Responsive audio player WordPress plugin based on http://osvaldas.info/audio-player-responsive-and-touch-friendly

audio-player.css

/*
  PLAYER
*/
.site-title {display:none;}
.audioplayer
{
	height: 2.5em; /* 40 */
	color: #fff;
	text-shadow: 1px 1px 0 #000;
	border: 1px solid #222;
	position: relative;
	z-index: 1;
	background: #333;
	background: -webkit-gradient( linear, left top, left bottom, from( #444 ), to( #222 ) );
	background: -webkit-linear-gradient( top, #444, #222 );
	background: -moz-linear-gradient( top, #444, #222 );
	background: -ms-radial-gradient( top, #444, #222 );
	background: -o-linear-gradient( top, #444, #222 );
	background: linear-gradient( top, #444, #222 );
	-webkit-box-shadow: inset 0 1px 0 rgba( 255, 255, 255, .15 ), 0 0 1.25em rgba( 0, 0, 0, .5 ); /* 20 */
	-moz-box-shadow: inset 0 1px 0 rgba( 255, 255, 255, .15 ), 0 0 1.25em rgba( 0, 0, 0, .5 ); /* 20 */
	box-shadow: inset 0 1px 0 rgba( 255, 255, 255, .15 ), 0 0 1.25em rgba( 0, 0, 0, .5 ); /* 20 */
	-webkit-border-radius: 2px;
	-moz-border-radius: 2px;
	border-radius: 2px;
}
	.audioplayer-mini
	{
		width: 2.5em; /* 40 */
		margin: 0 auto;
	}
	.audioplayer-mini audio
	{
		display: none;
	}
	.audioplayer > div
	{
		position: absolute;
	}
	.audioplayer-playpause
	{
		width: 2.5em; /* 40 */
		height: 100%;
		text-align: left;
		text-indent: -9999px;
		cursor: pointer;
		z-index: 2;
		top: 0;
		left: 0;
	}
		.audioplayer:not(.audioplayer-mini) .audioplayer-playpause
		{
			border-right: 1px solid #555;
			border-right-color: rgba( 255, 255, 255, .1 );
		}
		.audioplayer-mini .audioplayer-playpause
		{
			width: 100%;
		}
		.audioplayer-playpause:hover,
		.audioplayer-playpause:focus
		{
			background-color: #222;
		}
		.audioplayer-playpause a
		{
			display: block;
		}
		.audioplayer:not(.audioplayer-playing) .audioplayer-playpause a
		{
			width: 0;
			height: 0;
			border: 0.5em solid transparent; /* 8 */
			border-right: none;
			border-left-color: #fff;
			content: '';
			position: absolute;
			top: 50%;
			left: 50%;
			margin: -0.5em 0 0 -0.25em; /* 8 4 */
		}
		.audioplayer-playing .audioplayer-playpause a
		{
			width: 0.75em; /* 12 */
			height: 0.75em; /* 12 */
			position: absolute;
			top: 50%;
			left: 50%;
			margin: -0.375em 0 0 -0.375em; /* 6 */
		}
			.audioplayer-playing .audioplayer-playpause a:before,
			.audioplayer-playing .audioplayer-playpause a:after
			{
				width: 40%;
				height: 100%;
				background-color: #fff;
				content: '';
				position: absolute;
				top: 0;
			}
			.audioplayer-playing .audioplayer-playpause a:before
			{
				left: 0;
			}
			.audioplayer-playing .audioplayer-playpause a:after
			{
				right: 0;
			}
	.audioplayer-time
	{
		width: 4.375em; /* 70 */
		height: 100%;
		line-height: 2.375em; /* 38 */
		text-align: center;
		z-index: 2;
		top: 0;
	}
		.audioplayer-time-current
		{
			border-left: 1px solid #111;
			border-left-color: rgba( 0, 0, 0, .25 );
			left: 2.5em; /* 40 */
		}
		.audioplayer-time-duration
		{
			border-right: 1px solid #555;
			border-right-color: rgba( 255, 255, 255, .1 );
			right: 2.5em; /* 40 */
		}
			.audioplayer-novolume .audioplayer-time-duration
			{
				border-right: 0;
				right: 0;
			}
	.audioplayer-bar
	{
		height: 0.875em; /* 14 */
		background-color: #222;
		cursor: pointer;
		z-index: 1;
		top: 50%;
		right: 6.875em; /* 110 */
		left: 6.875em; /* 110 */
		margin-top: -0.438em; /* 7 */
	}
		.audioplayer-novolume .audioplayer-bar
		{
			right: 4.375em; /* 70 */
		}
		.audioplayer-bar div
		{
			width: 0;
			height: 100%;
			position: absolute;
			left: 0;
			top: 0;
		}
		.audioplayer-bar-loaded
		{
			background-color: #333;
			z-index: 1;
		}
		.audioplayer-bar-played
		{
			background: #007fd1;
			background: -webkit-gradient( linear, left top, right top, from( #007fd1 ), to( #c600ff ) );
			background: -webkit-linear-gradient( left, #007fd1, #c600ff );
			background: -moz-linear-gradient( left, #007fd1, #c600ff );
			background: -ms-radial-gradient( left, #007fd1, #c600ff );
			background: -o-linear-gradient( left, #007fd1, #c600ff );
			background: linear-gradient( left, #007fd1, #c600ff );
			z-index: 2;
		}
	.audioplayer-volume
	{
		width: 2.5em; /* 40 */
		height: 100%;
		border-left: 1px solid #111;
		border-left-color: rgba( 0, 0, 0, .25 );
		text-align: left;
		text-indent: -9999px;
		cursor: pointer;
		z-index: 2;
		top: 0;
		right: 0;
	}
		.audioplayer-volume:hover,
		.audioplayer-volume:focus
		{
			background-color: #222;
		}
		.audioplayer-volume-button
		{
			width: 100%;
			height: 100%;
		}
			.audioplayer-volume-button a
			{
				width: 0.313em; /* 5 */
				height: 0.375em; /* 6 */
				background-color: #fff;
				display: block;
				position: relative;
				z-index: 1;
				top: 40%;
				left: 35%;
			}
				.audioplayer-volume-button a:before,
				.audioplayer-volume-button a:after
				{
					content: '';
					position: absolute;
				}
				.audioplayer-volume-button a:before
				{
					width: 0;
					height: 0;
					border: 0.5em solid transparent; /* 8 */
					border-left: none;
					border-right-color: #fff;
					z-index: 2;
					top: 50%;
					right: -0.25em;
					margin-top: -0.5em; /* 8 */
				}
				.audioplayer:not(.audioplayer-mute) .audioplayer-volume-button a:after
				{
					/* "volume" icon by Nicolas Gallagher, http://nicolasgallagher.com/pure-css-gui-icons */
					width: 0.313em; /* 5 */
					height: 0.313em; /* 5 */
					border: 0.25em double #fff; /* 4 */
					border-width: 0.25em 0.25em 0 0; /* 4 */
					left: 0.563em; /* 9 */
					top: -0.063em; /* 1 */
					-webkit-border-radius: 0 0.938em 0 0; /* 15 */
					-moz-border-radius: 0 0.938em 0 0; /* 15 */
					border-radius: 0 0.938em 0 0; /* 15 */
					-webkit-transform: rotate( 45deg );
					-moz-transform: rotate( 45deg );
					-ms-transform: rotate( 45deg );
					-o-transform: rotate( 45deg );
					transform: rotate( 45deg );
				}
		.audioplayer-volume-adjust
		{
			height: 6.25em; /* 100 */
			cursor: default;
			position: absolute;
			left: 0;
			right: -1px;
			top: -9999px;
			background: #222;
			background: -webkit-gradient( linear, left top, left bottom, from( #444 ), to( #222 ) );
			background: -webkit-linear-gradient( top, #444, #222 );
			background: -moz-linear-gradient( top, #444, #222 );
			background: -ms-radial-gradient( top, #444, #222 );
			background: -o-linear-gradient( top, #444, #222 );
			background: linear-gradient( top, #444, #222 );
			-webkit-border-top-left-radius: 2px;
			-webkit-border-top-right-radius: 2px;
			-moz-border-radius-topleft: 2px;
			-moz-border-radius-topright: 2px;
			border-top-left-radius: 2px;
			border-top-right-radius: 2px;
		}
			.audioplayer-volume:not(:hover) .audioplayer-volume-adjust
			{
				opacity: 0;
			}
			.audioplayer-volume:hover .audioplayer-volume-adjust
			{
				top: auto;
				bottom: 100%;
			}
			.audioplayer-volume-adjust > div
			{
				width: 40%;
				height: 80%;
				background-color: #222;
				cursor: pointer;
				position: relative;
				z-index: 1;
				margin: 30% auto 0;
			}
				.audioplayer-volume-adjust div div
				{
					width: 100%;
					height: 100%;
					position: absolute;
					bottom: 0;
					left: 0;
					background: #007fd1;
					background: -webkit-gradient( linear, left bottom, left top, from( #007fd1 ), to( #c600ff ) );
					background: -webkit-linear-gradient( bottom, #007fd1, #c600ff );
					background: -moz-linear-gradient( bottom, #007fd1, #c600ff );
					background: -ms-radial-gradient( bottom, #007fd1, #c600ff );
					background: -o-linear-gradient( bottom, #007fd1, #c600ff );
					background: linear-gradient( bottom, #007fd1, #c600ff );
				}
		.audioplayer-novolume .audioplayer-volume
		{
			display: none;
		}

	.audioplayer-play,
	.audioplayer-pause,
	.audioplayer-volume a
	{
		-webkit-filter: drop-shadow( 1px 1px 0 #000 );
		-moz-filter: drop-shadow( 1px 1px 0 #000 );
		-ms-filter: drop-shadow( 1px 1px 0 #000 );
		-o-filter: drop-shadow( 1px 1px 0 #000 );
		filter: drop-shadow( 1px 1px 0 #000 );
	}
	.audioplayer-bar,
	.audioplayer-bar div,
	.audioplayer-volume-adjust div
	{
		-webkit-border-radius: 4px;
		-moz-border-radius: 4px;
		border-radius: 4px;
	}
	.audioplayer-bar,
	.audioplayer-volume-adjust > div
	{
		-webkit-box-shadow: -1px -1px 0 rgba( 0, 0, 0, .5 ), 1px 1px 0 rgba( 255, 255, 255, .1 );
		-moz-box-shadow: -1px -1px 0 rgba( 0, 0, 0, .5 ), 1px 1px 0 rgba( 255, 255, 255, .1 );
		box-shadow: -1px -1px 0 rgba( 0, 0, 0, .5 ), 1px 1px 0 rgba( 255, 255, 255, .1 );
	}
	.audioplayer-volume-adjust div div,
	.audioplayer-bar-played
	{
		-webkit-box-shadow: inset 0 0 5px rgba( 255, 255, 255, .5 );
		-moz-box-shadow: inset 0 0 5px rgba( 255, 255, 255, .5 );
		box-shadow: inset 0 0 5px rgba( 255, 255, 255, .5 );
	}
	.audioplayer-volume-adjust
	{
		-webkit-box-shadow: -2px -2px 2px rgba( 0, 0, 0, .15 ), 2px -2px 2px rgba( 0, 0, 0, .15 );
		-moz-box-shadow: -2px -2px 2px rgba( 0, 0, 0, .15 ), 2px -2px 2px rgba( 0, 0, 0, .15 );
		box-shadow: -2px -2px 2px rgba( 0, 0, 0, .15 ), 2px -2px 2px rgba( 0, 0, 0, .15 );
	}
	.audioplayer *,
	.audioplayer *:before,
	.audioplayer *:after
	{
		-webkit-transition: color .25s ease, background-color .25s ease, opacity .5s ease;
		-moz-transition: color .25s ease, background-color .25s ease, opacity .5s ease;
		-ms-transition: color .25s ease, background-color .25s ease, opacity .5s ease;
		-o-transition: color .25s ease, background-color .25s ease, opacity .5s ease;
		transition: color .25s ease, background-color .25s ease, opacity .5s ease;
	}


/* responsiveness */

@media only screen and ( max-width: 32.5em ) /* 520 */
{
	body
	{
		-webkit-box-shadow: inset 0 0 9.375em rgba( 0, 0, 0, .5 ); /* 150 */
		-moz-box-shadow: inset 0 0 9.375em rgba( 0, 0, 0, 5 ); /* 150 */
		box-shadow: inset 0 0 9.375em rgba( 0, 0, 0, .5 ); /* 150 */
	}
	#wrapper
	{
		width: 100%;
		height: auto;
		position: static;
		padding: 1.25em; /* 20 */
		margin: 0;
	}
}

audio-player.js

/*
  VIEWPORT BUG FIX
	iOS viewport scaling bug fix, by @mathias, @cheeaun and @jdalton
*/
(function(doc){var addEvent='addEventListener',type='gesturestart',qsa='querySelectorAll',scales=[1,1],meta=qsa in doc?doc[qsa]('meta[name=viewport]'):[];function fix(){meta.content='width=device-width,minimum-scale='+scales[0]+',maximum-scale='+scales[1];doc.removeEventListener(type,fix,true);}if((meta=meta[meta.length-1])&&addEvent in doc){fix();scales=[.25,1.6];doc[addEvent](type,fix,true);}}(document));

/*
	AUTHOR: Osvaldas Valutis, www.osvaldas.info
*/

jQuery(document).ready(function($) {   
	var isTouch		  = 'ontouchstart' in window,
		eStart		  = isTouch ? 'touchstart'	: 'mousedown',
		eMove		  = isTouch ? 'touchmove'	: 'mousemove',
		eEnd		  = isTouch ? 'touchend'	: 'mouseup',
		eCancel		  = isTouch ? 'touchcancel'	: 'mouseup',
		secondsToTime = function( secs )
		{
			var hours = Math.floor( secs / 3600 ), minutes = Math.floor( secs % 3600 / 60 ), seconds = Math.ceil( secs % 3600 % 60 );
			return ( hours == 0 ? '' : hours > 0 && hours.toString().length < 2 ? '0'+hours+':' : hours+':' ) + ( minutes.toString().length < 2 ? '0'+minutes : minutes ) + ':' + ( seconds.toString().length < 2 ? '0'+seconds : seconds );
		},
		canPlayType	  = function( file )
		{
			var audioElement = document.createElement( 'audio' );
			return !!( audioElement.canPlayType && audioElement.canPlayType( 'audio/' + file.split( '.' ).pop().toLowerCase() + ';' ).replace( /no/, '' ) );
		};

	$.fn.audioPlayer = function( params )
	{
		var params		= $.extend( { classPrefix: 'audioplayer', strPlay: 'Play', strPause: 'Pause', strVolume: 'Volume' }, params ),
			cssClass	= {},
			cssClassSub =
			{
				playPause:	 	'playpause',
				playing:		'playing',
				time:		 	'time',
				timeCurrent:	'time-current',
				timeDuration: 	'time-duration',
				bar: 			'bar',
				barLoaded:		'bar-loaded',
				barPlayed:		'bar-played',
				volume:		 	'volume',
				volumeButton: 	'volume-button',
				volumeAdjust: 	'volume-adjust',
				noVolume: 		'novolume',
				mute: 			'mute',
				mini: 			'mini'
			};

		for( var subName in cssClassSub )
			cssClass[ subName ] = params.classPrefix + '-' + cssClassSub[ subName ];

		this.each( function()
		{
			if( $( this ).prop( 'tagName' ).toLowerCase() != 'audio' )
				return false;

			var $this	   = $( this ),
				audioFile  = $this.attr( 'src' ),
				isAutoPlay = $this.get( 0 ).getAttribute( 'autoplay' ), isAutoPlay = isAutoPlay === '' || isAutoPlay === 'autoplay' ? true : false,
				isLoop	   = $this.get( 0 ).getAttribute( 'loop' ),		isLoop	   = isLoop		=== '' || isLoop	 === 'loop'		? true : false,
				isSupport  = false;

			if( typeof audioFile === 'undefined' )
			{
				$this.find( 'source' ).each( function()
				{
					audioFile = $( this ).attr( 'src' );
					if( typeof audioFile !== 'undefined' && canPlayType( audioFile ) )
					{
						isSupport = true;
						return false;
					}
				});
			}
			else if( canPlayType( audioFile ) ) isSupport = true;

			var thePlayer = $( '<div class="' + params.classPrefix + '">' + ( isSupport ? $( '<div>' ).append( $this.eq( 0 ).clone() ).html() : '<embed src="' + audioFile + '" width="0" height="0" volume="100" autostart="' + isAutoPlay.toString() +'" loop="' + isLoop.toString() + '" />' ) + '<div class="' + cssClass.playPause + '" title="' + params.strPlay + '"><a href="#">' + params.strPlay + '</a></div></div>' ),
				theAudio  = isSupport ? thePlayer.find( 'audio' ) : thePlayer.find( 'embed' ), theAudio = theAudio.get( 0 ),
				playPause = thePlayer.find( '.' + cssClass.playPause );

			if( isSupport )
			{
				thePlayer.find( 'audio' ).css( { 'width': 0, 'height': 0, 'visibility': 'hidden' } );
				thePlayer.append( '<div class="' + cssClass.time + ' ' + cssClass.timeCurrent + '"></div><div class="' + cssClass.bar + '"><div class="' + cssClass.barLoaded + '"></div><div class="' + cssClass.barPlayed + '"></div></div><div class="' + cssClass.time + ' ' + cssClass.timeDuration + '"></div><div class="' + cssClass.volume + '"><div class="' + cssClass.volumeButton + '" title="' + params.strVolume + '"><a href="#">' + params.strVolume + '</a></div><div class="' + cssClass.volumeAdjust + '"><div><div></div></div></div></div>' );

				var theBar			  = thePlayer.find( '.' + cssClass.bar ),
					barPlayed	 	  = thePlayer.find( '.' + cssClass.barPlayed ),
					barLoaded	 	  = thePlayer.find( '.' + cssClass.barLoaded ),
					timeCurrent		  = thePlayer.find( '.' + cssClass.timeCurrent ),
					timeDuration	  = thePlayer.find( '.' + cssClass.timeDuration ),
					volumeButton	  = thePlayer.find( '.' + cssClass.volumeButton ),
					volumeAdjuster	  = thePlayer.find( '.' + cssClass.volumeAdjust + ' > div' ),
					volumeDefault	  = 0,
					adjustCurrentTime = function( e )
					{
						theRealEvent		 = isTouch ? e.originalEvent.touches[ 0 ] : e;
						theAudio.currentTime = Math.round( ( theAudio.duration * ( theRealEvent.pageX - theBar.offset().left ) ) / theBar.width() );
					},
					adjustVolume = function( e )
					{
						theRealEvent	= isTouch ? e.originalEvent.touches[ 0 ] : e;
						theAudio.volume = Math.abs( ( theRealEvent.pageY - ( volumeAdjuster.offset().top + volumeAdjuster.height() ) ) / volumeAdjuster.height() );
					},
					updateLoadBar = function() {
						setTimeout( function() {
							barLoaded.width( ( theAudio.buffered.end( 0 ) / theAudio.duration ) * 100 + '%' );

							if( theAudio.buffered.end( 0 ) < theAudio.duration )
								updateLoadBar( updateLoadBar );
						}, 100 );
					};

				var volumeTestDefault = theAudio.volume, volumeTestValue = theAudio.volume = 0.111;
				if( Math.round( theAudio.volume * 1000 ) / 1000 == volumeTestValue ) theAudio.volume = volumeTestDefault;
				else thePlayer.addClass( cssClass.noVolume );

				timeDuration.html( '&hellip;' );
				timeCurrent.text( secondsToTime( 0 ) );

				theAudio.addEventListener( 'loadedmetadata', function()
				{
					updateLoadBar();
				});

				theAudio.addEventListener( 'loadeddata', function()
				{
					timeDuration.text( secondsToTime( theAudio.duration ) );
					volumeAdjuster.find( 'div' ).height( theAudio.volume * 100 + '%' );
					volumeDefault = theAudio.volume;
				});

				theAudio.addEventListener( 'timeupdate', function()
				{
					timeCurrent.text( secondsToTime( theAudio.currentTime ) );
					barPlayed.width( ( theAudio.currentTime / theAudio.duration ) * 100 + '%' );
				});

				theAudio.addEventListener( 'volumechange', function()
				{
					volumeAdjuster.find( 'div' ).height( theAudio.volume * 100 + '%' );
					if( theAudio.volume > 0 && thePlayer.hasClass( cssClass.mute ) ) thePlayer.removeClass( cssClass.mute );
					if( theAudio.volume <= 0 && !thePlayer.hasClass( cssClass.mute ) ) thePlayer.addClass( cssClass.mute );
				});

				theAudio.addEventListener( 'ended', function()
				{
					thePlayer.removeClass( cssClass.playing );
				});

				theBar.on( eStart, function( e )
				{
					adjustCurrentTime( e );
					theBar.on( eMove, function( e ) { adjustCurrentTime( e ); } );
				})
				.on( eCancel, function()
				{
					theBar.unbind( eMove );
				});

				volumeButton.on( 'click', function()
				{
					if( thePlayer.hasClass( cssClass.mute ) )
					{
						thePlayer.removeClass( cssClass.mute );
						theAudio.volume = volumeDefault;
					}
					else
					{
						thePlayer.addClass( cssClass.mute );
						volumeDefault = theAudio.volume;
						theAudio.volume = 0;
					}
					return false;
				});

				volumeAdjuster.on( eStart, function( e )
				{
					adjustVolume( e );
					volumeAdjuster.on( eMove, function( e ) { adjustVolume( e ); } );
				})
				.on( eCancel, function()
				{
					volumeAdjuster.unbind( eMove );
				});
			}
			else thePlayer.addClass( cssClass.mini );

			if( isAutoPlay ) thePlayer.addClass( cssClass.playing );

			theAudio.addEventListener( 'play', function()
			{
				$( 'audio[data-playing=true]' ).each(function() {
					this.pause();
				});
				$( theAudio ).attr( 'data-playing', 'true' );
				playPause.attr( 'title', params.strPause ).find( 'a' ).html( params.strPause );
				thePlayer.addClass( cssClass.playing );
			});

			theAudio.addEventListener( 'pause', function()
			{
				$( theAudio ).removeAttr( 'data-playing' );
				playPause.attr( 'title', params.strPlay ).find( 'a' ).html( params.strPlay );
				thePlayer.removeClass( cssClass.playing );
			});

			thePlayer.find( '.' + cssClass.playPause ).on( 'click', function()
			{
				theAudio.paused ? theAudio.play() : theAudio.pause();
				return false;
			});

			$this.replaceWith( thePlayer );
		});
		return this;
	};



	$( 'audio' ).audioPlayer();

});

responsive-audio-player.php

<?php
/*
  Plugin Name: Responsive Audio Player
	Description: WordPress plugin for http://osvaldas.info/audio-player-responsive-and-touch-friendly. 
	             Usage: [resp-player width="50%" mp3="http://example.com/file.mp3"]
	Version: 0.1
	Author: Rodolfo Buaiz 
	Author URI: http://www.rodbuaiz.com
*/
add_shortcode( 'resp-player', 'b5f_responsive_audio_shortcode' );
add_action( 'wp_enqueue_scripts', 'b5f_enqueue_shortcode_scripts' );
add_action( 'wp_default_scripts', 'ds_enqueue_jquery_in_footer' );

function b5f_responsive_audio_shortcode($atts) 
{
	$width = isset( $atts['width'] ) ? " style='width:{$atts['width']}'" : '';
	$mp3 = isset( $atts['mp3'] ) ? '<source src="' . $atts['mp3'] .'" />' : '';
	$ogg = isset( $atts['ogg'] ) ? "<source src='{$atts['ogg']}' />" : '';
	$wav = isset( $atts['wav'] ) ? "<source src='{$atts['wav']}' />" : ''; 	
	?>
	<div<?php echo $width; ?>>
		<audio controls preload="auto">
			<?php echo $mp3; ?>
			<?php echo $ogg; ?>
			<?php echo $wav; ?>
			This text displays if the audio tag isn't supported.
		</audio>
	</div>
	<?php
}

function b5f_enqueue_shortcode_scripts()
{
	if( b5f_post_has_shortcode( 'resp-player' ) )
	{
		wp_enqueue_style( 'resp-player-css', plugins_url( 'audio-player.css', __FILE__) );
		wp_enqueue_script( 'resp-player-js', plugins_url( 'audio-player.js', __FILE__), array('jquery'), false, true );
	}
}


/**
 * Description: Prints jQuery in footer on front-end.
 * Author:      Dominik Schilling
 * Author URI:  http://wpgrafie.de/
 */
function ds_enqueue_jquery_in_footer( &$scripts ) {
	 
	if ( ! is_admin() )
		$scripts->add_data( 'jquery', 'group', 1 );
}


function b5f_post_has_shortcode($shortcode = '') 
{  
    $post_to_check = get_post(get_the_ID());  
    $found = false;  
    if (!$shortcode) 
        return $found;  
    
    if ( stripos($post_to_check->post_content, '[' . $shortcode) !== false ) 
        $found = true;  
    
    return $found;  
}