Fatal error: Uncaught TypeError: extract(): Argument #1 ($array) must be of type array, null given in D:\iweb Dropbox\Mohamed Anwar\islamweb-www\newlibrary\display_book.php:13 Stack trace: #0 D:\iweb Dropbox\Mohamed Anwar\islamweb-www\newlibrary\display_book.php(13): extract() #1 {main} thrown in D:\iweb Dropbox\Mohamed Anwar\islamweb-www\newlibrary\display_book.php on line 13