--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/Requests/src/Utility/InputValidator.php	Fri Sep 05 18:40:08 2025 +0200
@@ -0,0 +1,109 @@
+<?php
+/**
+ * Input validation utilities.
+ *
+ * @package Requests\Utilities
+ */
+
+namespace WpOrg\Requests\Utility;
+
+use ArrayAccess;
+use CurlHandle;
+use Traversable;
+
+/**
+ * Input validation utilities.
+ *
+ * @package Requests\Utilities
+ */
+final class InputValidator {
+
+	/**
+	 * Verify that a received input parameter is of type string or is "stringable".
+	 *
+	 * @param mixed $input Input parameter to verify.
+	 *
+	 * @return bool
+	 */
+	public static function is_string_or_stringable($input) {
+		return is_string($input) || self::is_stringable_object($input);
+	}
+
+	/**
+	 * Verify whether a received input parameter is usable as an integer array key.
+	 *
+	 * @param mixed $input Input parameter to verify.
+	 *
+	 * @return bool
+	 */
+	public static function is_numeric_array_key($input) {
+		if (is_int($input)) {
+			return true;
+		}
+
+		if (!is_string($input)) {
+			return false;
+		}
+
+		return (bool) preg_match('`^-?[0-9]+$`', $input);
+	}
+
+	/**
+	 * Verify whether a received input parameter is "stringable".
+	 *
+	 * @param mixed $input Input parameter to verify.
+	 *
+	 * @return bool
+	 */
+	public static function is_stringable_object($input) {
+		return is_object($input) && method_exists($input, '__toString');
+	}
+
+	/**
+	 * Verify whether a received input parameter is _accessible as if it were an array_.
+	 *
+	 * @param mixed $input Input parameter to verify.
+	 *
+	 * @return bool
+	 */
+	public static function has_array_access($input) {
+		return is_array($input) || $input instanceof ArrayAccess;
+	}
+
+	/**
+	 * Verify whether a received input parameter is "iterable".
+	 *
+	 * @internal The PHP native `is_iterable()` function was only introduced in PHP 7.1
+	 * and this library still supports PHP 5.6.
+	 *
+	 * @param mixed $input Input parameter to verify.
+	 *
+	 * @return bool
+	 */
+	public static function is_iterable($input) {
+		return is_array($input) || $input instanceof Traversable;
+	}
+
+	/**
+	 * Verify whether a received input parameter is a Curl handle.
+	 *
+	 * The PHP Curl extension worked with resources prior to PHP 8.0 and with
+	 * an instance of the `CurlHandle` class since PHP 8.0.
+	 * {@link https://www.php.net/manual/en/migration80.incompatible.php#migration80.incompatible.resource2object}
+	 *
+	 * @param mixed $input Input parameter to verify.
+	 *
+	 * @return bool
+	 */
+	public static function is_curl_handle($input) {
+		if (is_resource($input)) {
+			return get_resource_type($input) === 'curl';
+		}
+
+		if (is_object($input)) {
+			return $input instanceof CurlHandle;
+		}
+
+		return false;
+	}
+}