issue with simple currency conversion with php -


i cant value of selected currency converted properly. did correctly set array?

<?php      $amount_input = filter_input(input_post, 'amount_input');     $currency1 = filter_input(input_post, 'currency_type_from');     $currency2 = filter_input(input_post, 'currency_type_to');       $currencies = array();      $currencies['gbp'] = array(         'gbp' => 1,         'eur' => 1.09710,         'usd' => 1.28917     );     $currencies['eur'] = array(         'eur' => 1,         'gbp' => 0.911383,         'usd' => 1.17616     );      $currencies['usb'] = array(         'usd' => 1,         'eur' => 0.849851,         'gbp' => 0.774699     );      $currencies = 0; // when comment undefined index @ line below      $amount_output = $amount_input*$currencies[$currency1][$currency2];      ?>

form convert currency select type

 <form action="converter.php" method="post">                       <select name="currency_type_from" class="form-control">            <option value="eur">eur</option>           <option value="gbp">gbp</option>           <option value="usd">usd</option>       </select>           <input name="amount_input" type="text"/>        <select name="currency_type_to" class="form-control">            <option value="eur">eur</option>           <option value="gbp">gbp</option>           <option value="usd">usd</option>       </select>       <input name="amount_output" type="text" value="<?php echo $amount_output; ?>" /> // value not being input converted here?        <input type="submit" name="submit" value="convert"></input>          </form>

may undefined index error if $currencies = 0; comment

do following

1) if want output on same page, don't add action(of form) of second page. leave empty.

2) add php code before form can convered value

<?php $amount_output = ""; $amount_input = ""; if($_post) {   $amount_input = filter_input(input_post, 'amount_input');     $currency1 = filter_input(input_post, 'currency_type_from');     $currency2 = filter_input(input_post, 'currency_type_to');       $currencies = array();      $currencies['gbp'] = array(         'gbp' => 1,         'eur' => 1.09710,         'usd' => 1.28917     );     $currencies['eur'] = array(         'eur' => 1,         'gbp' => 0.911383,         'usd' => 1.17616     );      $currencies['usb'] = array(         'usd' => 1,         'eur' => 0.849851,         'gbp' => 0.774699     );      $amount_output = $amount_input*$currencies[$currency1][$currency2];     } ?> <form action="" method="post">                       <select name="currency_type_from" class="form-control">            <option value="eur">eur</option>           <option value="gbp">gbp</option>           <option value="usd">usd</option>       </select>           <input name="amount_input" type="text" value="<?php echo $amount_input; ?>"/>        <select name="currency_type_to" class="form-control">            <option value="eur">eur</option>           <option value="gbp">gbp</option>           <option value="usd">usd</option>       </select>     <input name="amount_output" type="text" value="<?php echo $amount_output; ?>" />        <input type="submit" name="submit" value="convert"></input>  </form>

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