scope - Global error message in php -

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i have problem understanding of variable scopes.

i've got huge .php file many $_post validations (i know isn't not practise). anyways want little html-part above code outputs error message. message want change in every $_post validation function.

example:

if($err) {     echo '<div class="error-message">'.$err.'</div>'; }

now functions following in same file.

if(isset($_post['test']) {     $err = 'error!'; }  if(isset($_post['test2'] {     $err = 'error 2!'; }

but doesn't work. think there's huge missunderstanding , i'm ashamed. can me?

i didnt catch question maybe answer:

<body>    <p id="error_message">      <?php if(isset($err)){echo $err;} ?>    </p>  </body>

and suggest learn how work sessions. , should know $_post empty on each refresh or f5


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