[Resolved] Calling a PHP Function in a Form

[culpable]

Hi,

I am trying to convert a page that was entirely coded in PHP into a page on a conventional “wordpress page”.

To do this I have added a HTML block on a wordpress page with all of my HTML code.

I have used simple CSS to add the CSS specific to my page.

Now the PHP – my code calls the PHP function in a form via:

<form action=”submitvoltage.php” method=”post” id=”myForm3″>

Where can I put this “submitvoltage.php” function so that it will be correctly called?

Can I add the code via an Elements hook that only displays on this page? e.g. -> https://i.imgur.com/Mw935GN.png

Thank you in advance for your help 🙂

[Tom]

You should be able to add that to Elements, but you might need to adjust the action so it has the full URL to submitvoltage.php.

[culpable]

Sorry for the late reply Tom.

After a lot of troubleshooting, I’m still a bit stuck.

Using “submitresistance.php” as an example, this is the code right now:

$voltage=0;
$voltageunit ="";
$current=0;
$currentunit ="";
$resistance=0;
$resistanceunit="";
$power=0;
$powerunit="";
if((!empty($_POST['voltage1'])) && (!empty($_POST['current1']))){
$voltage = $_POST['voltage1'];
$voltageunit = $_POST['voltageunit1']; 
if($voltageunit =="volt"){$voltage=1*$voltage;}else{if($voltageunit =="mili volt"){$voltage=0.001*$voltage;}else{if($voltageunit =="kilo volt"){$voltage=1000*$voltage;}}}
$current = $_POST['current1'];
$currentunit = $_POST['currentunit1'];
if($currentunit =="ampere"){$current=1*$current;}else{if($currentunit =="mili ampere"){$current=0.001*$current;}else{if($currentunit =="kilo ampere"){$current=1000*$current;}}}
$resistance=$voltage/$current;
if($resistance>999999){$resistance=$resistance/1000000;$resistanceunit="MΩ";}else{if($resistance>999){$resistance=$resistance/1000;$resistanceunit="KΩ";}else{$resistance=$resistance/1;$resistanceunit="Ω";}}
$power=$voltage*$current;
if($power>999999){$power=$power/1000000;$powerunit="MW";}else{if($power>999){$power=$power/1000;$powerunit="KW";}else{$power=$power/1;$powerunit="W";}}
echo number_format((float)$resistance, 4, '.', '');
echo $resistanceunit;
echo number_format((float)$power, 4, '.', '');
echo $powerunit;
}else{echo "<h3 class='errormessage'>Please enter non zero voltage and current value</h3>";}

No need to get into the details… but essentially I’m thinking that how can my code know where to find and call this “submitresistance.php” if it is not named as a file when it is on the page via “Elements -> Hooks -> Execute PHP”.

Would this require me converting the above into a PHP function, and then submitting the form to that function?

Sorry for my ignorance on the matter. I’m just trying to extrapolate from other programming languages I’ve worked in.

[Tom]

That file would need to exist somewhere on your server – it can’t be added using a hook.

You can add it to a child theme, and then link your form action to the file.

[culpable]

Thanks for your help Tom.

I made a child theme and added the file in the same folder as my child theme’s function.php file: https://i.imgur.com/XhVzxog.png

I also changed the “submit” to add a “/” to take it from the root: https://i.imgur.com/AHDxQ3E.png

But from the above error, I presume that I am pointing at the wrong place?

[culpable]

Hmmm so I added the above PHP code in full to a ‘submitresistance.php’ file which I added to my root directory.

<?php
$voltage=0;
$voltageunit ="";
$current=0;
$currentunit ="";
$resistance=0;
$resistanceunit="";
$power=0;
$powerunit="";

if((!empty($_POST['voltage1'])) && (!empty($_POST['current1']))){
$voltage = $_POST['voltage1'];
$voltageunit = $_POST['voltageunit1']; 
if($voltageunit =="volt"){$voltage=1*$voltage;}else{if($voltageunit =="mili volt"){$voltage=0.001*$voltage;}else{if($voltageunit =="kilo volt"){$voltage=1000*$voltage;}}}
$current = $_POST['current1'];
$currentunit = $_POST['currentunit1'];
if($currentunit =="ampere"){$current=1*$current;}else{if($currentunit =="mili ampere"){$current=0.001*$current;}else{if($currentunit =="kilo ampere"){$current=1000*$current;}}}
$resistance=$voltage/$current;
if($resistance>999999){$resistance=$resistance/1000000;$resistanceunit="M&ohm;";}else{if($resistance>999){$resistance=$resistance/1000;$resistanceunit="K&ohm;";}else{$resistance=$resistance/1;$resistanceunit="&ohm;";}}
$power=$voltage*$current;
if($power>999999){$power=$power/1000000;$powerunit="MW";}else{if($power>999){$power=$power/1000;$powerunit="KW";}else{$power=$power/1;$powerunit="W";}}

?>
<div>Resestance<div><div><?php echo number_format((float)$resistance, 4, '.', '');?></div><div><?php echo $resistanceunit;?></div></div></div>

<div>Power<div><div><?php echo number_format((float)$power, 4, '.', '');?></div><div><?php echo $powerunit;?></div></div></div>
<?php
}else{echo "<h3 class='errormessage'>Please enter non zero voltage and current value</h3>";}
?>

I then altered the form to point at the root…. i.e. “/submitresistance.php”.

It is no longer throwing a “not found” error. But it looks like it’s evaluating the “else” part of the statement above and is just showing the <h3> part.

Then is also carrying across onto the page itself when I hit “calculate”, as seen here: https://imgur.com/a/BpnI4il

I’m stumped as to why this works on a non-wordpress install (calling the script “submitresistance.php”) but in this case, it’s not working. Aren’t the situations analogous?

If you have any ideas Tom, they would be very much appreciated.

[Tom]

Since the file isn’t in the root directory (you could move it there, though), you’d need to add the full URL to the file: yoursite.com/wp-content/themes/generatepress_child/yourfile.php

[culpable]

You’re too great Tom.

Working! Thank you 🙂

[Tom]

You’re welcome 🙂

[Author]

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