<?php
include 'phprandom.php';
$img = imageCreateTrueColor(256, 256);
$colors = array();
for ($i = 0; $i < 256; $i++) {
$colors[$i] = imageColorAllocate($img, $i, $i, $i);
}
for ($i = 0; $i < 256; $i++) {
$random = PHPRandom::getBinary(256);
for ($j = 0; $j < 256; $j++) {
$value = ord(substr($random, $j, 1));
imageSetPixel($img, $i, $j, $colors[$value]);
}
}
header('Content-Type: image/png');
imagePNG($img);
imageDestroy($img);
public function test_binary()
{
$count = 2000;
$tolerance = 0.9;
$buckets = array_fill(0, 256, 0);
for ($i = 1; $i <= $count; $i++) {
$len = mt_rand(2, 256);
$str = PHPRandom::getBinary($len);
$this->assertEquals($len, strlen($str));
$buckets[ord($str[0])]++;
}
$distribution = 0;
foreach ($buckets as $key => $value) {
if ($value > $count / 256 * 0.5) {
$distribution++;
}
if ($value < $count / 256 * 1.5) {
$distribution++;
}
}
$this->assertGreaterThan(256, $distribution);
}
