wp-includes/class-wpdb.php:3895Retrieves column metadata from the last query.
$info_typestringoptional'name'$col_offsetintoptional-1mixed public function get_col_info( $info_type = 'name', $col_offset = -1 ) { $this->load_col_info(); if ( $this->col_info ) { if ( -1 === $col_offset ) { $i = 0; $new_array = array(); foreach ( (array) $this->col_info as $col ) { $new_array[ $i ] = $col->{$info_type}; ++$i; } return $new_array; } else { return $this->col_info[ $col_offset ]->{$info_type}; } } }Introduced in 0.71. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wpdb.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.