how to implement onclick for php button - php

Question

I have a line in a php code that reads something like this:
echo '<div class="sample-button">Do something</div>'
This shows a clickable text link on the page. Now I want that clicking on this link should call a php function myFunc() which I have defined in the same php file. How do I implement this?

Answer 1

Whatever the <a href="#"> gos to is your answer.
The path needs to be <a href="#?call=1">
Now that's set, you need to create an if statment..
if ($_GET['call'] === 1){ myFunc(); }
When you click the link, it should refresh the page with the url now set to: localhost/page.php?call=1. As the php page is refreshed it can call MyFunc().

Answer 2

You can call a JS function on click, not a php one. I think you have to better check the documentation on what is the purpose of the php language.

Answer 3

If you really want to execute a php script by clicking on the link you can use jquery ajax.
In your case call the same php file where the function is located by listening to the button's click event and perform the ajax request:
$('.sample-button').click(function() {
// Ajax Call
$.ajax({
url: "/path_to_your_script.php",
contentType: "application/x-www-form-urlencoded",
type: "POST",
data: {callFunction:true},
success: function(response){
// Check your response
},
error: function(){
// Error handling
}
});
});
On top of your php script you need to check:
<?php
if (!empty($_POST['callFunction'])) {
your_function() {
return $yourResponse;
}
exit();
}

Answer 4

A quick example ( untested ) to show how you might invoke your php function and use the response after clicking a standard link on a page.
<?php
if( $_SERVER['REQUEST_METHOD']=='POST' && isset( $_POST['action'] ) && $_POST['action']=='call_my_func' ){
/* ensure we discard the buffer if we need to send a response */
ob_clean();
function myFunc($var){
echo 'PHP function...';
}
/* call your function */
call_user_func( 'myFunc', 'some variable' );
exit();
}
?>
<script type='text/javascript'>
function invoke_myfunc(){
var http=new XMLHttpRequest();
http.onreadystatechange=function(){
if( http.readyState==4 && http.status==200 ) alert( http.response );
};
var headers={
'Content-type': 'application/x-www-form-urlencoded'
};
http.open('POST', document.location.href, true );
for( header in headers ) http.setRequestHeader( header, headers[ header ] );
http.send( [ 'action=call_my_func' ].join('&') );
}
</script>
<?php
/*
in your page
-------------
*/
echo '<div class="sample-button">Do something</div>';
?>