Trigger PHP function by clicking HTML link

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Is it possible to trigger a PHP function by just clicking a link? Or should I stick with the form submit method? If clicking the link will work, where should the link refer

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臣服心动

2020-12-21 03:20
You can pass it as a query parameter of the link. http://example.com/?command=listMe&username=tom However that way everybody will be able to run the function by loading that URL
```
<a href="http://example.com/?command=listMe&">List me</a>
```
and in the PHP
```
<?php
if( isset($_GET['list_me']) && isset($_SESSION['Username'] ) ){
   listMe( $_SESSION['Username'] );
}
?>
```
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自闭症患者

2020-12-21 03:26

You can do this by means of loading the entire page over again by the use of form submission, or by loading specific page contents directly into the page without needing to go from page to page. The second method is called "AJAX" (Asynchoronous Javascript and XML). Here are two examples, one of each specified.

Form submission approach

form.php

<?php
function get_users(){
}
if(isset($_GET['get_users']))
{
    get_users();
}
?>
...
<form method="get">
    <input type="hidden" name="get_users">
    <input type="submit">
</form>

AJAX approach

ajax_file.php

<?php
function call_me(){
    // your php code
}
call_me();
?>

form.html

<html>
<head>
<script type="text/javascript">
function loadXMLDoc()
{
    var xmlhttp;
    if (window.XMLHttpRequest)
    {
        xmlhttp = new XMLHttpRequest();
    }
    else
    {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    xmlhttp.onreadystatechange = function()
    {
        if(xmlhttp.readyState == 4 && xmlhttp.status == 200)
        {
            // do something if the page loaded successfully
        }
    }
    xmlhttp.open("GET","ajax_file.php",true);
    xmlhttp.send();
}
</script>
</head>
<body>
<a href="#" onclick="loadXMLDoc()">click to call function</a>
</body>
</html>

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名媛妹妹

2020-12-21 03:32
HTML
```
<a href="?list_me">list me</a>
```
PHP
```
<?php
if (isset($_GET['list_me'])) listMe();
```
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心在旅途

2020-12-21 03:35
To trigger a function on link click with php the only way I know would be to append a param in the url of the link and then listen for that
```
<a href="?function">Add my username to the list</a>
```
Then check for link
```
if (isset($_GET['function'])){
      runFunction();
}
```
This is because php is a server side technology if you want to fire something without refreshing the page you would need to look at something like javascript
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臣服心动

2020-12-21 03:44

I found this code in a plugin, they have user a foreach look to trigger the action:

$actions = unset($meta[$key]);
foreach ( $actions as $action => $value ) {
    echo '<li><a href="' . esc_url( $value['url'] ) . '" class="my-action-' . $action . '">' . '<i class="fa fa-times"></i></a></li>';
}

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