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21:30:03 Enable Cell Caching using MemoryGZip method
21:30:03 Create new PHPExcel object

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21:30:03 Set properties
21:30:03 Add data

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21:30:03 Hide 'Phone' and 'fax' columns
21:30:03 Set outline levels
21:30:03 Freeze panes
21:30:03 Rows to repeat at top

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21:30:05 Write to Excel2007 format

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21:30:06 File written to 06largescale-with-cellcaching.xlsx
Call time to write Workbook was 1.6335 seconds
21:30:06 Current memory usage: 14 MB
21:30:06 Peak memory usage: 18 MB
21:30:06 Done writing file
File has been created in /var/www/html/letotnghiep.vanlanguni.edu.vn/public_html/vendor/phpoffice/phpexcel/Examples