Mostrar anuncios adaptativos según dispositivo de visita

<?php if(wp_is_mobile()){ ?>
Code mobil
<?php }else { ?>
code PC
<?php } ?>

	function publiContenido($content){
		$poses = array();
		$lastpos = -1;
		$repchar = "<p";
		if(strpos($content, "<p") === false)
			$repchar = "<br";

		while(strpos($content, $repchar, $lastpos+1) !== false){
			$lastpos = strpos($content, $repchar, $lastpos+1);
			$poses[] = $lastpos;
		}

		$half = sizeof($poses);
		$adsperpost = $ai_adsused+1;
		if(!is_single())
			$half = sizeof($poses)/2;

		while(sizeof($poses) > $half)
			array_pop($poses);

		$pickme = 0;
		while($pickme==0){
			$pickme = $poses[rand(0, sizeof($poses)-1)];
		}


		$replacewith = '<center>CODEADSENSE</center>';
    
		$content = substr_replace($content, $replacewith.$repchar, $pickme, 2);

		return $content;
	}
	add_filter("the_content", "publiContenido");