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Description

Retrieves the character set for the given column.

Usage

$string|false|WP_Error = wpdb::get_col_charset( $table, $column );

Parameters

$table

( string ) required – Table name.

$column

( string ) required – Column name.

Returns

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

  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->wpdb::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;
  }
 

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