Drawing Parabola using PHP GD
Simply while the class was going on , my professor was telling us about parabola formed by y=x^x equation and I was busy with this stupid code at my back page 
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Drawing Parabola Using PHP GD
<?php
set_time_limit(1);
$limit=1000;
$im = imagecreate($limit,$limit);
$bgcolor = imagecolorallocate($im,0,0,0); // white background
$for = imagecolorallocate($im,255,0,0);
$xy= imagecolorallocate($im,0,0,225);$gray = imagecolorallocate($im,0,100,0);for($i=0;$i<=$limit;$i=$i+20){
imageline($im, $i , 0 , $i , $limit,$gray);
}
for($i=0;$i<=$limit;$i=$i+20)
{
imageline($im, 0 , $i , $limit , $i,$gray);
}
imageline($im, 0, $limit/2, $limit, $limit/2, $xy);imageline($im, $limit/2, 0 , $limit/2, $limit, $xy);$x=1;$y=0;$sublimit=$limit/4;
while($x<23)
{
$x=$x+0.01;
$y=($limit/2)-($x*$x);
//imageline($im, $x+($limit/2), $y, $x+($limit/2), $y, $for);
imagesetpixel ( $im , $x+($limit/2) , $y , $for );
}
while($x>-23)
{
$x=$x-0.01;
$y=($limit/2)-($x*$x);
imagesetpixel ( $im , $x+($limit/2) , $y , $for );
}
imagestring($im,5,($limit-($limit/4))-100,($limit-($limit/4)),"By Chetan Mendhe Y=X*X Equation" , imagecolorallocate($im,225,225,225));
header('Content-type: image/png');
imagepng($im);
exit;
?>