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<?php session_start(); // main $vcodes = ''; //generate Number 4 srand((double) microtime() * 1000000); for ($i = 0; $i < 4; $i++) { $vcodes .= rand(1, 9); } $_SESSION['eifr_checkvcode'] = $vcodes; if (function_exists('imagecreate')) { //generate picture validation code Header("Content-type: image/PNG"); $img = imagecreate(44, 18); $bg = ImageColorAllocate($img, 245, 245, 245); imagefill($img, 0, 0, $bg); //background //generate Number 4 for ($i = 0; $i < 4; $i++) { $font = ImageColorAllocate($img, rand(100, 255), rand(0, 100), rand(100, 255)); $vnum = substr($vcodes, $i, 1); imagestring($img, 5, 2 + $i * 10, 1, $vnum, $font); } //add interference for ($i = 0; $i < 100; $i++) { $randcolor = ImageColorallocate($img, rand(0, 255), rand(0, 255), rand(0, 255)); imagesetpixel($img, rand() % 70, rand() % 30, $randcolor); } ImagePNG($img); ImageDestroy($img); } ?>