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【PHP】算式验证码

作者:王鹏婷 / 发布于2015/1/12/ 669


	<?php
	session_start();
	header("Content-type: image/png");
	
	$num1 = mt_rand(0,9);//第一位数
	$num2 = mt_rand(1,9);//第二位数
	
	$type_str = "+-*";//方法字符串集合
	$type = substr($type_str,rand(0,2),1);//随机方法
	
	$change = mt_rand(1,3);
	
	if($change==1){
	 $code = "$num1$type$num2=?";
	 $result = "\$verifyCode=$num1$type$num2;";
	 eval($result);
	
	 $_SESSION['authnum_session'] = $verifyCode;
	}elseif($change==2){
	 $result = "\$verifyCode=$num1$type$num2;";
	 eval($result);
	 $code = $num1.$type."_=".$verifyCode;
	 $_SESSION['authnum_session'] = $num2;
	
	}elseif($change==3){
	 $result = "\$verifyCode=$num1$type$num2;";
	 eval($result);
	 $code = "_".$type.$num2."=".$verifyCode;
	 $_SESSION['authnum_session'] = $num1;
	}
	
	
	
	$im = imagecreate(68,28);
	$black = imagecolorallocate($im, 0,0,0);
	$white = imagecolorallocate($im, 255,255,255);
	$gray = imagecolorallocate($im, 200,200,200);
	$red = imagecolorallocate($im, 255, 0, 0);
	
	imagefill($im,0,0,$white);
	imagestring($im, 5, 10, 8, $code, $black);
	
	for($i=0;$i<70;$i++) {
	 imagesetpixel($im, mt_rand(0, 58) , mt_rand(0, 28) , $black);
	 imagesetpixel($im, mt_rand(0, 58) , mt_rand(0, 28) , $red);
	 imagesetpixel($im, mt_rand(0, 58) , mt_rand(0, 28) , $gray);
	
	}
	
	imagepng($im);
	imagedestroy($im);
	
	?>

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　算式验证码　

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