Javascript 如何显示og:在我的链接网站缩略图图像
我有一个输入字段,用户可以在其中输入URL(网站链接、视频链接、谷歌地图链接或任何其他链接)Javascript 如何显示og:在我的链接网站缩略图图像,javascript,php,html,thumbnails,video-thumbnails,Javascript,Php,Html,Thumbnails,Video Thumbnails,我有一个输入字段,用户可以在其中输入URL(网站链接、视频链接、谷歌地图链接或任何其他链接) 我想显示这些链接的缩略图和描述作为预览,而不是简单的URL。 我想使用og:image meta来获取缩略图,但我不知道如何存档,应该使用什么技术,或者是否有任何api来获取缩略图。 谢谢您可以使用下面的代码。只需使用POST请求将url变量传递给get\u url\u data.php,您将得到image、description和title 获取_url_data.php <?php if
我想显示这些链接的缩略图和描述作为预览,而不是简单的URL。
我想使用og:image meta来获取缩略图,但我不知道如何存档,应该使用什么技术,或者是否有任何api来获取缩略图。
谢谢您可以使用下面的代码。只需使用
POST
请求将url
变量传递给get\u url\u data.php
,您将得到image
、description
和title
获取_url_data.php
<?php
if(isset($_POST['url']) && !empty($_POST['url']) && filter_var($_POST['url'], FILTER_VALIDATE_URL)) {
//gets the HTML data
$source = getData($_POST['url']);
// DOM document Creation
$doc = new DOMDocument;
libxml_use_internal_errors(true);
$doc->loadHTML($source);
libxml_clear_errors();
// DOM XPath Creation
$xpath = new DOMXPath($doc);
// Gets title
$title = $xpath->query('//title')->item(0)->textContent;
if(empty($title))
$title = "No title found";
// Gets all Open Graph images
$events = $xpath->query('//meta[@property="og:image"]/@content');
$image = "";
for($i = 0; $i < ($events->length); $i++) {
$event = $events->item($i);
$des = $xpath->evaluate('//meta[@property="og:image"]/@content', $event);
if ($des->length > 0) {
$image = $des->item(0)->value;
break;
}
}
if(empty($image))
$image = "image-not-found.gif";
// Gets all Open Graph descriptions
$events = $xpath->query('//meta[@property="og:description"]/@content');
$description = "";
for($i = 0; $i < ($events->length); $i++) {
$event = $events->item($i);
$des = $xpath->evaluate('//meta[@property="og:description"]/@content', $event);
if ($des->length > 0) {
$description = $des->item(0)->value;
break;
}
}
if(empty($description))
$description = "-- No description found --";
//output
$data = array('title' => $title, 'image' => $image, 'description' => $description);
echo json_encode($data);
}
//fetches HTML data from a URL
function getData($url)
{
$ch = curl_init();
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_HEADER,0);
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.7) Gecko/20091221 Firefox/3.5.7 GTB6 (.NET CLR 3.0.4506.2152)");
curl_setopt($ch, CURLOPT_FOLLOWLOCATION,1);
curl_setopt($ch, CURLOPT_URL, $url);
$content = curl_exec($ch);
curl_close($ch);
return $content;
}
loadHTML($source);
libxml_clear_errors();
//domxpath创建
$xpath=新的DOMXPath($doc);
//获得头衔
$title=$xpath->query('//title')->item(0)->textContent;
如果(空($title))
$title=“未找到标题”;
//获取所有打开的图形图像
$events=$xpath->query('//meta[@property=“og:image”]/@content');
$image=“”;
对于($i=0;$i<($events->length);$i++){
$event=$events->item($i);
$des=$xpath->evaluate('//meta[@property=“og:image”]/@content',$event);
如果($des->length>0){
$image=$des->item(0)->value;
打破
}
}
if(空($image))
$image=“未找到图像.gif”;
//获取所有打开的图形描述
$events=$xpath->query('//meta[@property=“og:description”]/@content');
$description=“”;
对于($i=0;$i<($events->length);$i++){
$event=$events->item($i);
$des=$xpath->evaluate('//meta[@property=“og:description”]/@content',$event);
如果($des->length>0){
$description=$des->item(0)->value;
打破
}
}
if(空($description))
$description=“--找不到描述--”;
//输出
$data=array('title'=>$title,'image'=>$image,'description'=>$description);
echo json_编码($data);
}
//从URL获取HTML数据
函数getData($url)
{
$ch=curl_init();
curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch,CURLOPT_头,0);
curl_setopt($ch,CURLOPT_USERAGENT,“Mozilla/5.0(Windows;U;Windows NT 5.1;en-US;rv:1.9.1.7)Gecko/20091221 Firefox/3.5.7 GTB6(.NET CLR 3.0.4506.2152)”;
curl_setopt($ch,CURLOPT_FOLLOWLOCATION,1);
curl_setopt($ch,CURLOPT_URL,$URL);
$content=curl\u exec($ch);
卷曲关闭($ch);
返回$content;
}
您还可以查看mygit
存储库以了解更多详细信息
使用domdocument和xpath解析html和fibd
$xpath->evaluate('//meta[@name=“description”]/@content')代码>
<?php
if(isset($_POST['url']) && !empty($_POST['url']) && filter_var($_POST['url'], FILTER_VALIDATE_URL)) {
//gets the HTML data
$source = getData($_POST['url']);
// DOM document Creation
$doc = new DOMDocument;
libxml_use_internal_errors(true);
$doc->loadHTML($source);
libxml_clear_errors();
// DOM XPath Creation
$xpath = new DOMXPath($doc);
// Gets title
$title = $xpath->query('//title')->item(0)->textContent;
if(empty($title))
$title = "No title found";
// Gets all Open Graph images
$events = $xpath->query('//meta[@property="og:image"]/@content');
$image = "";
for($i = 0; $i < ($events->length); $i++) {
$event = $events->item($i);
$des = $xpath->evaluate('//meta[@property="og:image"]/@content', $event);
if ($des->length > 0) {
$image = $des->item(0)->value;
break;
}
}
if(empty($image))
$image = "image-not-found.gif";
// Gets all Open Graph descriptions
$events = $xpath->query('//meta[@property="og:description"]/@content');
$description = "";
for($i = 0; $i < ($events->length); $i++) {
$event = $events->item($i);
$des = $xpath->evaluate('//meta[@property="og:description"]/@content', $event);
if ($des->length > 0) {
$description = $des->item(0)->value;
break;
}
}
if(empty($description))
$description = "-- No description found --";
//output
$data = array('title' => $title, 'image' => $image, 'description' => $description);
echo json_encode($data);
}
//fetches HTML data from a URL
function getData($url)
{
$ch = curl_init();
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_HEADER,0);
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.7) Gecko/20091221 Firefox/3.5.7 GTB6 (.NET CLR 3.0.4506.2152)");
curl_setopt($ch, CURLOPT_FOLLOWLOCATION,1);
curl_setopt($ch, CURLOPT_URL, $url);
$content = curl_exec($ch);
curl_close($ch);
return $content;
}