP version without raising the minimum requirement.

Follow-up to [59783], [62550].

Props Soean, mukesh27, westonruter, SergeyBiryukov.
See #65519.

git-svn-id: https://develop.svn.wordpress.org/trunk@62553 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-includes/class-wp-user.php

@@ -827,13 +827,7 @@ public function has_cap( $cap, ...$args ) {
 		unset( $capabilities['do_not_allow'] );
 
 		// Must have ALL requested caps.
-		foreach ( (array) $caps as $cap ) {
-			if ( empty( $capabilities[ $cap ] ) ) {
-				return false;
-			}
-		}
-
-		return true;
+		return array_all( (array) $caps, fn( $cap, $key ) => ! empty( $capabilities[ $cap ] ) );
 	}
 
 	/**

src/wp-includes/functions.php

@@ -5318,13 +5318,7 @@ function wp_is_numeric_array( $data ): bool {
 		return false;
 	}
 
-	foreach ( $data as $key => $value ) {
-		if ( is_string( $key ) ) {
-			return false;
-		}
-	}
-
-	return true;
+	return array_all( $data, fn( $value, $key ) => ! is_string( $key ) );
 }
 
 /**

src/wp-includes/rest-api.php

@@ -2095,13 +2095,10 @@ function rest_are_values_equal( $value1, $value2 ) {
 			return false;
 		}
 
-		foreach ( $value1 as $index => $value ) {
-			if ( ! array_key_exists( $index, $value2 ) || ! rest_are_values_equal( $value, $value2[ $index ] ) ) {
-				return false;
-			}
-		}
-
-		return true;
+		return array_all(
+			$value1,
+			fn( $value, $index ) => array_key_exists( $index, $value2 ) && rest_are_values_equal( $value, $value2[ $index ] )
+		);
 	}
 
 	if ( is_int( $value1 ) && is_float( $value2 )