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Insert data into database by PDO


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Hi everyone, I'm trying to use PDO to insert data in database, seem none of them success, it just breakdown after I click button to submit.

what did I do wrong?

[php]

<?php

/* check to see connection is working */
if(isset($_POST['submit'])) {

    $server = "localhost";
    $username = "Sigma";
    $password = "";
    $dbname = "Register";

try {
    $connect = new PDO ("mysql:host=$server;dbname=$dbname", $username, $password);
} catch (PDOException $error){
    echo $error->getMessage();
}

/* Insert data into database */
    $firsts = $_POST['first'];
    $lasts = $_POST['last'];
    $town = $_POST['town'];
    $states = $_POST['state'];
    $zip = $_POST['zip'];

    $insert = "INSERT INTO `Members`(`firstName`, `lastName`, `town`, `states`, `zip`) VALUES (:firsts,:lasts,:town,:states,:zip)";
    $result = $connect->prepare($insert);
    $result_run = $result->execute(array(":first"=>$firsts, ":last"=>$lasts, ":town"=>$town, ":state"=>$states, ":zip"=>$zip));

if($result_run) {
    echo '<script>alert("successfully added")"</script>';
} else {
    echo '<script>alert("failed added")"</script>';
}


}


?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Gary's PDO website</title>
    <link rel="stylesheet"  type="text/css" href="CSS/insert.css">
</head>
<body>
<p>
    <h2>Welcome to Gary Taylor's Demonstration</h2>
<p>
    <h3>Insert Data in Database by PDO</h3>
<form action="index.php" method="post">
    <table>
        <tr><th colspan="2">Register here</th></tr>
        <tr><td>First Name:</td><td><label><input type="text" name="first" placeholder="Ex: Gary">
        </label></td></tr>
        <tr><td>Last Name:</td><td><label><input type="text" name="last" placeholder="Ex: Taylor">
        </label></td></tr>
        <tr><td>Town:</td><td><label><input type="text" name="town" placeholder="Ex: Richmond">
        </label></td></tr>
        <tr><td>State:</td><td><label><input type="text" name="state" placeholder="Ex: VA">
        </label></td></tr>
        <tr><td>Zip Code:</td><td><label><input type="text" name="zip" placeholder="Ex: 23238">
        </label></td></tr>
        <tr><td colspan="2"><label><input type="submit" name="submit" value="Insert into database"></label></td></tr>
    </table>
</form>
</body>
</html>

[/php]

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