<?php function jetpack_require_lib( $slug ) { if ( !preg_match( '|^[a-z0-9/_.-]+$|i', $slug ) ) { trigger_error( "Cannot load a library with invalid slug $slug.", E_USER_ERROR ); return; } $basename = basename( $slug ); if ( defined( 'ABSPATH' ) && ! defined( 'WP_CONTENT_DIR' ) ) { define( 'WP_CONTENT_DIR', ABSPATH . 'wp-content' ); // no trailing slash, full paths only - WP_CONTENT_URL is defined further down } $lib_dir = WP_CONTENT_DIR . '/lib'; /** * Filter the location of the library directory. * * @since 2.5.0 * * @param str $lib_dir Path to the library directory. */ $lib_dir = apply_filters( 'jetpack_require_lib_dir', $lib_dir ); $choices = array( "$lib_dir/$slug.php", "$lib_dir/$slug/0-load.php", "$lib_dir/$slug/$basename.php", ); foreach( $choices as $file_name ) { if ( is_readable( $file_name ) ) { require_once $file_name; return; } } trigger_error( "Cannot find a library with slug $slug.", E_USER_ERROR ); }