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wpdb::get_col_charset() WP 4.2.0

Retrieves the character set for the given column.

This is a method of the class: wpdb

Hooks from the method
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.

Usage

$wpdb = new wpdb();
$var = $wpdb->get_col_charset( $table, $column );
$table(string) (required)
Table name.
$column(string) (required)
Column name.

Changelog

Since 4.2.0 Introduced.

Code of wpdb::get col charset: wp-includes/wp-db.php WP 5.4.2

<?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 4.2.0
	 *
	 * @param string|null $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;
}