wpdb::get_col_charset( string $table, string $column )
Retrieves the character set for the given column.
Parameters
- $table
-
(Required) Table name.
- $column
-
(Required) Column name.
Return
(string|false|WP_Error) Column character set as a string. False if the column has no character set. WP_Error object if there was an error.
Source
File: wp-includes/wp-db.php
public function get_col_charset( $table, $column ) {
$tablekey = strtolower( $table );
$columnkey = strtolower( $column );
/**
* Filters the column charset value before the DB is checked.
*
* Passing a non-null value to the filter will short-circuit
* checking the DB for the charset, returning that value instead.
*
* @since WP-4.2.0
*
* @param string $charset The character set to use. Default null.
* @param string $table The name of the table being checked.
* @param string $column The name of the column being checked.
*/
$charset = apply_filters( 'pre_get_col_charset', null, $table, $column );
if ( null !== $charset ) {
return $charset;
}
// Skip this entirely if this isn't a MySQL database.
if ( empty( $this->is_mysql ) ) {
return false;
}
if ( empty( $this->table_charset[ $tablekey ] ) ) {
// This primes column information for us.
$table_charset = $this->get_table_charset( $table );
if ( is_wp_error( $table_charset ) ) {
return $table_charset;
}
}
// If still no column information, return the table charset.
if ( empty( $this->col_meta[ $tablekey ] ) ) {
return $this->table_charset[ $tablekey ];
}
// If this column doesn't exist, return the table charset.
if ( empty( $this->col_meta[ $tablekey ][ $columnkey ] ) ) {
return $this->table_charset[ $tablekey ];
}
// Return false when it's not a string column.
if ( empty( $this->col_meta[ $tablekey ][ $columnkey ]->Collation ) ) {
return false;
}
list( $charset ) = explode( '_', $this->col_meta[ $tablekey ][ $columnkey ]->Collation );
return $charset;
}
Changelog
Version | Description |
---|---|
WP-4.2.0 | Introduced. |