What does the error message "Duplicate entry '127' for key 1" in PHP indicate?

The error message "Duplicate entry '127' for key 1" in PHP indicates that you are trying to insert a record into a database table with a primary key value that already exists. To solve this issue, you need to ensure that the primary key values are unique for each record being inserted. You can either update the existing record with the same primary key value or choose a different primary key value for the new record. 

// Example code to prevent duplicate entry error
$sql = "INSERT INTO table_name (id, column1, column2) VALUES ('127', 'value1', 'value2') ON DUPLICATE KEY UPDATE column1 = 'value1', column2 = 'value2'";
$result = mysqli_query($connection, $sql);

if (!$result) {
    echo "Error: " . $sql . "<br>" . mysqli_error($connection);
}

Keywords

PHP error message Duplicate entry key database

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