EC-CUBE 2.4 系の場合
=== bkup_data.csv - "0000-00-00 00:00:00" + "1901-01-01 00:00:00"
=== bkup_data.csv - \\" + \"
↑↓両者の関係が不明。バージョン依存?
=== bkup_data.csv - \"" + \\""
=== bkup_data.csv - \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"" + "" 実際には下記の正規表現で置換した - \\+"" (注: \\ は文字列「\」に相当) + ""