在 PHP 中将多维数组转换为单数组

Question

php中如何将多维数组转换为单个数组？我花了几个小时来寻找解决方案，但找不到适合我的解决方案。这是我的代码：<?php$arrContextOptions=array(    "ssl"=>array(        "verify_peer"=>false,        "verify_peer_name"=>false,        "http" => array(            "header" => "User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36"        )    ));$source_url = 'http://netsparker.com/';$html = file_get_contents($source_url,false, stream_context_create($arrContextOptions));$dom = new DOMDocument;@$dom->loadHTML($html);$links = $dom->getElementsByTagName('a');foreach ($links as $link) {    $result_url = $link->getAttribute('href');    if (!preg_match('/^https?:\/\//', $result_url)) {        $result_url = $source_url . preg_replace('/^\//', '', $result_url);    }    $array2 = array($result_url);    print_r($array2);}?>Array(    [0] => http://github.com/#start-of-content)Array(    [0] => https://help.github.com/articles/supported-browsers)Array(    [0] => https://github.com/)Array(    [0] => http://github.com/join?ref_cta=Sign+up&ref_loc=header+logged+out&ref_page=%2F&source=header-home)Array(    [0] => http://github.com/features)Array(    [0] => http://github.com/features/code-review/)Array(    [0] => http://github.com/features/project-management/)....我想把它变成：Array(    [0] => http://github.com/    [1] => http://github.com/collections    [2] => http://github.com/topics    [3] => http://github.com/explore    [4] => http://github.com/enterprise    .......) 我尝试使用 foreach、ArrayIterator、flatten 但似乎不起作用。我还尝试将 result_url 转换为数组，但也不起作用。

Answer 1

尝试将值推送到foreach循环中的单个数组中：

$array2 = [];

foreach ($links as $link) {

    $result_url = $link->getAttribute('href');

    if (!preg_match('/^https?:\/\//', $result_url)) {

        $result_url = $source_url . preg_replace('/^\//', '', $result_url);

    }

    $array2[] = $result_url;

}

print_r($array2);