How to multiply

[Bayliss Trevor]

How do I multiply this variable which I am successfully outputting $fconversionRate

with this form field

$_GET['ValuetoConvert']

You can see how I am outputting $fconversionRate at the moment at the end of the code below. Thank you very much:

<?php  require_once 'lib/nusoap.php';  $oClient   = new nusoap_client(     'http://www.webservicex.net/CurrencyConvertor.asmx?WSDL',     TRUE // Needs to be TRUE because we are using WSDL ); $oResponse = $oClient->call(     'ConversionRate',     array(         'FromCurrency' => $_GET['FromCurrency'],         'ToCurrency'   => $_GET['ToCurrency']     ) );  $fConversionRate = (float) $oResponse['ConversionRateResult']; echo $fConversionRate; ?>

[Cups]

Why dont you post the exact results of doing this :

var_dump( $fConversionRate );

and the exact results of this:

var_dump( $_GET['ValuetoConvert'];

Then someone may be able to help you.

[Bayliss Trevor]

Ok ill do that

[Bayliss Trevor]

The exact results of this:

var_dump( $fConversionRate );


are NULL

var_dump( $_GET['ValuetoConvert']);


are NULL

[spikeZ]

something like:

require_once 'lib/nusoap.php';  
$oClient   = new nusoap_client(
    'http://www.webservicex.net/CurrencyConvertor.asmx?WSDL',     
    TRUE // Needs to be TRUE because we are using WSDL 
);

$oResponse = $oClient->call(
    'ConversionRate',     
    array(
        'FromCurrency' => $_GET['FromCurrency'],         
        'ToCurrency'   => $_GET['ToCurrency'] 
    ) 
);  

$fConversionRate = (float) $oResponse['ConversionRateResult']; 
$result = $fConversionRate * isset($_GET['ValuetoConvert']) ? $_GET['ValuetoConvert'] : 0;
echo $fConversionRate;
echo $result; 

should work.

[Bayliss Trevor]

Thanks Spike it outputs the conversion rate on the action page but it doesn't do the multiplication. The results of the following var_dumping:

var_dump( $fConversionRate );
var_dump( $_GET['ValuetoConvert']); 

is:

float(1.1857) NULL

It seems as if maybe the value isn't being passed from the form.php ValueToConvert field? Why is this not working? Thank-you

Form.php

<?php
require_once 'lib/nusoap.php';

$oClient   = new nusoap_client(

    'http://www.webservicex.net/CurrencyConvertor.asmx?WSDL',

    TRUE // Needs to be TRUE because we are using WSDL

);

?>


<form action="action.php" method="get">
<p>
Convert from:
<select name="FromCurrency">
<option value="USD">UnitedStatesDollar</option>
</select>
</p>

<p>
convert to:
<select name="ToCurrency">
<option value="CAD">CanadianDollar</option>
</select>
</p>

Value to convert:<input type="text" name="ValueToConvert" /><br />

<input type="submit" />

 </form>

Action.php

<?php

require_once 'lib/nusoap.php';

$oClient   = new nusoap_client(
    'http://www.webservicex.net/CurrencyConvertor.asmx?WSDL',
    TRUE // Needs to be TRUE because we are using WSDL
);
$oResponse = $oClient->call(
    'ConversionRate',
    array( 
        'FromCurrency' => $_GET['FromCurrency'],
        'ToCurrency'   => $_GET['ToCurrency']
    )
);


$fConversionRate = (float) $oResponse['ConversionRateResult']; $result = 

$fConversionRate * isset($_GET['ValuetoConvert']) ? $_GET['ValuetoConvert'] : 0;echo 

$fConversionRate;echo $result;  

?>

[spikeZ]

hmm add the following to your var_dump area

print_r($_GET); 

and see what is being sent through, paste the results.

[Bayliss Trevor]

float(1.1857) NULL Array ( [FromCurrency] => USD
[ToCurrency] => CAD
[ValueToConvert] => 30 )

[spikeZ]

ah-ha, this is one of those really REALLY annoying errors!

ValueToConvert is different to ValuetoConvert - note the capital T!

<?php

require_once 'lib/nusoap.php';

$oClient   = new nusoap_client(
    'http://www.webservicex.net/CurrencyConvertor.asmx?WSDL',
    TRUE // Needs to be TRUE because we are using WSDL
);
$oResponse = $oClient->call(
    'ConversionRate',
    array( 
        'FromCurrency' => $_GET['FromCurrency'],
        'ToCurrency'   => $_GET['ToCurrency']
    )
);


$fConversionRate = (float) $oResponse['ConversionRateResult']; 
$result = $fConversionRate * isset($_GET['ValueToConvert']) ? $_GET['ValueToConvert'] : 0;
echo $fConversionRate;
echo $result;  

?>

[Cups]

Now, how do you know that 30 represents 30 cents or 30 dollars?

Signal clearly on your gui.

[Bayliss Trevor]

Right php it is strongly typed! I didn't realize that. Thanks cups I now added that in on the form.
The sum doesn't seem to happen though if I convert 30 from USD to CAD then I get 1.185710 on the action page-it should be 1.185710 *30 I think.
Why is that happenig? Thanks

<?php

require_once 'lib/nusoap.php';

$oClient   = new nusoap_client(
    'http://www.webservicex.net/CurrencyConvertor.asmx?WSDL',
    TRUE // Needs to be TRUE because we are using WSDL
);
$oResponse = $oClient->call(
    'ConversionRate',
    array( 
        'FromCurrency' => $_GET['FromCurrency'],
        'ToCurrency'   => $_GET['ToCurrency']
    )
);


$fConversionRate = (float) $oResponse['ConversionRateResult']; $result = 

$fConversionRate * isset($_GET['ValueToConvert']) ? $_GET['ValueToConvert'] : 0;
echo $fConversionRate;
echo $result;  


?>

[Bayliss Trevor]

Why is this part

$fConversionRate = (float) $oResponse['ConversionRateResult']; 
$result =  $fConversionRate * isset($_GET['ValueToConvert']) ? $_GET['ValueToConvert'] : 0; 
echo $fConversionRate; echo $result; 

not

$fConversionRate = (float) $oResponse['ConversionRateResult']; 
$result =  $fConversionRate *  $_GET['ValueToConvert'] ;
echo $result; 

Thanks

[Bayliss Trevor]

That works! thanks for all the help with my first php coding!

[Cups]

Why is this part

He was showing you how to use the Ternary Operator in PHP - making sure the $_GET value was set.

if( this is true ) ? do this : do that ;

equivalent to:

if( this is true ) {
do this ;
} else {
do that ;
}

[Bayliss Trevor]

Ah ok Cups, I thought it was something like that. However, it didn't work.