Update minimum required version in PHP. (#65301)

* Update minimum required version in PHP.

* Use a constant.

* Test plugin meta data and constant match.

* Set constant incorrectly to demonstrate failing tests.

* Use regex to extract the constant.

* Match the version in the constant and plugin meta.

Co-authored-by: peterwilsoncc <peterwilsoncc@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>

gutenberg.php

@@ -15,6 +15,8 @@
 ### BEGIN AUTO-GENERATED DEFINES
 defined( 'GUTENBERG_DEVELOPMENT_MODE' ) or define( 'GUTENBERG_DEVELOPMENT_MODE', true );
 ### END AUTO-GENERATED DEFINES
+defined( 'GUTENBERG_MINIMUM_WP_VERSION' ) or define( 'GUTENBERG_MINIMUM_WP_VERSION', '6.5' );
+
 
 gutenberg_pre_init();
 
@@ -26,7 +28,7 @@
 function gutenberg_wordpress_version_notice() {
 	echo '<div class="error"><p>';
 	/* translators: %s: Minimum required version */
-	printf( __( 'Gutenberg requires WordPress %s or later to function properly. Please upgrade WordPress before activating Gutenberg.', 'gutenberg' ), '5.9' );
+	printf( __( 'Gutenberg requires WordPress %s or later to function properly. Please upgrade WordPress before activating Gutenberg.', 'gutenberg' ), GUTENBERG_MINIMUM_WP_VERSION );
 	echo '</p></div>';
 
 	deactivate_plugins( array( 'gutenberg/gutenberg.php' ) );
@@ -67,7 +69,7 @@ function gutenberg_pre_init() {
 	// Compare against major release versions (X.Y) rather than minor (X.Y.Z)
 	// unless a minor release is the actual minimum requirement. WordPress reports
 	// X.Y for its major releases.
-	if ( version_compare( $version, '5.9', '<' ) ) {
+	if ( version_compare( $version, GUTENBERG_MINIMUM_WP_VERSION, '<' ) ) {
 		add_action( 'admin_notices', 'gutenberg_wordpress_version_notice' );
 		return;
 	}

phpunit/class-test-plugin-version-meta-test.php

@@ -0,0 +1,26 @@
+<?php
+/**
+ * Unit tests covering the version checks in the plugin file.
+ *
+ * @package Gutenberg
+ */
+class Test_PluginMetaData_Test extends WP_UnitTestCase {
+	/**
+	 * Test the minimum WordPress version check.
+	 *
+	 * Ensures the constant defined as the minimum required version of WordPress
+	 * matches the minimum version defined in the plugin header.
+	 */
+	public function test_minimum_required_wordpress_version() {
+		$file_meta = get_file_data( __DIR__ . '/../gutenberg.php', array( 'RequiresWP' => 'Requires at least' ) );
+		/*
+		 * Gutenberg.php isn't loaded in the test environment.
+		 *
+		 * Read the file directly and use regex to extract the constant.
+		 */
+		preg_match( '/GUTENBERG_MINIMUM_WP_VERSION\', \'(.*?)\'/', file_get_contents( __DIR__ . '/../gutenberg.php' ), $matches );
+		$version_in_file = $matches[1];
+
+		$this->assertSame( $file_meta['RequiresWP'], $version_in_file, 'The minimum required WordPress version does not match the plugin header.' );
+	}
+}