PHP 数组仅打印每个项目的第一个字母

发布于 2024-11-08 07:30:44 字数 381 浏览 0 评论 0原文

下面的代码仅打印每个数组项的第一个字母。这让我很困惑。

require_once 'includes/global.inc.php';
print_r($site->bookmarkTags(1));

$index = 0;
foreach ($site->bookmarkTags(1) as $tag) {
    echo $tag['$index'];
    $index = $index + 1;
}

print_r 返回：

Array ( [0] => Wallpapers [1] => Free )

循环：

WF

原文

The code below is only printing the first letter of each array item. It's got me quite baffled.

require_once 'includes/global.inc.php';
print_r($site->bookmarkTags(1));

$index = 0;
foreach ($site->bookmarkTags(1) as $tag) {
    echo $tag['$index'];
    $index = $index + 1;
}

print_r return:

Array ( [0] => Wallpapers [1] => Free )

the loop:

WF

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冬天的雪花 2024-11-15 07:30:44

尝试 echo $tag，而不是 $tag['$index']

由于您使用的是 foreach，该值已经从数组中获取，当您发布 $tag['$index'] 时，它将打印 '$ 中的字符索引的位置:)

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聚集的泪 2024-11-15 07:30:44

看来您已经尝试做 foreach 已经在做的事情...
问题是您实际上是在回显非数组的 $index 字母，因为 foreach 已经在执行您似乎期望 $index = $index+1 执行的操作：

require_once 'includes/global.inc.php';
print_r($site->bookmarkTags(1));

$index = 0;
foreach ($site->bookmarkTags(1) as $tag) {
    echo $tag; // REMOVE [$index] from $tag, because $tag isn't an array
    $index = $index + 1; // You can remove this line, because it serves no purpose
}

It seems you've attempted to do what foreach is already doing...
The problem is that you're actually echoing the $index letter of a non-array because foreach is already doing what you seem to be expecting your $index = $index+1 to do:

require_once 'includes/global.inc.php';
print_r($site->bookmarkTags(1));

$index = 0;
foreach ($site->bookmarkTags(1) as $tag) {
    echo $tag; // REMOVE [$index] from $tag, because $tag isn't an array
    $index = $index + 1; // You can remove this line, because it serves no purpose
}

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煞人兵器 2024-11-15 07:30:44

require_once 'includes/global.inc.php';

// Store the value temporarily instead of
// making a function call each time
$tags = $site->bookmarkTags(1);
foreach ($tags as $tag) {
    echo $tag;
}

这应该有效。问题可能是因为您每次迭代都进行函数调用，而不是临时存储值并对其进行循环。

require_once 'includes/global.inc.php';

// Store the value temporarily instead of
// making a function call each time
$tags = $site->bookmarkTags(1);
foreach ($tags as $tag) {
    echo $tag;
}

This should work. The issue might be because you're making a function call every iteration, versus storing the value temporarily and looping over it.

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