Question

Well then, this is likely to be the n-th time someone is asking this, but honestly I didn’t grab anything useful spending the last hour or so on Google. What I want to do is rather trivia, or so I thought. I have this working in Java Script but want to move it to PHP. In brief:

• declare a var with a static value
• add text field into which user is asked to enter value of above var
• check if field is a) empty, b) non-empty mismatch, or c) non-empty match

My (limited) PHP wisdom has lead me into believing it ought to be something like the below, but apparently it’s not. I’d very much appreciate any insight, tha.

<?php
$coconew = "blah";

if (isset ($_POST["cocosub"])) {
    if ($_POST["cocoval"] == "") {
        echo "empty";
    } else {
        if ($_POST["cocoval"] != $coconew) {
            echo "mismatch";
        } else {
            echo "match";
        }
    }
}
?>

<form action="<?php $_SERVER['PHP_SELF'] ?>" id="cocosub" method="post">
    <div>
        <?php echo $coconew; ?>
        <input type="text" id="cocoval">
        <input type="submit">
    </div>
</form>

Answer 1

This works:

<?php
session_start();

if(isset($_POST["cocosub"])){

    $input = trim($_POST["cocoval"]);

    if($input == ""){
        echo "empty";
    } elseif($input != $_SESSION["coconew"]){
        echo "mismatch";
    } else {
        echo "match";
    }
}

$_SESSION["coconew"] = substr(md5(uniqid()), 0, 5);

?>

<form action="<?php echo $_SERVER['PHP_SELF']; ?>" id="cocosub" method="post">
<div>
    <?php echo $_SESSION["coconew"]; ?>
    <input type="text" id="cocoval" name="cocoval">
    <input type="submit" name="cocosub">
</div>
</form>

You needed to add name=”cocosub” to the Submit button element in order for the first if(isset(…)) condition to be true. That’s why the script didn’t work. Also, instead of id, you need to use the name=”cocoval” in the input text field as well in order for it to carry over into $_POST.