Convert all youtube link to embed

Question

I have this function to convert any YouTube URL in any post or page to embed :-

function embed_youtube_an($post_content) {
  global $posts; 
  //preg_match('|http://www.youtube.com/watch?v=([a-zA-Z0-9]+)|', $posts->post_content, $matches);
  preg_match('#http://w?w?w?.?youtube.com/watch\?v=([A-Za-z0-9\-_]+)#s', $posts->post_content, $matches);

 if (!empty($matches[1])) { 
    $post_content = '<object width="415" height="250">';
      $post_content .= '<param name="movie" value="http://www.youtube.com/v/' . $matches[1] . '&hl=en_US&fs=1&"></param>';
      $post_content .= '<param name="allowFullScreen" value="true"></param>';
      $post_content .= '<param name="allowscriptaccess" value="always"></param>';
      $post_content .= '<embed src="http://www.youtube.com/v/' . $matches[1] . '&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="415" height="250"></embed>';
      $post_content .= '</object>';
      $post_content = $post_content;

  }
     return $post_content;
}

add_filter('the_content', 'embed_youtube_an');

But when open post , all YouTube URL does not show in embed.

Where are the problem?

Answer 1

EDIT

After reviewing your edit, you may want to try following These Instructions

To embed a video or another object into a post or page, place its URL into the content area. Make sure the URL is on its own line and not hyperlinked (clickable when viewing the post).

---

It sounds like you would want to use wp_get_oembed() - The examples look like this:

Retrieve the embed code for a URL from a supported oEmbed provider:

<?php $embed_code = wp_oembed_get('http://www.youtube.com/watch?v=tkEvSjdDfiA'); ?>

Retrieve the embed code for a URL from a supported oEmbed provider - with width argument:

<?php $embed_code = wp_oembed_get('http://www.youtube.com/watch?v=tkEvSjdDfiA', array('width'=>400)); ?>

If that doesn't work you could probably apply 'the_content' filter:

apply_filters( 'the_content', 'http://www.youtube.com/watch?v=tkEvSjdDfiA' );

But that filter is probably overkill for what you're trying to achieve.

Answer 2

When you enter the URL, put your editor in TEXT mode. Lots of people don't notice the visual editor converts HTML special characters, and deactivates links.

Answer 3

You are making wrong use of the the_content filter.

Why your code is not working

• You are not returning anything back to the referenced content

• Even if your condition fails, you should pass the referenced content back, otherwise nothing will be displayed if your condition returns false

• Your preg_match function is using the wrong subject. Use the referenced content here. (This is just a note, you don't need to call the global $post)

• Your pattern is also wrong, it does not match any pattern thus failing and returning the content as-is

With the current code that you have, I have gone with parse_url() and parse_str() thanks to this answer. It has to be noted that from your original question that you are using the following format

• http://www.youtube.com/watch?v=C4kxS1ksqtw&feature=related and
• http://www.youtube.com/watch?v=C4kxS1ksqtw.

This code only works on the format watch?v=

I have modified your code accordingly:

add_filter('the_content', function ($post_content) 
{ 
    parse_str( parse_url( $post_content, PHP_URL_QUERY ),  $matches);

    if (!empty($matches['v'])) { 
        $post_content = '<object width="415" height="250">';
        $post_content .= '<param name="movie" value="http://www.youtube.com/v/' . $matches['v'] . '&hl=en_US&fs=1&"></param>';
        $post_content .= '<param name="allowFullScreen" value="true"></param>';
        $post_content .= '<param name="allowscriptaccess" value="always"></param>';
        $post_content .= '<embed src="http://www.youtube.com/v/' . $matches['v'] . '&hl=en_US&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="415" height="250"></embed>';
        $post_content .= '</object>';
        $post_content = $post_content;
    }
    return $post_content;
});

EDIT

As a test, the following code

<?php
$string = 'http://www.youtube.com/watch?v=C4kxS1ksqtw&feature=related';
parse_str( parse_url( $string, PHP_URL_QUERY ),  $matches);
?><pre><?php var_dump($matches); ?></pre><?php

gives the following output when dumped

array(2) {
  ["v"]=>
  string(11) "C4kxS1ksqtw"
  ["feature"]=>
  string(7) "related"
}