Make helper functions available as static function of Helpers class

composer.json

@@ -23,10 +23,7 @@
   "autoload": {
     "psr-4": {
       "Studiometa\\WPToolkit\\": "src/"
-    },
-    "files": [
-      "src/helpers.php"
-    ]
+    }
   },
   "scripts": {
     "phpcs": "phpcs",

src/Helpers.php

@@ -0,0 +1,63 @@
+<?php
+/**
+ * Helpers
+ *
+ * @package Studiometa
+ */
+
+namespace Studiometa\WPToolkit;
+
+/** Class. */
+class Helpers {
+	/**
+	 * Get an environment variable value.
+	 *
+	 * @param  string $key The variable name.
+	 * @return string
+	 */
+	public static function env( string $key ): string {
+		return env( $key );
+	}
+
+	/**
+	 * Get or set a server value.
+	 *
+	 * @param  string      $key The property name.
+	 * @param  string|null $value The value to set.
+	 * @return string|null
+	 */
+	public static function server( string $key, ?string $value = null ): ?string {
+		return server( $key, $value );
+	}
+}
+
+/**
+ * Get an environment variable value.
+ *
+ * @param  string $key The variable name.
+ * @return string
+ */
+function env( string $key ): string {
+	// phpcs:ignore
+	/** @var array<string, string> Good type. */
+	$env = $_ENV;
+	// In some environment, values are not available in the `$_ENV` variables,
+	// so we use `getenv` as a fallback to try and get the value.
+	return $env[ $key ] ?? (string) getenv( $key );
+}
+
+/**
+ * Get or set a server value.
+ *
+ * @param  string      $key The property name.
+ * @param  string|null $value The value to set.
+ * @return string|null
+ */
+function server( string $key, ?string $value = null ): ?string {
+	if ( ! is_null( $value ) ) {
+		$_SERVER[ $key ] = $value;
+	}
+
+	// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized,WordPress.Security.ValidatedSanitizedInput.MissingUnslash
+	return $_SERVER[ $key ] ?? null;
+}

tests/HelpersTest.php

@@ -0,0 +1,23 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+use Studiometa\WPToolkit\Helpers;
+
+/**
+ * Helper functions tests.
+ */
+class HelpersTest extends TestCase {
+	public function test_get_env() {
+		$_ENV['BAR'] = 'bar';
+
+		$this->assertEquals( Helpers::env( 'FOO' ), '' );
+		$this->assertEquals( Helpers::env( 'BAR' ), 'bar' );
+	}
+
+	public function test_get_server() {
+		$_SERVER['BAR'] = 'bar';
+
+		$this->assertNull( Helpers::server( 'FOO' ) );
+		$this->assertEquals( Helpers::server( 'BAR' ), 'bar' );
+	}
+}