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12 years ago
The code below illustrates usage of the second parameter, in particular to protect against fatal out-of-memory errors. It outputs:



1000000

1000000

error



Tested with PHP 5.3 on 32bit Linux.



<?php



function tryToGzinflate($deflatedData, $maxLen = 0) {

  $data = gzinflate($deflatedData, $maxLen);

  if ($data === false)

    echo 'error<br>';

  else

    echo strlen($data).'<br>';

}



// random data:

$data = '';

for ($i = 0; $i < 1000000; $i++)

  $data .= chr(mt_rand(97, 122)); // a-z



$deflatedData = gzdeflate($data);



ini_set('memory_limit', '5M'); // plenty of memory

tryToGzinflate($deflatedData);

tryToGzinflate($deflatedData, strlen($data));



ini_set('memory_limit', '100'); // little memory

tryToGzinflate($deflatedData, 100);

tryToGzinflate($deflatedData); // causes fatal out-of-memory error

?>
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