Image verification code reports error after using session

Question

This is the effect without opening the session (the picture of the verification code can be displayed normally)

#--------------------------Gorgeous dividing line- ----------------------------------------

This is the effect after opening the session (no picture is displayed)

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Excuse me why is this

Source code respectfully

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<?php

session_start() ;

$width = 300;

$height = 100;

$img = imagecreatetruecolor($width,$height);

$white = imagecolorallocate($img, 255, 255, 255);

$red = imagecolorallocate($img, 255, 0, 0);

imagefilledrectangle($img, 0, 0, $width , $height, setColor($img));

function setColor($img)

{

return imagecolorallocate($img,getColor(),getColor(), getColor());

}

function getColor()

{

return mt_rand(0,255);

}

function setNum($a,$b)

{

return mt_rand($a,$b);

}

function getCode()

{

return $string = join('',array_rand(array_flip(array_merge(range(0,9),range('a','z'),range ('A','Z'))),4));

}

$str = getCode();

$_SESSION['verifycode'] = $str;

for($i=0;$i<4;$i )

{

$size = setNum(20,50);

$angle = setNum(-15,15);

$x = ($width/4)*$i mt_rand(1,9);

$y = mt_rand( ($height/2),$height);

$color = setColor( $img );

$fontfile = './fonts/MSYH.ttf';

$text = mb_substr(getCode(),$i,1,'utf-8');

imagettftext($img, $size, $angle, $x, $y, $color, $fontfile , $text);

}

for($i=0;$i<1500;$i )

{

imagesetpixel($img, mt_rand(0, $width), mt_rand(0, $height), setColor($img));

}

for($i=0;$i<3;$i )

{

imageline($img, mt_rand(0, $width), mt_rand(0,$height), mt_rand(0, $width), mt_rand(0,$height), setColor($img));

}

for($i=0;$i<3;$i )

{

$cx = mt_rand(0, $width);

$cy = mt_rand(0, $height);

$width = mt_rand(0, $width/2);

$height = mt_rand(0, $height/2);

$start = mt_rand(0, 360);

$end = mt_rand(0, 360);

$color = setColor($img);

imagearc($img, $cx, $cy, $width, $height, $start, $end, $color);

}

header('content-type:image/jpeg');

imagejpeg( $img );

imagedestroy( $img );

?>

Answer 1

It should be automatically deleted, right? Temporary files.
In addition, you can also consider database storage session?

Answer 2

I think you are not dealing with a problem that has gone wrong now. It is recommended that you start with a simple picture verification and think about it first. This is very necessary. Just remove other useless code. Already registered and verified user password. Let’s try this picture SESSION issue alone. Do you need to register a hidden domain?