How do you check if a button has been pressed in html/php-CodePudding

I'm trying to build a blog page via HTML and PHP. I have a file called edit.php with two buttons on it, Update and Delete. I want to know how PHP can check to see WHICH button was pressed (Update or delete) so it knows which function to call to either update or delete the post?

i have my html as:

<input type="submit" name="command" value="Update" />
<input type="submit" name="command" value="Delete" onclick="return confirm('Are you sure you wish to delete this post?')" />

and in my php file that processes the posts Create, Delete or Update functions, i have tried using like:

if ($_POST && ($_POST['submit'] == "Delete"))
{
  delete();
}

but I keep getting errors back saying: Warning: Undefined array key "submit"

If anyone can give me some direction on how one PHP file can see a button value from another PHP file, I would appreciate that!

CodePudding user response：

Use isset to check if var exists and has any value other than null. You are checking by input type, instead, Check by input field name.

<input type="submit" name="update" value="Update" />
<input type="submit" name="delete" value="Delete" onclick="return confirm('Are you sure you wish to delete this post?')" />

<?php
    if (isset($_POST['update'])) {
        update();
    }
    elseif (isset($_POST['delete'])) {
        delete();
    }
?>