PHP 未定义偏移量 使用"list"函数时的消息

Question

今天早上当我点击广告后时，我在我的网站上收到了此错误

我试过查看代码，但似乎没有发现任何问题

if (!function_exists('adforest_extarct_link')) {
    function adforest_extarct_link($string) {
        $arr = explode('|', $string);
        list($url, $title, $target, $rel) = $arr; /* This is line 148 */
        $rel = urldecode(adforest_themeGetExplode($rel, ':', '1'));
        $url = urldecode(adforest_themeGetExplode($url, ':', '1'));
        $title = urldecode(adforest_themeGetExplode($title, ':', '1'));
        $target = urldecode(adforest_themeGetExplode($target, ':', '1'));
        return array("url" => $url, "title" => $title, "target" => $target, "rel" => $rel);
    }

这是错误消息

未定义的偏移量：3 in/customers/7/6/1/corpersmarket.com/httpd.www/wp-content/themes/adforest/inc/theme_shortcodes/short_codes_functions.php 在第 148 行

它实际上有 3 行错误：

Notice: Undefined offset: 1 in /customers/7/6/1/corpersmarket.com/httpd.www/wp-content/themes/adforest/inc/theme_shortcodes/short_codes_functions.php on line 148 
Notice: Undefined offset: 2 in /customers/7/6/1/corpersmarket.com/httpd.www/wp-content/themes/adforest/inc/theme_shortcodes/short_codes_functions.php on line 148 
Notice: Undefined offset: 3 in /customers/7/6/1/corpersmarket.com/httpd.www/wp-content/themes/adforest/inc/theme_shortcodes/short_codes_functions.php on line 148

Answer 1

问题大致是 list (( 中 PHP 未定义偏移量的副本

然而

您的list期望至少 4 个 prameter - 但您的 $arr 数组只有 1。所以以下三个是空的。(请记住，数组从 0 开始(。因此，您的$string不包含explode函数按预期工作的|字符。

解决方法：

源语言：

    $arr = explode('|', $string);
    list($url, $title, $target, $rel) = $arr; /* This is line 148 */

成为：

    $arr = array_pad(explode('|', $string), 4, null);
    list($url, $title, $target, $rel) = $arr;

这是做什么的：

将数组填充为至少包含 4 个值;以便始终填充list值，即使它们可能仍为空。