Formatting: Add support for Enums in is_serialized().

This changeset adds support for Enums in `is_serialized()`. It also adds new unit tests for this function.

Props ayeshrajans, konradyoast, peterwilsoncc, costdev, dennisatyoast, mukesh27.
Fixes #53299.


git-svn-id: https://develop.svn.wordpress.org/trunk@53886 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/functions/isSerialized.php

@@ -0,0 +1,86 @@
+<?php
+
+/**
+ * Tests for `is_serialized()`.
+ *
+ * @ticket 53299
+ *
+ * @group functions.php
+ * @covers ::is_serialized
+ */
+class Tests_Functions_IsSerialized extends WP_UnitTestCase {
+
+	/**
+	 * Run tests on `is_serialized()`.
+	 *
+	 * @dataProvider data_is_serialized
+	 *
+	 * @param mixed $data     Data value to test.
+	 * @param bool  $expected Expected function result.
+	 */
+	public function test_is_serialized_string( $data, $expected ) {
+		$this->assertSame( $expected, is_serialized( $data ) );
+	}
+
+	/**
+	 * Data provider method for testing `is_serialized()`.
+	 *
+	 * @return array
+	 */
+	public function data_is_serialized() {
+		return array(
+			'an array'                             => array(
+				'data'     => array(),
+				'expected' => false,
+			),
+			'an object'                            => array(
+				'data'     => new stdClass(),
+				'expected' => false,
+			),
+			'a boolean false'                      => array(
+				'data'     => false,
+				'expected' => false,
+			),
+			'a boolean true'                       => array(
+				'data'     => true,
+				'expected' => false,
+			),
+			'an integer 0'                         => array(
+				'data'     => 0,
+				'expected' => false,
+			),
+			'an integer 1'                         => array(
+				'data'     => 1,
+				'expected' => false,
+			),
+			'a float 0.0'                          => array(
+				'data'     => 0.0,
+				'expected' => false,
+			),
+			'a float 1.0'                          => array(
+				'data'     => 1.0,
+				'expected' => false,
+			),
+			'string that is too short'             => array(
+				'data'     => 's:3',
+				'expected' => false,
+			),
+			'not a colon in second position'       => array(
+				'data'     => 's!3:"foo";',
+				'expected' => false,
+			),
+			'no trailing semicolon (strict check)' => array(
+				'data'     => 's:3:"foo"',
+				'expected' => false,
+			),
+			'valid serialized null'                => array(
+				'data'     => 'N;',
+				'expected' => true,
+			),
+			'valid serialized Enum'                => array(
+				'data'     => 'E:7:"Foo:bar";',
+				'expected' => true,
+			),
+		);
+	}
+}