Question

一旦满足某个条件，有没有办法阻止内爆？我在任何文档中都找不到任何内容。此代码生成的输出如下所示：

 page  --->  page  --->  $goal ---> page  --->  $goal
 page  --->  $goal ---> page ---> page

我希望它只在第一个$目标出现之前运行，然后移到下一行，所以这是最后一个这样的：

page  --->  page  --->  $goal
page  --->  $goal

这是我的代码部分与内爆。我厌倦了在回声之前坚持使用if语句，但是没有做任何事情。

$goalpage = "leadfactory.ca/analytics/goal.php";

$html = "<table>";
$html .= "<tr><th align='left'>PAGE PATHS HITTING GOAL.PHP</th></tr>";
$paths = array();
$sql = "SELECT cookie_uid, page_url FROM pageviews WHERE cookie_uid ORDER BY rowid";
$result = mysqli_query($conn, $sql);
$got_rows = mysqli_num_rows($result);

if ($got_rows) {
while ($row = mysqli_fetch_array($result)) {

// Create an array for the cookie_uid if it doesn't exist yet
if ( ! array_key_exists($row['cookie_uid'], $paths) || ! is_array($paths[$row['cookie_uid']])) {
    $paths[$row['cookie_uid']] = [];
}

// Add to the array now that we know it exists
array_push($paths[$row['cookie_uid']], $row['page_url']);
}

foreach ($paths as $session => $page) {
if ($page == $goalpage) {
    break;
}
   echo "<tr><td>" . implode('  --->   ', $page) . "</td></tr>";
}

} else {
$html .= '<td colspan="2">No results</td>' . "";
}

$html .= "</table>";
echo $html;

if (!mysqli_query($conn,$sql))  {
die('Error: ' . mysqli_error($conn));
}

Answer 1

// Your starting array
$pages = array("page","page","page","page","page","goal","page","page",);

// Get the index of the "goal" key
// see: http://php.net/manual/en/function.array-search.php
$lastkey = array_search("goal", $pages);

// Shorten your array accordingly
// see: http://php.net/manual/en/function.array-slice.php
$pages = array_slice($pages, 0, $lastkey+1);

// Implode
implode(' ---> ', $pages);

小提琴：https://3v4l.org/CIAH5

不，你不能停止＆＃34;内爆，但是在内爆之前你可以搞砸你的数组...

Answer 2

你可以这样做：

$arr[0]="page0";
$arr[1]="page1";
$arr[2]="page2";
$arr[3]="goal";
$arr[4]="page4";


echo implode(" ---> ", array_slice($arr, 0, array_search("goal",$arr)+1));

输出

page0 ---> page1 ---> page2 ---> goal

看到它的实际效果 https://3v4l.org/cFhv3

该功能将是：

function implode_with_limit($arr, $goal)
{
    return implode(" ---> ", array_slice($arr, 0, array_search($goal,$arr)+1));
}

PHP：一旦满足条件就停止Implode

2 个答案: