Calling a particular PHP function on form submit

Question

I was trying to call a particular php function in submit of a form both the form and php scripts are in same page. My code is below.(it is not working and so I need help)

<html>
    <body>
    <form method="post" action="display()">
        <input type="text" name="studentname">
        <input type="submit" value="click">
    </form>
    <?php
        function display()
        {
            echo "hello".$_POST["studentname"];
        }
    ?>
    </body>
</html>

The Alpha · Accepted Answer · 2016-11-06T11:51:44.900

80

In the following line

<form method="post" action="display()">

the action should be the name of your script and you should call the function, Something like this

<form method="post" action="yourFileName.php">
    <input type="text" name="studentname">
    <input type="submit" value="click" name="submit"> <!-- assign a name for the button -->
</form>

<?php
function display()
{
    echo "hello ".$_POST["studentname"];
}
if(isset($_POST['submit']))
{
   display();
} 
?>

edited Nov 06 '16 at 11:51

answered Sep 08 '12 at 05:49

The Alpha

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Error : The requested URL /path/to/update() was not found on this server. – Madan Bhandari Nov 02 '16 at 13:12
@MadanBhandari Don't write the name of function in the method of the form. – Siraj Alam Jun 03 '18 at 17:07
If you write name of function in action, it looks the this in root directory and didn't go to if(isset) statement. Kindly remove the function name. – Salman Mushtaq Feb 25 '20 at 06:34
1

@SalmanMushtaq, have you read the answer properly, the function name is not in action, `
`.
– The Alpha Feb 25 '20 at 12:55

score 10 · Answer 2 · answered Sep 08 '12 at 05:54

10

you don't need this code

<?php
function display()
{
echo "hello".$_POST["studentname"];
}
?>

Instead, you can check whether the form is submitted by checking the post variables using isset.

here goes the code

if(isset($_POST)){
echo "hello ".$_POST['studentname'];
}

click here for the php manual for isset

answered Sep 08 '12 at 05:54

kushalbhaktajoshi

4,640
3
22
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1

Wouldn't this execute the function on refreshing the page? Not that on this case is dangerous, but I am doing a save function. – Tyrannogina Sep 19 '16 at 11:18
This will echo null values when refreshing, better use isset($_POST['submit'] – lisandro Jan 11 '20 at 12:13

score 6 · Answer 3 · edited May 20 '16 at 00:10

Assuming that your script is named x.php, try this

<?php 
   function display($s) {
      echo $s;
   }
?>
<html>
    <body>
        <form method="post" action="x.php">
            <input type="text" name="studentname">
            <input type="submit" value="click">
        </form>
        <?php
           if($_SERVER['REQUEST_METHOD']=='POST')
           {
               display();
           } 
        ?>
    </body>
</html>

score 2 · Answer 4 · answered Sep 08 '12 at 05:47

PHP is run on a server, Your browser is a client. Once the server sends all the info to the client, nothing can be done on the server until another request is made.

To make another request without refreshing the page you are going to have to look into ajax. Look into jQuery as it makes ajax requests easy

score 0 · Answer 5 · answered Sep 08 '12 at 05:49

If you want to call a function on clicking of submit button then you have
to use ajax or jquery,if you want to call your php function after submission of form you can do that as :

<html>
<body>
<form method="post" action="display()">
<input type="text" name="studentname">
<input type="submit" value="click">
</form>
<?php
function display()
{
echo "hello".$_POST["studentname"];
}
if($_SERVER['REQUEST_METHOD']=='POST')
{
       display();
} 
?>
</body>
</html>

score 0 · Answer 6 · answered Mar 11 '17 at 09:54

Write this code

<?php
    if(isset($_POST['submit'])){
        echo 'Hello World';
    } 
?>

<html>
     <body>
         <form method="post">
             <input type="text" name="studentname">
             <input type="submit" name="submit" value="click">
         </form>
     </body>
</html>

score 0 · Answer 7 · answered Dec 05 '20 at 13:48

An alternative, and perhaps a not so good procedural coding one, is to send the "function name" to a script that then executes the function. For instance, with a login form, there is typically the login, forgotusername, forgotpassword, signin activities that are presented on the form as buttons or anchors. All of these can be directed to/as, say,

weblogin.php?function=login
weblogin.php?function=forgotusername
weblogin.php?function=forgotpassword
weblogin.php?function=signin

And then a switch statement on the receiving page does any prep work and then dispatches or runs the (next) specified function.

Calling a particular PHP function on form submit

7 Answers7

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