如何使用 PHP 从 iframe 获取 url

您可以使用正则表达式和preg_match函数

preg_match('/src="([^"]+)"/', $iframe_string, $match);
$url = $match[1];

UPDATE 如果您有使用php生成的页面或在php文件中作为内联html生成的页面，则可以使用缓冲区从php中获取html，然后在其上使用正则表达式：

首先在页面代码的开头使用，或者如果您在php之前有一些html，则可以通过添加以下内容将其用于整个页面：ob_start();

<?php ob_start(); ?>

和php文件的开头，然后在最后，您可以在字符串中获取ob缓冲区并应用正则表达式：

<?php ob_start(); ?>
<iframe src="foo.bar"></iframe>

<iframe src="baz"></iframe>
<?php

$output = ob_get_contents();
ob_end_clean();

// find all iframes generated by php or that are in html    
preg_match_all('/<iframe[^>]+src="([^"]+)"/', $output, $match);

$urls = $match[1];
echo $output;

?>

public function makeiframevideo($url)
{

    // Youtube
    $ytRegExp = "/^(?:https?:\/\/)?(?:www\.)?(?:youtu\.be\/|youtube\.com\/(?:embed\/|v\/|watch\?v=|watch\?.+&v=))((\w|-){11})(?:\S+)?$/";
    preg_match($ytRegExp, $url, $ytMatch);
    if ($ytMatch && strlen($ytMatch[1]) === 11) {
        return "<iframe frameborder=\"0\" allowfullscreen class=\"pull-left\"  id=\"ytplayer\" type=\"text/html\" width=\"100%\" height=\"405\"  src=\"//www.youtube.com/embed/{$ytMatch[1]}?showinfo=0\" ></iframe>";
    }

    // Instagram
    $igRegExp = "/^(?:https?:\/\/)?(?:www\.)?instagram.com\/p\/(.[a-zA-Z0-9\_]*)/";
    preg_match($igRegExp, $url, $igMatch);
    if ($igMatch && strlen($igMatch[0])) {
        return "<iframe frameborder=\"0\" allowfullscreen class=\"pull-left\"  id=\"ytplayer\" type=\"text/html\" width=\"100%\" height=\"405\" src='{$igMatch[0]}/embed/' ></iframe>";
    }

    // Vine
    $vRegExp = "/^(?:https?:\/\/)?(?:www\.)?vine.co\/v\/(.[a-zA-Z0-9]*)/";
    preg_match($vRegExp, $url, $vMatch);
    if ($vMatch && strlen($vMatch[0])) {
        return "<iframe frameborder=\"0\" allowfullscreen class=\"pull-left\"  id=\"ytplayer\" type=\"text/html\" width=\"100%\" height=\"405\" src='{$vMatch[0]}/embed/simple' ></iframe>";
    }

    // Vimeo
    $vimRegExp = " /\/\/(player.)?vimeo.com\/([a-z]*\/)*([0-9]{6,11})[?]?.*/";
    preg_match($vimRegExp, $url, $vimMatch);
    if ($vimMatch && strlen($vimMatch[3])) {
        return "<iframe frameborder=\"0\" allowfullscreen class=\"pull-left\"  id=\"ytplayer\" type=\"text/html\" width=\"100%\" height=\"405\" src='//player.vimeo.com/video/{$vimMatch[3]}' ></iframe>";
    }

    // Dailymotion
    $dmRegExp = "/.+dailymotion.com\/(video|hub)\/([^_]+)[^#]*(#video=([^_&]+))?/";
    preg_match($dmRegExp, $url, $dmMatch);
    if ($dmMatch && strlen($dmMatch[2])) {
        return "<iframe frameborder=\"0\" allowfullscreen class=\"pull-left\"  id=\"ytplayer\" type=\"text/html\" width=\"100%\" height=\"405\" src='//www.dailymotion.com/embed/video/{$dmMatch[2]}' ></iframe>";
    }

    // Youku
    $youkuRegExp = "/\/\/v\.youku\.com\/v_show\/id_(\w+)/";
    preg_match($youkuRegExp, $url, $youkuMatch);
    if ($youkuMatch && strlen($youkuMatch[1])) {
        return "<iframe frameborder=\"0\" allowfullscreen class=\"pull-left\"  id=\"ytplayer\" type=\"text/html\" width=\"100%\" height=\"405\" src='//player.youku.com/embed/{$youkuMatch[1]}' ></iframe>";
    }



    $mp4RegExp = '/^.+.(mp4|m4v)$/';
    preg_match($mp4RegExp, $url, $mp4Match);

    $oggRegExp = '/^.+.(ogg|ogv)$/';
    preg_match($oggRegExp, $url, $oggMatch);

    $webmRegExp = '/^.+.(webm)$/';
    preg_match($webmRegExp, $url, $webmMatch);

    if ($mp4Match || $oggMatch || $webmMatch) {
        return $url;
    }

    return "";
}