Generate verification code in php_PHP tutorial

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session_start();

header("content-type:image/png"); Set the format of the generated image here as png

$width=40;//Width

$height=25;//Height

$color="#ffffff";//Color

$num=rand(1000,9999);//Generate a 4-digit random number

$_SESSION['ver']=$num; Verify before saving to session

$img=imagecreate($width,$height);//Use imagecreate to create images

$bg1=imagecolorallocate($img,rand(0,100),rand(0,250),rand(0,255));//Picture color

$bg2=imagecolorallocate($img,rand(0,205),rand(0,250),rand(0,245));

//imageline($img,40,20,40,40,$color);

//imagesetpixel($img,44,44,$color);

imagestring($img,7,4,7,$num,$bg2);//Increase noise

imagepng($img);//Generate image

imagedestroy($img);//Destroy

?>

This is very simple, so I won’t go into details.

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