09:02:06 Create new PHPExcel object
09:02:06 Set document properties
09:02:06 Set default font
09:02:06 Add some data
09:02:06 Rename worksheet
09:02:06 Write to Excel5 format
Fatal error: Uncaught Error: Call to undefined function mb_strtolower() in /var/www/html/01/hk1/vendor/phpoffice/phpexcel/Classes/PHPExcel/Style/NumberFormat.php:448
Stack trace:
#0 [internal function]: PHPExcel_Style_NumberFormat::setLowercaseCallback(Array)
#1 /var/www/html/01/hk1/vendor/phpoffice/phpexcel/Classes/PHPExcel/Style/NumberFormat.php(464): preg_replace_callback('/(?:^|")([^"]*)...', Array, 'yyyy-mm-dd')
#2 /var/www/html/01/hk1/vendor/phpoffice/phpexcel/Classes/PHPExcel/Style/NumberFormat.php(647): PHPExcel_Style_NumberFormat::formatAsDate(45865.334791667, 'yyyy-mm-dd')
#3 /var/www/html/01/hk1/vendor/phpoffice/phpexcel/Classes/PHPExcel/Worksheet.php(738): PHPExcel_Style_NumberFormat::toFormattedString(45865.334791667, 'yyyy-mm-dd')
#4 /var/www/html/01/hk1/vendor/phpoffice/phpexcel/Classes/PHPExcel/Writer/Excel5/Worksheet.php(288): PHPExcel_Worksheet->calculateColumnWidths()
#5 /var/www/html/01/hk1/vendor/phpoffice/phpexcel/Classes/PHPExcel/Writer/Excel5.php(175): PHPExcel_Writer_Excel5_Worksheet->close()
#6 / in /var/www/html/01/hk1/vendor/phpoffice/phpexcel/Classes/PHPExcel/Style/NumberFormat.php on line 448