How can the PHP script be modified to ensure that a channel is only added if it does not already exist in the database?

To ensure that a channel is only added if it does not already exist in the database, we can modify the PHP script to first check if the channel exists before inserting it. This can be done by querying the database to see if a channel with the same name already exists. If it does, then the channel should not be added. 

// Check if the channel already exists in the database
$existing_channel = $pdo->prepare("SELECT * FROM channels WHERE name = :name");
$existing_channel->execute(array(':name' => $channel_name));

if($existing_channel->rowCount() == 0) {
    // Channel does not exist, proceed with adding it to the database
    $add_channel = $pdo->prepare("INSERT INTO channels (name) VALUES (:name)");
    $add_channel->execute(array(':name' => $channel_name));
    echo "Channel added successfully!";
} else {
    echo "Channel already exists in the database.";
}

Keywords

PHP script modification database channel existence check

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