function encrypt($data = '', $encryption = '')
{
if (empty($data)) {
return;
}
switch (strtoupper($encryption)) {
case 'MD5':
$text = md5($data);
break;
case 'SHA1':
$text = sha1($data);
break;
case 'CRC32':
$text = crc32($data);
break;
case 'COMPLEX':
//$text = complex($data);
for ($i = 0; $i <= 100; $i++) {
if (checkComplexString($data = complex($data)) === true) {
$text = $data;
break;
}
}
break;
default:
$text = md5($data);
break;
}
return $text;
}
public function testComplexHelperFunction()
{
$this->assertTrue(function_exists('complex'));
$this->assertInstanceOf('Math\\Complex', complex(1, 1));
$complex = complex(1, 2);
$this->assertEquals($complex->getRealPart()->getValue(), 1);
$this->assertEquals($complex->getImagPart()->getValue(), 2);
}
function julia_ppm($filename, $size, $depth, $zreal, $zimag)
{
## open the file
if (file_exists($filename)) {
unlink($filename);
}
$ppm = fopen($filename, "w");
## write ppm header
ppm_write($ppm, "P3\n");
## write width and height
ppm_write($ppm, $size . " " . $size . "\n");
## write max value
ppm_write($ppm, $depth . "\n");
## write pixel values
$z = complex($zreal, $zimag);
$real_min = -1.2;
$real_max = 1.2;
$imag_min = -1.2;
$delta = ($real_max - $real_min) / $size;
for ($i = 0, $xreal = $real_min; $i < $size; $i++, $xreal = $xreal + $delta) {
for ($j = 0, $ximag = $imag_min; $j < $size; $j++, $ximag = $ximag + $delta) {
$count = 0;
$x = complex($xreal, $ximag);
while ($count < $depth && complex_abs($x) < 2.0) {
$count++;
$x = complex_add(complex_multiply($x, $x), $z);
}
if (complex_abs($x) <= 2.0) {
ppm_write($ppm, "0 0 0\n");
} else {
$intensity = $count / $depth;
if ($intensity > 0.001) {
ppm_write($ppm, round($depth - $depth * $intensity) . " " . round($depth - $depth * $intensity) . " " . $depth . "\n");
}
}
}
}
fclose($ppm);
}
