Take an array of bytes, and output a series of signed integers (16bit)

BytesToSigned.php

<?php

$data = array( 

  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00

);

$final = array();

function zeropad($num, $lim) {
   return (strlen($num) >= $lim) ? $num : zeropad("0" . $num, $lim);
}

do {
	$piece = zeropad((string) dechex(array_shift( $data )),2);
	$piece = zeropad(((string) dechex(array_shift($data))),2). $piece;

	$final[] = $piece;
} while( count( $data ));

$results = array();

foreach( $final as $piece ) {
	$results[] = unpack("s", pack("s", hexdec( $piece )));
}

$count = 0;
foreach( $results as $result ) {
	echo $result[1] . ", ";
	++$count;
	if($count==10) {
		echo "\n";
		$count = 0;
	}
}