function write_ini($array,$file){
	$res=array();
	foreach($array as $key=>$val){
		if(is_array($val)){
			$res[]="[$key]";
			foreach($val as $skey=>$sval){
				$res[]="$skey = ".(is_numeric($sval)?$sval:'"'.$sval.'"');
			}
		}
		else{
			$res[]="$key = ".(is_numeric($val)?$val:'"'.$val.'"');
		}
	}
	safefilerewrite($file,implode("\r\n",$res));
}
function safefilerewrite($fileName,$dataToSave){
	if($fp=fopen($fileName,'w')){
		$startTime=microtime(TRUE);
		do{
			$canWrite=flock($fp,LOCK_EX);
			if(!$canWrite){
				usleep(round(rand(0,100)*1000));
			}
		}
		while((!$canWrite)and((microtime(TRUE)-$startTime)<5));
		if($canWrite){
			fwrite($fp,$dataToSave);
			flock($fp,LOCK_UN);
		}
		fclose($fp);
	}
}
$ini=parse_ini_file($_SERVER['DOCUMENT_ROOT']."/file.ini");
$ini['key']='value';
write_ini($ini,$_SERVER['DOCUMENT_ROOT']."/file.ini");