PHP full probability calculation functions (optimized version) are essential for Webgame development. For more information, see.
PHP full probability calculation functions (optimized version) are essential for Webgame development. For more information, see.
The Code is as follows:
$ Setting = array (
// Black Probability
0 => 0.99,
// White Probability
1 => 0.01,
);
// Requires the GD Library
Header ("Content-type: image/png ");
$ Im = imagecreatetruecolor (256,256) or die ("Cannot Initialize new GD image stream ");
$ White = imagecolorallocate ($ im, 255,255,255 );
$ Start = microtime (true );
For ($ y = 0 ;y y <256; $ y ++ ){
For ($ x = 0; $ x <256; $ x ++ ){
If (random ($ setting) === 1 ){
Imagesetpixel ($ im, $ x, $ y, $ white );
}
}
}
$ Time = microtime (true)-$ start;
Header ("X-Exec-Time:". $ time );
Imagepng ($ im );
Imagedestroy ($ im );
/**
* Full Probability Calculation
*
* @ Param array $ p array ('A' => 0.5, 'B' => 0.2, 'c' => 0.4)
* @ Return string returns the key of the preceding array.
* @ Author Lukin
*/
Function random ($ ps ){
Static $ arr = array (); $ key = md5 (serialize ($ ps ));
If (! Isset ($ arr [$ key]) {
$ Max = array_sum ($ ps );
Foreach ($ ps as $ k => $ v ){
$ V = $ v/$ max * 10000;
For ($ I = 0; $ I <$ v; $ I ++) $ arr [$ key] [] = $ k;
}
}
Return $ arr [$ key] [mt_rand (0, count ($ arr [$ key])-1)];
}
?>
Black spots have a probability of 99%, and white spots have a probability of 1%. Test results:
