My mother tongue is not English. Here I use Google translation.

I need to display the first video of the article on the home page.

The following code is used

But I have a question.Does this server have query pressure?

function catch_post_video($postid=0,$which=0){
    $content = get_post($postid)->post_content;  
    preg_match_all('/<video.*?(?: |\\t|\\r|\\n)?src=[\'"]?(.+?)[\'"]?(?:(?: |\\t|\\r|\\n)+.*?)?>/sim', $content, $strResult, PREG_PATTERN_ORDER);
    if( $which==0 ){
        $output = ( $strResult && isset($strResult[1]) )?count($strResult[1]):0;
    }else if( $which==1 ){
        $img_url = get_stylesheet_directory_uri().'/images/default.png';
        $output = ( $strResult && !empty($strResult[1]) && !empty($strResult[1][0]) ) ? $strResult[1][0] : $img_url;
    return $output;  

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