PHP过滤1个url的数组

Question

我制作了一个脚本，该脚本创建了一个从页面中抓取的 url 数组，我想过滤该数组以获取 1 个特定的 url。 该数组当前如下所示：

Array
(
    [0] => index.jsp
    [1] => feedback.jsp
    [2] => faq.jsp
    [3] => donate.jsp
    [4] => contact.jsp
    [5] => widgetmaker.jsp
    [11] => http://www.example.com/myaccount/accountactivation?_mska_tok=tON-3yIN1n5TVrFAXT3Q&_tgt_url=http%3A%2F%2Fanothersite.com%2Fxml.php
    [12] => http://www.example.com/myaccount/accountactivation?_mska_tok=tON-3yIN1n5TVrFAXT3Q&_tgt_url=http%3A%2F%2Fanothersite.com%2Fxml.php
    [13] => http://www.example.com/myaccount/accountactivation?_mska_tok=tON-3yIN1n5TVrFAXT3Q&_tgt_url=http%3A%2F%2Fanothersite.com%2Fxml.php
    [14] => http://www.example.com/myaccount/accountactivation?_mska_tok=tON-3yIN1n5TVrFAXT3Q&_tgt_url=http%3A%2F%2Fanothersite.com%2Fxml.php
    [15] => http://www.example.com/myaccount/accountactivation?_mska_tok=tON-3yIN1n5TVrFAXT3Q&_tgt_url=http%3A%2F%2Fanothersite.com%2Fxml.php
)

我想要它做的是获取“http://www.example.com/myaccount/accountactivation?_mska_tok=tON-3yIN1n5TVrFAXT3Q&_tgt_url=http%3A%2F%2Fanothersite.com%2Fxml.php”之一链接。我该怎么做？

Answer 1

如果我理解正确，您只想获得完全限定（绝对）的 URL：

$filtered = array_filter($urls, function($url) {
    if (strpos($url, 'http://') === 0) return true;
    return false;
});

如果你想要http 和https 两个网址：

$filtered = array_filter($urls, function($url) {
    if (preg_match('#^https?://#', $url)) return true;
    return false;
});

如果您只想要完全匹配：

$filtered = array_filter($urls, function($url) {
    if ($url == 'http://full/url/goes/here') return true;
    return false;
});

如果你只想得到第一个，那么：

$url = $filtered[0];

Answer 2

我认为理想的做法是改进脚本以仅捕获一个链接。您知道最终到达网址的标准吗？

恕我直言，理想情况下，使用regular expression，或者，如果可能，使用strpos 查找特定字符串，这样更有效。

Answer 3

如果我对您的理解正确，您要么想要获取 url——如果它存在于数组中——或者NULL。这个 PHP 代码可以做到这一点：

function get_url_if_present($wanted, $array) {
     return array_keys($array, $wanted) ? $wanted : NULL;
}

...其中$wanted 是您在$array 中搜索的url，如果找到的url 存在于数组中，则返回值是一个字符串，否则为NULL。

你可以这样调用这个函数：

<?php

function get_url_if_present($wanted, $array) {
     return array_keys($array, $wanted) ? $wanted : NULL;
}

$arr = Array
(
    0 => "index.jsp",
    1 => "feedback.jsp",
    2 => "faq.jsp",
    3 => "donate.jsp",
    4 => "contact.jsp",
    5 => "widgetmaker.jsp",
    11 => "http://www.example.com/myaccount/accountactivation?_mska_tok=tON-3yIN1n5TVrFAXT3Q&_tgt_url=http%3A%2F%2Fanothersite.com%2Fxml.php",
    12 => "http://www.example.com/myaccount/accountactivation?_mska_tok=tON-3yIN1n5TVrFAXT3Q&_tgt_url=http%3A%2F%2Fanothersite.com%2Fxml.php",
    13 => "http://www.example.com/myaccount/accountactivation?_mska_tok=tON-3yIN1n5TVrFAXT3Q&_tgt_url=http%3A%2F%2Fanothersite.com%2Fxml.php",
    14 => "http://www.example.com/myaccount/accountactivation?_mska_tok=tON-3yIN1n5TVrFAXT3Q&_tgt_url=http%3A%2F%2Fanothersite.com%2Fxml.php",
    15 => "http://www.example.com/myaccount/accountactivation?_mska_tok=tON-3yIN1n5TVrFAXT3Q&_tgt_url=http%3A%2F%2Fanothersite.com%2Fxml.php"
);

$url_as_string = get_url_if_present("http://www.example.com/myaccount/accountactivation?_mska_tok=tON-3yIN1n5TVrFAXT3Q&_tgt_url=http%3A%2F%2Fanothersite.com%2Fxml.php", $arr);
print $url_as_string;

?>