This code will help you.

?php
// Put all the php.ini parameters you want to change below. One per line.
// Follow the example format $parm[] = "parameter = value";
$parm[] = "post_max_size = 10M";
$parm[] = "register_globals = Off";
$parm[] = "session.use_trans_sid = 0";
// full unix path - location of the default php.ini file at your host
// you can determine the location of the default file using phpinfo()
$defaultPath = '/usr/local/Zend/etc/php.ini';
// full unix path - location where you want your custom php.ini file
$customPath = "/home/airlinez/public_html/php.ini";
// nothing should change below this line.
if (file_exists($defaultPath)) {
$contents = file_get_contents($defaultPath);
$contents .= "\n\n; USER MODIFIED PARAMETERS FOLLOW\n\n";
foreach ($parm as $value) $contents .= $value . " \n";
$handle = fopen($customPath, 'w');
if (fwrite($handle, $contents)) {
fclose($handle);
if (chmod($customPath,0600)) $message = "The php.ini file has been modified and copied";
else $message = "Processing error - php.ini chmod failed";
} else {
$message = "Processing error - php.ini write failed";
}
} else {
$message = "Processing error - php.ini file not found";
}
echo $message;
?>


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Thanks