Remap a CSV file, given the headers of the target file

RefReMapper

$data = array_map('str_getcsv', 
	['"header1","header2","header3","header4"',
	 '"data1","data2","data3","data4"',
	 '"dataA","dataB","dataC","dataD"'] );

//just get the first line of the csv1's values
$csv1 = array_shift($data);

//csv2
$data2 = array_map('str_getcsv', ['"header4","header3","header2","header1"']);

//get csv2's header values
$csv2 = array_shift($data2);

$target = [];
$acc = 0;
# set up a translation table, mapping $csv2 headers to $csv1 headers
foreach ($csv2 as $h) {
	# check whether the header is in the old file headers
	if (in_array($h, $csv1)) {
		# if it is, find the position.
		# add a reference in $target to the appropriate value in $csv1
		$target[] =& $csv1[ array_search($h, $csv1) ];
	}
	else {
    # no reference in $csv1
		$target[] = '';
	}
}
# sort by keys
ksort($target);

# print out the headers
echo '"' . implode('","', $target) . '"' . PHP_EOL;
$l = count($csv1);
foreach ($data as $row) {
  # put the values of $row into the targeted array
	for($i=0;$i<$l;$i++) {
		$csv1[$i] = $row[$i];
	}	
	echo '"' . implode('","', $target) . '"' . PHP_EOL;
}