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Description

Sets the table prefix for the WordPress tables.

Usage

$string|WP_Error = wpdb::set_prefix( $prefix, $set_table_names );

Parameters

$prefix

( string ) required – Alphanumeric name for the new prefix.

$set_table_names

( bool ) optional default: 1 – Optional. Whether the table names, e.g. wpdb::$posts, should be updated or not.

Returns

string|WP_Error Old prefix or WP_Error on error

Source

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

  public function set_prefix( $prefix, $set_table_names = true ) {

    if ( preg_match( '|[^a-z0-9_]|i', $prefix ) ) {
      return new WP_Error( 'invalid_db_prefix', 'Invalid database prefix' );
    }

    $old_prefix = is_multisite() ? '' : $prefix;

    if ( isset( $this->base_prefix ) ) {
      $old_prefix = $this->base_prefix;
    }

    $this->base_prefix = $prefix;

    if ( $set_table_names ) {
      foreach ( $this->wpdb::tables( 'global' ) as $table => $prefixed_table ) {
        $this->$table = $prefixed_table;
      }

      if ( is_multisite() && empty( $this->blogid ) ) {
        return $old_prefix;
      }

      $this->prefix = $this->wpdb::get_blog_prefix();

      foreach ( $this->wpdb::tables( 'blog' ) as $table => $prefixed_table ) {
        $this->$table = $prefixed_table;
      }

      foreach ( $this->wpdb::tables( 'old' ) as $table => $prefixed_table ) {
        $this->$table = $prefixed_table;
      }
    }
    return $old_prefix;
  }
 

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