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That’s it. Today I wrote a PHP template for generating verification codes based on the information on the Internet:

<?php
// 獲取驗(yàn)證碼（參數(shù):驗(yàn)證碼個(gè)數(shù)，驗(yàn)證碼寬度，驗(yàn)證碼高度）
function getCode($num = 4, $width = 100, $height = 30){
    session_start();
    $authcode='';
    // 生成驗(yàn)證碼
    for($i=0;$i<$num;$i++){
        switch(rand(0,1))
        {
            case  0:$authcode[$i]=chr(rand(48,57));break; // 數(shù)字
            case  1:$authcode[$i]=chr(rand(65,90));break; // 大寫字母
            //case  2:$authcode[$i]=chr(rand(97,122));break; // 小寫字母
        }
    }
    $_SESSION["AuthCode"]=$authcode;
    $image=imagecreate($width,$height); // 賦值寬度，高度
    imagecolorallocate($image,255,255,255); // 設(shè)定圖片背景顏色
    // 生成干擾像素
    for($i=0;$i<80;$i++){
        $dis_color=imagecolorallocate($image,rand(0,2555),rand(0,255),rand(0,255));
        imagesetpixel($image,rand(1,$width),rand(1,$height),$dis_color);
    }
    // 打印字符到圖像
    for($i=0;$i<$num;$i++){
        $char_color=imagecolorallocate($image,rand(0,2555),rand(0,255),rand(0,255));
        imagechar($image,60,($width/$num)*$i,rand(0,5),$authcode[$i],$char_color);
    }
    
    // 將圖片直接輸出
    header("Content-type:image/png");
    imagepng($image);//輸出圖像到瀏覽器
    imagedestroy($image);//釋放資源
}
getCode();

But I don’t want him to output the image directly, but output the image in base64. How should I do it? I have tried many methods without success, unless it is necessary: ??

$img_file = 'https://www.xxxxxxxxxx.com/authcode.php';
$img_info = getimagesize($img_file);
$img_src = "data:{$img_info['mime']};base64," . base64_encode(file_get_contents($img_file));
echo "<img src='{$img_src}' />";

How can I directly output base64 in getCode?