PHP 循环抛出通知，貌似一直报错

Question

$features[] = array("Feature 1", "Feature 2", "Feature 3", "Feature 4")

for ($i=0; $i <4 ; $i++) {
echo '<li class="list-group-item text-centre">'.  $features[i] . '</li>';

我无法解决通知：

Notice: Use of undefined constant i - assumed 'i' in /home3/..../public_html/html......com/all/stripe/index.php on line 48

Answer 1

它是 $features[] 的原因。 使用：

$features = array("Feature 1", "Feature 2", "Feature 3", "Feature 4")

$features[] 表示您将 = 之后的值传递到 $features 数组的新索引中，即 $features[0][your_array]

和

echo '<li class="list-group-item text-centre">'。 $特征[$i] 。 '</li>';

替换为

echo '<li class="list-group-item text-centre">'.  $features[$i] . '</li>';