helpers.php

<?php
/**
 * Generate a exceprt from whatever argument it's passed to it
 * @param $post object|string Post object with excerpt and/or content OR string
 * @param $args object|array|string Arguments: length, echo, strict mode
 * @return string Formatted excerpt
 * @author Felipe Lavín <felipe@yukei.net>
 * */
function do_excerpt($post, $args=null){
	$params = wp_parse_args($args, array(
		'length' => 255,
		'echo' => false,
		'strict' => false,
		'wrap' => null,
		'wrap_id' => null,
		'wrap_class' => 'entry-excerpt',
		'hellip' => false,
		'append' => null
	));
	$out = $wrap = '';
	if ( $params['wrap'] ) {
		$wrap_id = $params['wrap_id'] ? ' id="'. esc_attr( $params['wrap_id'] ) .'"' : null;
		$wrap_class = $params['wrap_class'] ? ' class="'. esc_attr( $params['wrap_class'] ) .'"' : null;
		$wrap = '<'. $params['wrap'] . $wrap_id . $wrap_class .'>';
	}
	if ( is_string($post) ) {
		$excerpt = strip_shortcodes($post);
		$excerpt = strip_tags($excerpt);
		if ( strlen($excerpt) > $params['length'] ) {
			$excerpt = smart_substr($excerpt, $params['length']);
			if ( $params['hellip'] ) $excerpt .= ' '. $params['hellip'];
		}
		if ( $params['append'] ) $excerpt .= ' '. $params['append'];
		$out .= apply_filters('the_excerpt', $excerpt);
	} elseif ( is_object($post) ) {
		if ( isset($post->post_excerpt) && !empty($post->post_excerpt) ) {
			if ( $params['strict'] && strlen($post->post_excerpt) > $params['length'] ) {
				$buff = smart_substr($post->post_excerpt, $params['length']);
				if ($params['hellip'] ) $buff .= ' '. $params['hellip'];
				if ( $params['append'] ) $buff .= ' '. $params['append'];
				$out .= apply_filters('the_excerpt', $buff);
			} else {
				if ( $params['append'] ) $post->post_excerpt .= ' '. $params['append'];
				$out .= apply_filters('the_excerpt', $post->post_excerpt);
			}
		} elseif ( isset($post->post_content) && !empty($post->post_content) ) {
			return do_excerpt($post->post_content, $params);
		}
	}

	if ( !$out ) return false;

	if ( $out ) {
		if ( $params['wrap'] ) {
		    $wrap .= $out . '</'. $params['wrap'] .'>';
		    $out = $wrap;
		}
		if( $params['echo'] ) echo $out;
		else return $out;
	}
}

/**
 * Smarter text cutting
 * @param $str string contenido a cortar
 * @param string cantidad de caracteres que se mostraran
 * @return string
 * @author Basilio Cáceres <bcaceres@ayerviernes.com>
 */
function smart_substr($str,$n,$hellip=true){
	if ( strlen($str) > $n ) {
		$out = substr( strip_tags($str), 0, $n );
		$out = explode(" ",$out);
		array_pop( $out );
		$out = implode(" ",$out);
		if ( $hellip ) $out .= ' [&hellip;]';
	} else {
		$out = $str;
	}
	return $out;
}

class videos {
	/**  
    *   function get_video_embed
	*   Extract and return video id from youtbe & vimeo videos
	*	@param url : Video url
	*/
	static function get_video_embed($url,$width='100%',$height=450) {
		if (strstr($url,'youtube')){
			$parse_url = parse_url($url);
            $output = array();
			parse_str( $parse_url['query'], $output );
			$id = $output['v'];
			$iframe = '<iframe width="'.$width.'" height="'.$height.'" src="http://www.youtube.com/embed/'.$id.'" frameborder="0" allowfullscreen></iframe>';
			return $iframe;
		}
        if (strstr($url,'youtu.be')) {
            $parse_url = parse_url( $url );
            $id = array_pop( explode( '/', $parse_url ) );
            $iframe = '<iframe width="'.$width.'" height="'.$height.'" src="http://www.youtube.com/embed/'.$id.'" frameborder="0" allowfullscreen></iframe>';
            return $iframe;
        }
		if (strstr($url,'vimeo')) {
			if (!empty( $url ) ) {
				$id = array_pop( explode('/', $url) );
				$iframe='<iframe src="http://player.vimeo.com/video/'.$id.'" width="'.$width.'" height="'.$height.'" frameborder="0" webkitAllowFullScreen mozallowfullscreen allowFullScreen></iframe>';
				return $iframe;
			}
		}
		return false;

	}
	static function get_video_class($url) {
		if (strstr($url,'youtube')){
			return 'youtube-lightbox';
		}
		if (strstr($url,'vimeo')){
			return 'vimeo-lightbox';
		}
	}
	/**
	* function get_video_thumb
	* Extract and return video id from youtbe & vimeo videos
	* @param url : Video url
	* @param size: small, medium
	*/
	static function get_video_thumb($url,$size='full') {
		if (strstr($url,'youtube')){
			$parse_url=parse_url($url);
			parse_str($parse_url['query']);
			$id=$v;
			$def_size = ($size=='small')?1:0;
			$thumb='http://img.youtube.com/vi/'.$id.'/'.$def_size.'.jpg';
			return $thumb;
		}
        if (strstr($url,'youtu.be')) {
            $parse_url = parse_url( $url );
            $id = array_pop( explode( '/', $parse_url ) );
            $def_size = ($size=='small')?1:0;
			$thumb='http://img.youtube.com/vi/'.$id.'/'.$def_size.'.jpg';
			return $thumb;
        }
		if (strstr($url,'vimeo')) {
			$thumb = '';
			if (!empty($url)) {
				if ( false === ( $thumb = get_transient( 'vimeo_'.$id ) ) ) {

				$id=array_pop(explode('/',$url));
				$request = new WP_Http;
				$result = $request->request( 'http://vimeo.com/api/v2/video/'.$id.'.php' , $args );
				//$iframe='<iframe src="http://player.vimeo.com/video/'.$id.'?title=0&amp;byline=0&amp;portrait=0" width="'.$width.'" height="'.$height.'" frameborder="0" webkitAllowFullScreen mozallowfullscreen allowFullScreen></iframe>';
				if (!is_wp_error( $result )) {
					$body = maybe_unserialize($result['body']);
					if ($size == 'medium') 
						$thumb = $body[0]['thumbnail_medium'];
					else
						$thumb = $body[0]['thumbnail_large'];
					set_transient('vimeo_'.$id,$thumb,60*60*24);
				}
			}
				return $thumb;
			}
		}
		return false;

	}
}