How to solve the problem of garbled php verification code

Solution to garbled php verification code: 1. Modify the path to access the verification code generation method function; 2. Modify the file encoding and remove the BOM header; 3. Check the verification code generation method; 4. Modify the service environment .

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Specific questions:

php verification code output It’s all gibberish...

<?php
session_start();
header("content-type:image/png"); //设置创建图像的格式
$image_width=70; //设置图像宽度
$image_height=18; //设置图像高度
srand(microtime()*100000); //设置随机数的种子
for($i=0;$i<4;$i++){ //循环输出一个4位的随机数
$new_number.=dechex(rand(0,15));
}
$_SESSION[check_checks]=$new_number; //将获取的随机数验证码写入到SESSION变量中

$num_image=imagecreate($image_width,$image_height); //创建一个画布
imagecolorallocate($num_image,255,255,255); //设置画布的颜色
for($i=0;$i<strlen($_SESSION[check_checks]);$i++){ //循环读取SESSION变量中的验证码
$font=mt_rand(3,5); //设置随机的字体
$x=mt_rand(1,8)+$image_width*$i/4; //设置随机字符所在位置的X坐标
$y=mt_rand(1,$image_height/4); //设置随机字符所在位置的Y坐标
$color=imagecolorallocate($num_image,mt_rand(0,100),mt_rand(0,150),mt_rand(0,200)); //设置字符的颜色
imagestring($num_image,$font,$x,$y,$_SESSION[check_checks][$i],$color); //水平输出字符
}
imagepng($num_image); //生成PNG格式的图像
imagedestroy($num_image); //释放图像资源
?>

Solution:

1. The path to access the verification code generation method/function is incorrect;

2.The file encoding is incorrect, UTF8 encoding does not remove the BOM header;

3. There is a problem with the verification code generation method.

4. The environment does not support it.

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