wordpress - Cant get php to work inside shortcode content -

i tried several solutions looking @ similar questions within site won't work me. =( please help.

this excerpt original code:

<form action="" method="get"> <input type="text" name="search" value=""> <input type="submit" value="search"> <?php echo do_shortcode('[expand] <input type="checkbox" name="title" <?php if(isset($_get['title'])) echo "checked='checked'"; ?>>     <label for="ti">title</label></td> [/expand]'); ?> </form> 

basically, want checkboxes remain checked, if checked before hitting submit. unfortunately, it's been hours , can't php work inside shortcode.

please help.

your can try this,

<form action="" method="get">     <input type="text" name="search" value="">     <input type="submit" value="search">     <?php       $check=isset($_get['title']) ? "checked='checked'" : '';      echo do_shortcode('[expand]      <input type="checkbox" name="title" '.$check.' ><label for="ti">title</label></td>      <input type="submit" value="search">      [/expand]');      ?> </form>