<?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 );
$lib_dir = WP_CONTENT_DIR . '/lib';
$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 );
}