How to call a PHP function on the click of a button

Question

I have created a page called functioncalling php that contains two buttons  Submit and Insert  I want to test which function is executed when a button gets clicked  I want the output to appear on the same page  So  I created two functions  one for each button   lt form action  quot functioncalling php quot  gt       lt input type  quot text quot  name  quot txt quot    gt       lt input type  quot submit quot  name  quot insert quot  value  quot insert quot  onclick  quot insert   quot    gt       lt input type  quot submit quot  name  quot select quot  value  quot select quot  onclick  quot select   quot    gt   lt  form gt    lt  php     function select            echo  quot The select function is called  quot             function insert            echo  quot The insert function is called  quot           gt   The problem here is that I don t get any output after any of the buttons are clicked  Where exactly am I going wrong

User · Answer

You should make the button call the same page and in a PHP section check if the button was pressed:

HTML:

<form action="theSamePage.php" method="post">
    <input type="submit" name="someAction" value="GO" />
</form>

PHP:

<?php
    if($_SERVER['REQUEST_METHOD'] == "POST" and isset($_POST['someAction']))
    {
        func();
    }
    function func()
    {
        // do stuff     
    }
?>

User · Answer

Calling a PHP function using the HTML button  Create an HTML form document which contains the HTML button  When the button is clicked the method POST is called  The POST method describes how to send data to the server  After clicking the button  the array key exists   function called   lt  php     if array key exists  button1     POST              button1                else if array key exists  button2     POST              button2                function button1              echo  quot This is Button1 that is selected quot               function button2              echo  quot This is Button2 that is selected quot             gt     lt form method  quot post quot  gt        lt input type  quot submit quot  name  quot button1 quot  class  quot button quot  value  quot Button1 quot    gt        lt input type  quot submit quot  name  quot button2 quot  class  quot button quot  value  quot Button2 quot    gt    lt  form gt    source  geeksforgeeks org

User · Answer

Here is an example which you could use    lt html gt       lt body gt           lt form action  btnclick php  method  get  gt               lt input type  submit  name  on  value  on  gt               lt input type  submit  name  off  value  off  gt           lt  form gt       lt  body gt   lt  html gt   lt  php     if isset   GET  on               onFunc              if isset   GET  off               offFunc               function onFunc            echo  Button on Clicked             function offFunc            echo  Button off clicked           gt

User · Answer

Button clicks are client side whereas PHP is executed server side  but you can achieve this by using Ajax       button   click function         ajax       type   POST       url   some php       data    name   John         done function  msg         alert   Data Saved      msg                In your PHP file    lt  php     function abc  name              Your code here         gt

User · Answer

You can simply do this  In php  you can determine button click by use of if isset   Post  button tag name     echo  quot Button Clicked quot      Therefore you should modify you code as follows    lt  php  if isset   Post  select      echo  quot select button clicked and select method should be executed quot     if isset   Post  insert      echo  quot insert button clicked and insert method should be executed quot                           gt    lt  DOCTYPE html PUBLIC  quot -  W3C  DTD XHTML 1 0 Transitional  EN quot   quot http   www w3 org TR xhtml1 DTD xhtml1-transitional dtd quot  gt   lt html gt       lt body gt           lt form action  quot functioncalling php quot  gt               lt input type  quot text quot  name  quot txt quot    gt               lt input type  quot submit quot  name  quot insert quot  value  quot insert quot  onclick  quot insert   quot    gt               lt input type  quot submit quot  name  quot select quot  value  quot select quot  onclick  quot select   quot    gt           lt  form gt    lt script gt    This will be processed on the client side function insert      window alert  quot You click insert button quot       function select      window alert  quot You click insert button quot       lt  script gt   lt  body gt   lt  html gt

User · Answer

I was stuck in this and I solved it with a hidden field    lt form method  post  action  test php  gt       lt input type  hidden  name  ID  value   gt   lt  form gt    In value you can add whatever you want to add   In test php you can retrieve the value through   Post ID

User · Answer

Use a recursive call where the form action calls itself   Then add PHP code in the same form to catch it   In foo php your form will call foo php on post   lt html gt       lt body gt           lt form action  foo php  method  post  gt    Once the form has been submitted it will call itself  foo php  and you can catch it via the PHP predefined variable   SERVER as shown in the code below    lt  php     if    SERVER  REQUEST METHOD       POST             echo  caught post           gt           lt  form gt       lt  body gt   lt  html gt

User · Answer

The onclick attribute in HTML calls JavaScript functions  not PHP functions

User · Answer

Yes  you need Ajax here  Please refer to the code below for more details    nbsp   Change your markup like this   lt input type  submit  class  button  name  insert  value  insert    gt   lt input type  submit  class  button  name  select  value  select    gt     nbsp   jQuery     document  ready function            button   click function            var clickBtnValue     this  val            var ajaxurl    ajax php           data      action   clickBtnValue             post ajaxurl  data  function  response                   Response div goes here              alert  action performed successfully                              In ajax php   lt  php     if  isset   POST  action               switch    POST  action                  case  insert                   insert                    break              case  select                   select                    break                       function select             echo  The select function is called            exit             function insert             echo  The insert function is called            exit          gt

User · Answer

To show  message in your input    lt  php     if isset   POST  insert               message   The insert function is called              if isset   POST  select               message  The select function is called            gt     lt form  method  post  gt       lt input type  text  name  txt  value   lt  php if isset  message    echo  message    gt    gt       lt input type  submit  name  insert  value  insert  gt       lt input type  submit  name  select  value  select   gt   lt  form gt    To use functioncalling php as an external file you have to include it somehow in your HTML document

User · Answer

Try this   if   POST  select   and   SERVER  REQUEST METHOD       POST        select      if   POST  insert   and   SERVER  REQUEST METHOD       POST        insert

User · Answer

You can write like this in JavaScript or jQuery Ajax and call the file   x000D   x000D      btn   click function    x000D      ajax   x000D      url  test php call true   x000D      type  GET   x000D      success function data   x000D      body append data   x000D        x000D        x000D     x000D   lt script src  https   ajax googleapis com ajax libs jquery 2 0 1 jquery min js  gt  lt  script gt  x000D   lt form  method  get   gt  x000D   x000D     lt input type  button  id  btn  value  click  gt  x000D   lt  form gt  x000D   x000D   lt  php x000D      if isset   GET  call      x000D   x000D          function anyfunction    x000D              echo  added   x000D   x000D                 Your funtion code x000D            x000D        x000D    gt  x000D   x000D   x000D

User · Answer

You cannot call PHP functions like clicking on a button from HTML  Because HTML is on the client side while PHP runs server side   Either you need to use some Ajax or do it like as in the code snippet below    lt  php     if    GET            if  isset   GET  insert                   insert              elseif  isset   GET  select                   select                         function select                echo  The select function is called               function insert                echo  The insert function is called            gt    You have to post your form data and then check for appropriate button that is clicked

[php] How to call a PHP function on the click of a button

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