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)

##---------------------------------- ------------------------------------------

Excuse me why is this

Source code respectfully

------------------ ----------------

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 );

?>