PHP function sample code to obtain the first image of each article in the website

Calling the first picture in the article as the list pageThumbnail image is a very popular practice, and the same is true by default for general themes in WordPress, so let’s do it together next Take a look at the code example of PHP getting the first picture of each article on the website

<?php 
$temp=mt_rand(1,4); 
$pattern="/<[img|IMG].*?src=[\&#39;|\"](.*?(?:[\.gif|\.jpg|\.png]))[\&#39;|\"].*?[\/]?>/"; 
$content = $article->Content; //文章内容 
preg_match_all($pattern,$content,$matchContent); 
if(isset($matchContent[1][0])){ 
  $temp=$matchContent[1][0]; 
}else{ 
  $temp="images/random/$temp.jpg";//需要在相应位置放置4张jpg的文件，名称为1，2，3，4 
} 
 
?>

The above code calls the first picture of the article by default. When the article has no picture, it randomly calls the theme style/ 1.jpg, 2.jpg, 3.jpg, 4.jpg pictures under images/random/. If you don’t want to call a random picture, you can modify it:

<?php 
$pattern="/<[img|IMG].*?src=[\&#39;|\"](.*?(?:[\.gif|\.jpg|\.png]))[\&#39;|\"].*?[\/]?>/"; 
$content = $article->Content; //文章内容 
preg_match_all($pattern,$content,$matchContent); 
if(isset($matchContent[1][0])){ 
  $temp=$matchContent[1][0]; 
}else{ 
  $temp="./images/no-image.jpg";//在相应位置放置一张命名为no-image的jpg图片 
} 
 
?>

Call the first picture of the article. If the article has no picture, call the default picture no-image.jpg

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