How can I put this php into this html? -

so have following php:

    $latest_cpt = get_posts("post_type=event&numberposts=1");  $theidone =$latest_cpt[0]->id; $this_post_id =  $theidone; //get_the_id(); $key_2_value =  get_post_meta( $this_post_id, 'custom_select', true ); if( ! empty( $key_2_value )) { $thisisworking =   $key_2_value ;  ;} 

i need put php code above '.$thisisworking.' below. keep getting semi colon unexpected php errors when try.

div id="indent">  <span style="font-size:0.2em">     <h2><?php echo $em_category->output('#_categoryname'); ?></h2>     </span>     <?php echo $em_category->output('#_categorynotes'); ?></p>     <p> <?php //echo $em_category->output('#_categoryallevents'); ?>  </p>       <?php echo em_events::output( array('format'=> ' <li> <br /> <span style="color: #ed834e; clear:both;  display:block"> '.$thisisworking.'#_eventname </span>   </li> <br /> <b>  <li> 

can tell me how can achieved?

echo em_events::output( array('format'=> how wordpress plugin author, says templates modify wordpress plugin should coded. can please?

update: tried doesn't seem make difference:

function letsmakethiswork()  {      $latest_cpt = get_posts("post_type=event");      foreach ( $latest_cpt $cpt_post ) {         $theidone =$cpt_post->id;         $this_post_id =  $theidone; //get_the_id();         $key_2_value =  get_post_meta( $this_post_id, 'custom_select', true );         if( ! empty( $key_2_value )) {             $thisisworking =   $key_2_value ;         }         return $key_2_value;     } }     // end of new category system  ?>  <div id="indent">  <span style="font-size:0.2em">     <h2><?php echo $em_category->output('#_categoryname'); ?></h2>     </span>     <?php echo $em_category->output('#_categorynotes'); ?></p>     <p> <?php //echo $em_category->output('#_categoryallevents'); ?>  </p>       <?php echo em_events::output( array('format'=> ' <li> <br /> <span style="color: #ed834e; clear:both;  display:block"> '.letsmakethiswork().'#_eventname </span>   </li> <br /> <b>  <li> 

turn function?

function foo() {     ... mangled code ...    return $whatever_you_built; }  $string = "foo bar " . foo() . " baz qux";