wpdb::get_col( string|null $query = null, int $x = 0 ): array
- Since
- 0.71
- Source
wp-includes/class-wpdb.php:3139
Retrieves one column from the database.
Description
Executes a SQL query and returns the column from the SQL result.If the SQL result contains more than one column, the column specified is returned.If $query is null, the specified column from the previous SQL result is returned.
Parameters
$querystring|nulloptional- SQL query. Defaults to previous query.Default:
null $xintoptional- Column to return. Indexed from 0. Default 0.Default:
0
Return
array- Database query result. Array indexed from 0 by SQL result row number.
Uses · 3
- wpdb::check_safe_collation()Checks if the query is accessing a collation considered safe.
- wpdb::query()Performs a database query, using current database connection.
- wpdb::get_var()Retrieves one value from the database.
Source
public function get_col( $query = null, $x = 0 ) { if ( $query ) { if ( $this->check_current_query && $this->check_safe_collation( $query ) ) { $this->check_current_query = false; } $this->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[] = $this->get_var( null, $x, $i ); } } return $new_array; }History
Introduced in 0.71. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
About this page
- Parsed data
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src/wp-includes/class-wpdb.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it. - Corrections
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