If statement checking for submission (PHP)

Question

I am trying to create a simple payment.php file that handles form posting from a buyaticket.html file.

I need to write an if statement, so that the website will display this:`

<h1>Thanks, customer!</h1>
<p>Your information has been recorded.</p>


<dl>
    <dt>Name:</dt>
    <dd><?php print $_POST['name']; ?></dd>
    <dt>Seat:</dt>
    <dd><?php print $_POST['seats']; ?></dd>
    <dt>Credit Card Type:</dt>
    <dd><?php print $_POST['cardtype']; ?></dd>
    <dt>Credit Card Number:</dt>
    <dd><?php print $_POST['creditcardnumber']; ?></dd>
</dl>`

if all of the names (name, seats, cardtype, creditcardnumber) are filled out. In addition, the creditcardnumber must be an int.

if they are not filled out (i.e. empty or null), then i need to display a simple html tag stating that you haven't filled out the form correctly.

Can anyone help me with my problem? I need to know how to write an IF statement that will show an error message if the inputs (name, credit card number, etc) are left blank, and if they are filled out i will show the above mentioned code showing all of the users input information.

this is what i was playing with (not my actual code. just thoughts):

if empty('name') or empty('cardtype') or empty('seats') or empty('creditcardnumber') 
  <h1>You have filled out the form incorrectly</h1>
else
  <dl>
  </dl?

but i don't know how to check for creditcardnumber being an integer, as well.

Thanks in advance for any help!

So what you're saying is that you haven't gotten around to reading the PHP manual or a PHP book yet? — Lightness Races in Orbit, Apr 16 '13 at 15:48
@Andy: Except that's not the name of any of the pertinent variables. — Lightness Races in Orbit, Apr 16 '13 at 15:49
_creditcardnumber must be an int_. creditcardnumber may be all digits, but it's certainly no `int`. — Halcyon, Apr 16 '13 at 15:49
@LightnessRacesinOrbit is on the right track. Try reading books and documentation, they're magical. — Leng, Apr 16 '13 at 15:50
seems to be another question that should be tagged with `homework` — bizzehdee, Apr 16 '13 at 15:56
@bizzehdee: There are no questions on Stack Overflow that should be tagged with `homework`, which is a _deprecated_ tag (read its wiki). It was deprecated because all posts within it should either be improved, or closed altogether. Like this one. — Lightness Races in Orbit, Apr 16 '13 at 16:02

score 1 · Answer 1 · edited May 23 '17 at 11:43

1

Never check an creditcard number with is_numeric but with the checksum and pattern.

Here is a great answer: What is the best way to validate a credit card in PHP?

edited May 23 '17 at 11:43

Community

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1

answered Apr 16 '13 at 15:54

S.Visser

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score 0 · Answer 2 · answered Apr 16 '13 at 15:49

0

Check is_numeric() That's the function you need. http://www.php.net/manual/en/function.is-numeric.php

answered Apr 16 '13 at 15:49

frisco

1,897
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score 0 · Answer 3 · answered Apr 16 '13 at 15:52

0

You can check weather creditcard number is integer with function

is_numeric

answered Apr 16 '13 at 15:52

Jakuje

24,773
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score 0 · Answer 4 · answered Apr 16 '13 at 15:53

0

if (isset($_POST['name']) && isset($_POST['name']) && isset($_POST['cardtype']) && isset($_POST['cardtype']) && isset($_POST['creditcardnumber']) && is_int($_POST['creditcardnumber']))
{echo('good job');}
else {echo('bad job');}

answered Apr 16 '13 at 15:53

user1032531

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thank you all for your help. does this statement sound like it would work: `if (!empty($_POST['name']) && !empty($_POST['seats']) && !empty($_POST['creditcardnumber']) && !empty($_POST['cardtype']) && (is_int($_POST['creditcardnumber'])==True){` – Jack Apr 17 '13 at 15:54

score 0 · Answer 5 · answered Apr 16 '13 at 16:00

You may simply write

<?php

if($_POST['name'] && $_POST['seats'] && $_POST['cardtype'] && $_POST['creditcardnumber']){

//your action for displaying input

}else{
?>
<h1>You have filled out the form incorrectly</h1>
<?php
}

?>

Although I suggest to put include a name to your submit button to verify if the form was really submitted. Lets say your submit button's name is 'submit'.

    <?php

    if($_POST['submit']){

    //your validation code
     if($_POST['name'] && $_POST['seats'] && $_POST['cardtype'] && $_POST['creditcardnumber']){
    ...
    }else{
    //prompt user for incomplete fields
    }

    } 
?>

If statement checking for submission (PHP)

5 Answers5