Phpexcel Allowed Memory Size of 134217728 Bytes Exhausted

phpexcel Allowed memory size of 134217728 bytes exhausted

There's a lot been written about PHPExcel and memory use, and I'm not going to repeat it all here.

Try reading some of the threads on the PHPExcel discussion board discussing the issue, such as this one; or previous answers here on SO such as this one or this one

PHPExcel Allowed memory size of exhausted

If you cant increase memory limit try another libs

PHP-Export-Data by Eli Dickinson

simple excel

PHP_XLSXWriter

Allowed memory size of 134217728 bytes exhausted in PhpExcel

As another point to note, you're building the PHPExcel object by looping through an array called $data.... a 2d array, that I'm guessing is built from looping through the results of a database query.

That $data array is also going to be using a large part of your memory, more and more memory each day as the number of results grows.

It would be more efficient if, instead of looping through the database resultset to build a large array and then looping through that array to build the PHPExcel data, you looped through the database resultset and built the PHPExcel data directly. That eliminates the memory overhead of $data, and reduces 2 loops to 1.

How to fix memory getting exhausted with PHPExcel?

File size isn't a good measure for workbook files when working with PHPExcel. The number of rows and columns (ie cells) is more important.

The PHPExcel code itself has a footprint of between 10 and 25MB, depending on which components are being accessed.

At present, each cell in a workbook takes on average 1k of memory (without any caching) or 1.6k on 64-bit PHP - I'll assume 32-bit PHP for the moment - so (for example) a worksheet of 8000 lines with 31 columns (248,000 cells) will be about 242MB. With cell cacheing (such as php://temp or DiskISAM), that can be reduced to about a third, so the 8000 lines by 31 columns will require about 80MB.

There are a number of options available to help you reduce the memory usage:

Are you using cell caching with PHPExcel?

require_once './Classes/PHPExcel.php';

$cacheMethod = PHPExcel_CachedObjectStorageFactory:: cache_to_phpTemp;
$cacheSettings = array( ' memoryCacheSize ' => '8MB');
PHPExcel_Settings::setCacheStorageMethod($cacheMethod, $cacheSettings);

$objReader = PHPExcel_IOFactory::createReader('Excel2007');
$objPHPExcel = $objReader->load("test.xlsx");

If you only need to access data in your worksheets, and don't need access to the cell formatting, then you can disable reading the formatting information from the workbook:

$objReader = PHPExcel_IOFactory::createReader('Excel2007');
$objReader->setReadDataOnly(true);
$objPHPExcel = $objReader->load("test.xlsx");

If you only need to access some, but not all of the worksheets in the workbook, you can load only those worksheets:

$objReader = PHPExcel_IOFactory::createReader('Excel2007');
$objReader->setLoadSheetsOnly( array("Worksheet1", "Worksheet2") );
$objPHPExcel = $objReader->load("test.xlsx");

if you only want to read certain cells within worksheets, you can add a filter:

class MyReadFilter implements PHPExcel_Reader_IReadFilter
{
    public function readCell($column, $row, $worksheetName = '') {
        // Read title row and rows 20 - 30
        if ($row == 1 || ($row >= 20 && $row <= 30)) {
            return true;
        }

        return false;
    }
}

$objReader = PHPExcel_IOFactory::createReader('Excel2007');
$objReader->setReadFilter( new MyReadFilter() );
$objPHPExcel = $objReader->load("test.xlsx");

All of these techniques can significantly reduce the memory requirements.

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