call a php function with onclick-CodePudding

how do you call a php function with html I have this:

<input   type="button" name="woonkameruit" value="UIT" onclick="kameroff('woonkamer');<?php woonkameruit()?>">

and

function woonkameruit() {
   exec("sudo pkill python");
   exec("sudo python3/home/pi/Documents/Programmas/WOONKAMERUit.py");
}

can you help?

CodePudding user response：

You cannot directly call PHP functions with HTML as it is in the backend.

However you can send a request to the backend with JS or HTML and make the PHP handle it so it executes a function.

To do this there are multiple ways:

HTML: Form

JS: Ajax

If you do not know how to implement this I suggest going to websites such as w3schools or just looking in youtube.

CodePudding user response：

You have to send the function name via Javascript, and create some controller like logic. It is a similar to what Laravel Livewire does. For Example:

frontend.php:

<!-- Frontend Logic -->
<input id="myButton"   type="button" name="woonkameruit" value="UIT">


<!-- Put Before </body> -->
<script type="text/javascript">

function callBackend(f) {
    fetch(`https://myapp.com/backend.php?f=${f}`)
        .then(response => response.json())
        .then(data => {
            // Do what you have to do with response
            console.log(data)

            if(data.success) {
                // Function Run Successfully
            } else {
                // Function Error
            }
        
        })
        // Other Errors
        .catch(err => console.error(err));
}

const myButton = document.getElementById('myButton')

myButton.onclick = (e) => {
   e.preventDefault()

   callBackend('woonkameruit')
}

</script>

backend.php:

<?php
// Backend logic

function send_json_to_client($status, $data) {
    $cors = "https://myapp.com";
    header("Access-Control-Allow-Origin: $cors");
    header('Content-Type: application/json; charset=utf-8');
    http_response_code($status);
    echo json_encode($data);
    
    exit(1);
}

function woonkameruit() {
    $first_command  = exec("sudo pkill python");
    $second_command = exec("sudo python3/home/pi/Documents/Programmas/WOONKAMERUit.py");

    $success = false;
    $message = 'Something Went Wrong';
    $status = 500;

    // If everything went good. Put here your success logic
    if($first_command !== false && $second_command !== false) {
        $success = true;
        $message = 'Everything Is Good';
        $status = 200;
    }

    return [
        'status' => $status,
    
        'response' => [
            'success' => $success,
            'message' => $message,
        ],
    ];
 }

$authorizedFunctions = [
    'woonkameruit'
];

if(isset($_GET['f'])) {

    $fn = filter_input(INPUT_GET, 'f', FILTER_SANITIZE_STRING);

    if( in_array( $fn, $authorizedFunctions ) ) {

        $response = $fn();

        send_json_to_client($response['status'], $response['response']);

    } else {
        send_json_to_client(403, [
            'success' => false,
            'message' => 'Unauthorized'
        ]);
    }

} else {
    send_json_to_client(404, [
        'success' => false,
        'message' => 'Not Found'
    ]);
}