UndoLog.php

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<?php
 
namespace MediaWiki\Maintenance;
 
use Wikimedia\Rdbms\IDatabase;
 
class UndoLog {
    private $file;
    private $dbw;
 
    public function __construct( $fileName, IDatabase $dbw ) {
        if ( $fileName !== null ) {
            $this->file = fopen( $fileName, 'a' );
            if ( !$this->file ) {
                throw new \RuntimeException( 'Unable to open undo log' );
            }
        }
        $this->dbw = $dbw;
    }
 
    public function update( $table, array $newValues, array $oldValues, $fname ) {
        $this->dbw->update(
            $table,
            $newValues,
            $oldValues,
            $fname
        );
        $updated = (bool)$this->dbw->affectedRows();
        if ( $this->file && $updated ) {
            $table = $this->dbw->tableName( $table );
            fwrite(
                $this->file,
                "UPDATE $table" .
                    ' SET ' . $this->dbw->makeList( $oldValues, IDatabase::LIST_SET ) .
                    ' WHERE ' . $this->dbw->makeList( $newValues, IDatabase::LIST_AND ) . ";\n"
            );
        }
        return $updated;
    }
}