get_oembed.php

<?php

function get_oembed( $url, $post_id, $args = array() ) {
	global $wp_embed;

	$oembed_url = esc_url( $url );

	// Sanitize object_id
	$post_id = absint( $post_id );

	$args = wp_parse_args( $args, array(
		'oembed_args'     => array(),
		'fallback_to_url' => false,
	) );

	$wp_embed->post_ID = $post_id;

	$embed_args = '';
	foreach ( $args['oembed_args'] as $key => $val ) {
		$embed_args .= ' '. $key .'="'. $val .'"';
	}

	// ping WordPress for an embed
	$check_embed = $wp_embed->run_shortcode( '[embed'. $embed_args .']'. $oembed_url .'[/embed]' );

	// fallback that WordPress creates when no oEmbed was found
	$fallback = $wp_embed->maybe_make_link( $oembed_url );

	if ( $check_embed == $fallback ) {
		return $args['fallback_to_url'] ? $fallback : false;
	}

	return $check_embed;

}