Simple example of PHP verification code implementation code_PHP tutorial

I have talked about many examples of PHP verification codes. Below I will share a good PHP verification code program from a friend. It is quite simple and you can refer to it.

I have been bored recently and have nothing to do, so I started to share some PHP code. The codes are relatively simple, but more practical.

This was written four years ago. A few lines of code implement the four-digit random number PHP verification code function.

The code is as follows  代码如下 复制代码 session_start(); header("Content-type: image/jpeg"); $img = imagecreate(50,20); $white = imagecolorallocate($img,211,213,193); imagefill($img,0,0,$white); for($i=0;$i<4;$i++){ $r[$i] = rand(0,9); } $_SESSION['valid'] = implode("",$r); //在这里写入到session可做后期验证 for($i=0;$i<4;$i++){ if(rand(0,9)%2==0){ imagechar($img,5,($i+1)*8,4,$r[$i],imagecolorallocate($img,rand(0,150),rand(0,150),rand(0,150))); }else{ imagechar($img,5,($i+1)*8,2,$r[$i],imagecolorallocate($img,rand(0,150),rand(0,150),rand(0,150))); } } imagejpeg($img);

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session_start();
header("Content-type: image/jpeg");
$img = imagecreate(50,20);
$white = imagecolorallocate($img,211,213,193);
imagefill($img,0,0,$white);
for($i=0;$i<4;$i++){
$r[$i] = rand(0,9);
}
$_SESSION['valid'] = implode("",$r); //Write to session here for later verification
for($i=0;$i<4;$i++){

if(rand(0,9)%2==0){
imagechar($img,5,($i+1)*8,4,$r[$i],imagecolorallocate($img,rand(0,150),rand(0,150),rand(0,150)));
}else{
imagechar($img,5,($i+1)*8,2,$r[$i],imagecolorallocate($img,rand(0,150),rand(0,150),rand(0,150)));
}

www.bkjia.comhttp: //www.bkjia.com/PHPjc/629610.htmlTechArticleI have talked about many examples of PHP verification code. Now I will share a good PHP verification code program from a friend. , it is quite simple, friends can refer to it. I've been bored and had nothing to do lately, so I started doing some php...