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Editing: class-redux-autoloader.php

<?php
/**
 * Register an autoloader for custom mu-plugins.
 *
 * @package redux-framework
 */

/**
 * Class Autoloader
 *
 * @package altis/core
 */
class Redux_Autoloader {
	const NS_SEPARATOR = '\\';

/**
	 * Prefix to validate against.
	 *
	 * @var string
	 */
	protected string $prefix;

/**
	 * String length of the prefix.
	 *
	 * @var int
	 */
	protected int $prefix_length;

/**
	 * Path to validate.
	 *
	 * @var string
	 */
	protected string $path;

/**
	 * Autoloader constructor.
	 *
	 * @param string $prefix Prefix to validate against.
	 * @param string $path Path to validate.
	 */
	public function __construct( string $prefix, string $path ) {
		$this->prefix        = $prefix;
		$this->prefix_length = strlen( $prefix );
		$this->path          = trailingslashit( $path );
	}

/**
	 * Load a class file if it matches our criteria.
	 *
	 * @param string $classname Class to test and/or load.
	 */
	public function load( string $classname ) {
		if ( strpos( $classname, 'Redux' ) === false ) {
			return;
		}

// Strip prefix from the start (ala PSR-4).
		$classname = substr( $classname, $this->prefix_length + 1 );
		if ( function_exists( 'mb_strtolower' ) && function_exists( 'mb_detect_encoding' ) ) {
			$classname = mb_strtolower( $classname, mb_detect_encoding( $classname ) );
		} else {
			$classname = strtolower( $classname );
		}

$file = '';
		// Split on namespace separator.
		$last_ns_pos = strripos( $classname, self::NS_SEPARATOR );
		if ( false !== $last_ns_pos ) {
			$namespace = substr( $classname, 0, $last_ns_pos );
			$classname = substr( $classname, $last_ns_pos + 1 );
			$file      = str_replace( self::NS_SEPARATOR, DIRECTORY_SEPARATOR, $namespace ) . DIRECTORY_SEPARATOR;
		}
		$file_prefix = $file;
		$file        = $file_prefix . 'class-' . str_replace( '_', '-', $classname ) . '.php';

$path = $this->path . $file;

if ( file_exists( $path ) ) {
			require_once $path;
		} else {
			$file = $file_prefix . 'class-redux-' . str_replace( '_', '-', $classname ) . '.php';
			$path = $this->path . $file;

if ( file_exists( $path ) ) {
				require_once $path;
			}
		}
	}
}