napriklad takto:
Ulozis si cely CSV do 2D pola. Zmenis nejaku hodnotu na 666. Otvoris znovu subor ale tentokrat na zapis. S tym, ze pri otvoreni sa cely obsah zmaze a postupne tam nasackujes naspat pole.

<?php
	$list = array();
	$handle = fopen('model.csv', 'r');
	
	while ($csv = fgetcsv($handle, 0, ';')) {
		array_push($list, $csv);
	}
	fclose($handle);
	
	$list[0][2] = '666';
	
	$handlew = fopen('model.csv', 'w');

	foreach ($list as $fields) {
		fputcsv($handlew, $fields, ';');
	    echo "zapis riadku<br>";
	}
	
	fclose($handlew);
?>