Description:
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I tried using the ZipFile class I found somewhere else to compress files and produce a zip file.  But when my input file is larger than 6 megabytes in size, I don't get a zip/compressed file.  I debugged the ZipFile class and found out that gzcompress() function doesn't work with a large file e.g. 6 MB file.

So, in order to compress my 6 MB file and produce a zip file, I just used the ff. line of code:

system("zip $zipfile_name $file_name > /dev/null", $return_val);

Reproduce code:
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#!/usr/bin/php        #phptest.php
<?php
                                                                                                                             
$file = "ATD335R1.208";  #some file here
                                                                                                                             
$fp = fopen($file, "r");
                                                                                                                             
if($fp) {
        $data = fread($fp, filesize($file));
        fclose($fp);
}
                                                                                                                             
$unc_len = strlen($data);
                                                                                                                             
$crc = crc32($data);
                                                                                                                             
$zdata = gzcompress($data); #HERE'S WHERE AN ERROR OCCURS
                                                                                                                             
print "GZCOMPRESS DONE..".strlen($zdata);
?>


Expected result:
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"GZCOMPRESS DONE.."

Actual result:
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PHP Fatal error:  Allowed memory size of 8388608 bytes exhausted (tried to allocate 6945661 bytes) in /var/www/html/phptest.php on line 17
Content-type: text/html
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