What is the most efficient way to convert a two-dimensional array from a database into a one-dimensional array for CodeIgniter forms in PHP?

When converting a two-dimensional array from a database into a one-dimensional array for CodeIgniter forms in PHP, the most efficient way is to use PHP's array_column() function. This function allows you to extract a single column from a multi-dimensional array and create a new one-dimensional array with the values.

// Assuming $dbArray is the two-dimensional array from the database
$oneDimArray = array_column($dbArray, 'column_name');