Microtonal keyboard generator

<?php
$fundamentalTone = readline("Fundamental tone (in Hz) : ");
$octaves = readline("Number of octaves : ");
$tonesPerOctave = readline("Tones per octave : ");
function tone_generator($freqOfTone = 440, $i) {
$sampleRate = 44100;
$samplesCount = 80000;

$amplitude = 0.25 * 32768;
$w = 2 * pi() * $freqOfTone / $sampleRate;

$samples = array();
for ($n = 0; $n < $samplesCount; $n++) {
    $samples[] = (int)($amplitude *  sin($n * $w));
}

$srate = 44100; //sample rate
$bps = 16; //bits per sample
$Bps = $bps/8; //bytes per sample

$str = call_user_func_array("pack",
    array_merge(array("VVVVVvvVVvvVVv*"),
        array(//header
            0x46464952, //RIFF
            1600038, //File size
            0x45564157, //WAVE
            0x20746d66, //"fmt " (chunk)
            16, //chunk size
            1, //compression
            1, //nchannels
            $srate, //sample rate
            $Bps*$srate, //bytes/second
            $Bps, //block align
            $bps, //bits/sample
            0x61746164, //"data"
            160000 //chunk size
        ),
        $samples //data
    )
);
$myfile = fopen("sine$i.wav", "wb") or die("Unable to open file!");
fwrite($myfile, $str);
fclose($myfile);
}
$content = "<title>SINE, that's the wrong NUMBAH !</title>
<style>
table {
 height : 100%;
 width  : 100%;
}
td {
 border : solid 1px black;
 width  : " . (100/$tonesPerOctave) . "%;
}
</style>
<table cellspacing='0'>
";
for ($t = 0; $t < $tonesPerOctave*$octaves; $t++) {
 tone_generator($fundamentalTone*pow(2,$t/$tonesPerOctave), $t);
 if ($t % $tonesPerOctave == 0) {
  $content .= "\n<tr>";
 }
 $content .= "<script>var sine$t = new Audio('sine$t.wav')</script>\n<td onclick='sine$t.play()'>&approx; " . round($fundamentalTone*pow(2,$t/$tonesPerOctave), 2) . " Hz";
}
file_put_contents("sine.html", $content);
?>