What are the potential risks of not checking for case sensitivity when querying a database for existing values in PHP?

If case sensitivity is not considered when querying a database for existing values in PHP, it can lead to potential issues such as duplicate entries being created due to variations in letter casing. To solve this problem, you can use the `COLLATE` clause in your SQL query to specify a case-insensitive collation for the comparison. 

// Example of querying a database for existing values with case-insensitivity
$value = 'exampleValue';
$query = "SELECT * FROM table_name WHERE column_name COLLATE utf8_general_ci = '$value'";
$result = mysqli_query($connection, $query);

// Check if the value already exists in the database
if(mysqli_num_rows($result) > 0) {
    echo "Value already exists in the database.";
} else {
    echo "Value does not exist in the database.";
}

Keywords

case sensitivity querying database existing values PHP

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