How to get string value from php function?

Question

I want to execute a function in php that returns a string but I couldn't find a clear explanation.

I would really like if you could answer for this example.

this is my php file, hello.php:

<?php
  function HelloWorld()
  {
    return "Hello!";
  }
?>

and let's say this is my javascript in my HTML file

MainPage.html

<body>
  <script type="text/javascript">
    sayHello()
    {
      alert(/*This is where I want My php to call*/);   
    }
  </script>  
  <input type = "submit" onclick="sayHello()"/>
</body>

What I am asking is how can I get my php and use functions in it succesfully

You will need to call the server-side page (hello.php) and execute the function, then do whatever you wish with the response. — NewToJS
– NewToJS, Commented Jun 4, 2015 at 10:12
I am sorry but this doesn't work. I have a couple of jquery codes. And this breaks other codes somehow.. — Çağatay Sarp Aksu
– Çağatay Sarp Aksu, Commented Jun 4, 2015 at 10:14
@Viral that won't work because the MainPage.html isn't a server-side document. hence MainPage - .html — NewToJS
– NewToJS, Commented Jun 4, 2015 at 10:17

Viral · Accepted Answer · 2015-06-04 10:20:51Z

1

Do one thing, change MainPage.html to MainPage.php.

So, you MainPage.php will look like

<?php
  function HelloWorld()
  {
    return "Hello!";
  }
?>
<body>
  <script type="text/javascript">
    sayHello()
    {
      alert('<?php echo HelloWorld()?>');
    }
  </script>  
  <input type = "submit" onclick="sayHello()"/>
</body>

This will work for you.

answered Jun 4, 2015 at 10:20

Viral

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Viral · Accepted Answer · 2015-06-04 10:47:57Z

0

Without changing file extensions:

Make your file speak by echo at the end of file hello.php

<?php
  function HelloWorld()
  {
    return "Hello!";
  }
  echo HelloWorld();
?>

Change MainPage.html to call ajax from hello.php like,

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script>
    $(document).ready(function(){
        $('#clickme').click(function(){
            $.ajax({
                url : 'hello.php',
                type : 'GET',
                dataType:'html',
                success : function(data) {           
                    alert(data);
                }
            });
        });
    });
</script>
<body>
  <input type="button" id="clickme"/>
</body>

Also check that both of your files is in the same directory, i used popular JavaScript framework called jQuery for ajax call.

answered Jun 4, 2015 at 10:47

Viral

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2 Comments

Çağatay Sarp Aksu Over a year ago

can you explain how do I choose which function do I call from php file?

Viral Over a year ago

that you have to decide on your php file, see above, i have called HelloWorld() by placing echo at start, you can call any other function, there are many methodologies, please go through some pages here, you will get more idea.

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