12:20:03 Create new PHPExcel object<br />12:20:03 Set document properties<br />12:20:03 Set default font<br />12:20:03 Add some data<br />12:20:03 Rename worksheet<br />12:20:03 Write to Excel5 format<br /><br />
<b>Fatal error</b>:  Uncaught Error: Call to undefined function mb_strtolower() in /var/www/desigualdades/html/vendor/phpoffice/phpexcel/Classes/PHPExcel/Style/NumberFormat.php:448
Stack trace:
#0 [internal function]: PHPExcel_Style_NumberFormat::setLowercaseCallback(Array)
#1 /var/www/desigualdades/html/vendor/phpoffice/phpexcel/Classes/PHPExcel/Style/NumberFormat.php(464): preg_replace_callback('/(?:^|&quot;)([^&quot;]*)...', Array, 'yyyy-mm-dd')
#2 /var/www/desigualdades/html/vendor/phpoffice/phpexcel/Classes/PHPExcel/Style/NumberFormat.php(647): PHPExcel_Style_NumberFormat::formatAsDate(46284.472256944, 'yyyy-mm-dd')
#3 /var/www/desigualdades/html/vendor/phpoffice/phpexcel/Classes/PHPExcel/Worksheet.php(738): PHPExcel_Style_NumberFormat::toFormattedString(46284.472256944, 'yyyy-mm-dd')
#4 /var/www/desigualdades/html/vendor/phpoffice/phpexcel/Classes/PHPExcel/Writer/Excel5/Worksheet.php(288): PHPExcel_Worksheet-&gt;calculateColumnWidths()
#5 /var/www/desigualdades/html/vendor/phpoffice/phpexcel/Classes/PHPExcel/Writer/Excel5.php(175): PHPE in <b>/var/www/desigualdades/html/vendor/phpoffice/phpexcel/Classes/PHPExcel/Style/NumberFormat.php</b> on line <b>448</b><br />