php - Deschifer this bit of code please -


what following bit of code mean in "english"?

just started learning php & codeigniter , cant seem make sense of it.

<meta name="description" content="<?if (isset($contentdata) && isset($contentdata->description)):?><?=$data->description?><?=$contentdata->description?><?endif;?>" />

as far understand, gets info database, i'm not sure how, or why 2 conditions must true (&&). 

//if there's variable $contentdata , has property ->description <?if (isset($contentdata) && isset($contentdata->description)):?>  //shorthand syntax <?php echo $data->description ?> <?=$data->description?>  //shorthand syntax <?php echo $contentdata->description ?> <?=$contentdata->description?>

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