PHP 8.0中如何将已废弃的each()函数替换为foreach()？

安全阿岳

2026-8-4

PHP 8.0 废弃each()后的代码修复方案

PHP 8.0 已移除each()函数，原代码中list($orig,$values) = each($where);这一行会触发致命错误：Uncaught Error: Call to undefined function each()。以下是替换为foreach()后的完整修复代码：

public function getMetaboxConfig($type) {
    static $cache;

    if (!empty($cache[$type])) {
        return $cache[$type];
    }

    do_action("pe_theme_metabox_config_$type");

    $config =& PeGlobal::$config;
    $metaboxes = PeGlobal::$config["metaboxes"];

    $pmboxes = empty($config["metaboxes-$type"]) ? null : $config["metaboxes-$type"];

    if ($custom = apply_filters("pe_theme_metabox_$type",$pmboxes)) {
        foreach ( $custom as $key => $value ) {
            $metaboxes[$key] = $custom[$key];
            $where =& $metaboxes[$key]["where"];
            
            // 替换废弃的each()，获取数组第一个键值对
            foreach ($where as $orig => $values) {
                break; // 仅循环一次，匹配原each()的行为
            }
            
            if ($orig != $type) {
                unset($where[$orig]);
                $where[$type] = $values;
            }
        }
    }
    $cache[$type] = $metaboxes;
    return $metaboxes;
}