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Deprecated: strtoupper(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/repo/library-management-system/barcode/code39.barcode.php on line 82

Fatal error: Uncaught Error: Call to undefined function imagecreate() in /var/www/html/repo/library-management-system/barcode/FDrawing.php:36 Stack trace: #0 /var/www/html/repo/library-management-system/barcode.php(22): FDrawing->init() #1 {main} thrown in /var/www/html/repo/library-management-system/barcode/FDrawing.php on line 36

Fatal error: Uncaught Error: Call to undefined function imagedestroy() in /var/www/html/repo/library-management-system/barcode/FDrawing.php:89 Stack trace: #0 /var/www/html/repo/library-management-system/barcode/FDrawing.php(29): FDrawing->destroy() #1 [internal function]: FDrawing->__destruct() #2 {main} thrown in /var/www/html/repo/library-management-system/barcode/FDrawing.php on line 89