How can unique criteria be established to prevent duplicate entries when inserting loop data into a database in PHP?

To prevent duplicate entries when inserting loop data into a database in PHP, unique criteria can be established by creating a unique index or constraint on the database table for the column(s) that should not contain duplicate values. This will ensure that duplicate entries are not inserted and will throw an error if a duplicate entry is attempted. 

// Assuming $dataArray is an array of data to be inserted into the database
foreach ($dataArray as $data) {
    // Check if the data already exists in the database
    $existingData = $db->query("SELECT * FROM table WHERE unique_column = '$data[unique_column]'")->fetch();

    // If data does not exist, insert it into the database
    if (!$existingData) {
        $db->query("INSERT INTO table (unique_column, other_column) VALUES ('$data[unique_column]', '$data[other_column]')");
    }
}

Keywords

PHP database unique criteria duplicate entries loop data

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