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Description

Retrieve one column from the database.

Executes a SQL query and returns the column from the SQL result. If the SQL result contains more than one column, this function returns the column specified. If $query is null, this function returns the specified column from the previous SQL result.

Usage

$array = wpdb::get_col( $query, $x );

Parameters

$query

( string|null ) optional – Optional. SQL query. Defaults to previous query.

$x

( int ) optional – Optional. Column to return. Indexed from 0.

Returns

array Database query result. Array indexed from 0 by SQL result row number.

Source

File name: wordpress/wp-includes/wp-db.php

  public function get_col( $query = null, $x = 0 ) {
    if ( $this->check_current_query && $this->wpdb::check_safe_collation( $query ) ) {
      $this->check_current_query = false;
    }

    if ( $query ) {
      $this->wpdb::query( $query );
    }

    $new_array = array();
    // Extract the column values.
    if ( $this->last_result ) {
      for ( $i = 0, $j = count( $this->last_result ); $i < $j; $i++ ) {
        $new_array[ $i ] = $this->wpdb::get_var( null, $x, $i );
      }
    }
    return $new_array;
  }
 

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