后台漂亮模板之三(网上收集整理)

<?php Function getRandNumber ($fMin, $fMax) { srand((double)microtime()*1000000); $fLen = "%0 ".strlen($fMax). "d "; Return sprintf($fLen, rand($fMin,$fMax)); } $str=getRandNumber(1000,9999); setcookie("chknumber",$str); $width = 45; $height = 18; @header("Content-Type:image/png"); $im=imagecreate($width,$height); $back=imagecolorallocatealpha($im,0,0,0,127); $font=imagecolorallocate($im,255,255,255); imagestring($im, 5, 5, 4,$str, $font); imagepng($im); imagedestroy($im); ?>