php - Initialize variables that are not called from POST -


i learning how code php , have 2 pages: rates.html , rates.php. our assignment has need run rates.php , no longer need use rates.html. way of going around problem follows:

if (empty($_post['txtinput'])){     $inputcurrency = 0;     $outputcurrency = 0;     $txtinput = ''; } else {     $inputcurrency = $_post['inputcurrency'];     $outputcurrency = $_post['outputcurrency'];     $txtinput = $_post['txtinput']; }

input , output currencies made in form of drop down list, , txtinput number user wants convert.

the problem page throws error message when user submits form without input in field. page loads following code:

if ( empty($txtinput) ) {     $error_message = 'input required field.'; } else if ( !is_numeric($txtinput) )  {     $error_message = 'input must valid number.'; } else if ( $txtinput <= 0 ) {     $error_message = 'input must greater zero.'; } else {     $error_message = ''; }

is there way flag not thrown on pages first load? appreciated

wrap logic should run when form submitted in if block checks see if form submitted via post:

if ('post' === $_server['request_method']) {     // form submitted.  put form logic here. }

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