產生圖片隨機字串_php实例
                        
                            时间:2021-07-01 10:21:17
                            帮助过:1人阅读
							                        
                     
                    
                    $base = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';   
$words = 5;   
$rand_top = strlen($base) - 1;   
$string = '';   
header("Content-type: image/png");   
$im = imagecreate($words*16, $words*5);   
$black = imagecolorallocate($im, 90, 60, 120);   
$white = imagecolorallocate($im, 255, 255, 255);   
for($i=0;$i<$words;$i++){   
  $idx = mt_rand(0, $rand_top);   
  imagestring($im, 3, $i*15+2, mt_rand(0, $words*2), $base[$idx], $white);   
}   
imagepng($im);   
imagedestroy($im);   
?>