passing php variable as function argument

Question

I have home.php and I am trying to pass two php variables in an onclick() function. But it does not work. I am new in php so any suggestion will be very helpful.

<form action="process/home.php" method="post">
        <input type="text" name="userfrom" value="<?php echo htmlspecialchars($username); ?>"/>
        <input type="submit" onclick=show('$user_id','$_SESSION['id']') value="Add Friend"/>
    </form>

In the show() function I wanted to store the values in the database.

function show($userfrom,$userto){

    $sql="INSERT INTO user (userfrom,userto) VALUES ('$userfrom','$userto')";
    mysql_query($sql);
    <!--it is not working-->
}

Osman Omar · Accepted Answer · 2018-11-02 04:35:43Z

1

Your are new in php. So, remember this, you can't use PHP functions in JS code. onClick event needs js function. So firstly, you should pass your variables, with form then get it and after that you can use php functions.

You can use this code, but not recommended

<form action="" method="post">
    <input type="text" name="userfrom" value="<?= htmlspecialchars($username); ?>"/>
    <input type="submit" name="addFriend" />
</form>

<?php
    if (isset($_POST['addFriend'])) {
        show($user_id, $_SESSION['id']);
    }
?>

You should learn about jquery ajax. (Advice for you)

answered Nov 2, 2018 at 4:35

Osman Omar

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Comments

Madhusudan · Accepted Answer · 2018-11-02 03:41:34Z

0

Try below code, You have some syntax errors,

<form action="process/home.php" method="post">
        <input type="text" name="userfrom" value="<?php echo htmlspecialchars($username); ?>"/>
        <input type="submit" onclick="show(<?php echo $userid ; ?>, <?php echo 
 $_SESSION['id']; ?>)" value="Add Friend"/>
    </form>

answered Nov 2, 2018 at 3:41

Madhusudan

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1 Comment

Madhusudan Over a year ago

It will not call php function, this is only called javascript function you need to use Ajax to call php function.

ACD · Accepted Answer · 2018-11-02 03:47:18Z

0

You need to echo your php variables into HTML elements.

onclick=show('<?=$user_id;?>','<?=$_SESSION['id'];?>')

shorthand for echo: <?=

and don't forget to add quotations when passing string values.

answered Nov 2, 2018 at 3:47

ACD

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