PHP+javascript creates verification code with prompts source code sharing_PHP tutorial

html代码：

复制代码 代码如下:

   
     
     
     
     
     
     

验证码：

<script>yzm()</script>

看不清

请输入验证码

 

JS代码：

复制代码 代码如下:

function chkyzm(form){     //对验证码进行验证
 if(form.yzm.value==""){
  yzm1.innerHTML="×验证码不能为空";
 }else if(form.yzm.value!=form.yzm2.value){
  yzm1.innerHTML="×验证码输入错误";
 }else{
  yzm1.innerHTML="√验证码输入正确";
 }
}
function yzm(){      //生成验证码
 var num1=Math.round(Math.random()*1000000);//随机小数放大
 var num=num1.toString().substr(0,4);//取4位整数
 var yzm2=document.getElementById("yzm2");
 document.write("");
 yzm2.value=num;
}
function code(){      //重置验证码
 var num1=Math.round(Math.random()*1000000);
 var num=num1.toString().substr(0,4);
 var yzm2=document.getElementById("yzm2");
 document.codeimg.src="yzm.php?num="+num;
 yzm2.value=num;
}

yzm.php代码：

复制代码 代码如下:

header("Content-type: image/png");
$im=imagecreate(66,22); //Create canvas
$black=imagecolorallocate ($im,0,0,0); //Define background
$white=imagecolorallocate($im,255,255,255); //Define background
$gray=imagecolorallocate($im,200,200,200); //Definition Background
imagefill($im,0,0,$gray); //Fill color
for($i=0;$i<4;$i++){ //Define 4-digit random number
$str=mt_rand(1,5); //Define the Y coordinate of the random character location
$size=mt_rand(6,9); //Define the font of the random character
$authnum=substr($ _GET[num],$i,1); //Get the verification code passed in the hyperlink
imagestring($im,$size,(3+$i*15),$str,$authnum,imagecolorallocate($ IM, RAND (0,250), RAND (0,250), RAND (0,250)); // RAND (0,500) the blur of the number
} // horizont i<200;$i++){ //Execute the for loop and add a blurred background to the verification code
$randcolor=imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255)); //Create Background
imagesetpixel($im,rand()%70,rand()%30,$randcolor); //Draw a single element
}
imagepng($im); //Generate png image
imagedestroy($im); //Destroy the image
?>

Note: PHP needs to be configured to execute related methods.

Operating effect:

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