php - Using session to return message only returns one message -

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so have sign form. 1 register.php, actual form. , other r.php, process it. use sessions send error message r.php register.php. issue reason can figure out how display one 

if($name === ''){     $_session['name_req'] = 'make sure enter name';     header('location: register.php');     exit(); } elseif($name > 255){     $_session['name_len'] = 'enter shorter name';     header('location: register.php');     exit() }

this code sends message register.php display error 

<?php echo isset($_session['name_req']) ? $_session['name_req'] : '';?>

the issue if it'll display 1 error @ time , want display of them @ once. ideas?

with code supply, page redirects if 1 error found, try instead:

if(isset($_post['submitbuttonname']) && $_post['submitbuttonname'] == "submitbuttonvalue") {     if($name === ''){         $_session['name_req'] = 'make sure enter name';     }     if($name > 255){         $_session['name_len'] = 'enter shorter name';     }      header('location: register.php');     exit(); }

but if use javascript submit form, submit button won't work, instead can use hidden input whatever name , value want.


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