How to convert files to base64 encoding format in php-PHP Problem-php.cn

How to convert image files to base64 encoding format in php

PHP has very good support for Base64 and has built-in The base64_encode and base64_decode are responsible for the Base64 encoding and decoding of images.

In terms of encoding, just read the image stream and then use base64_encode to encode it.

/** * 获取图片的Base64编码(不支持url) * @date 2017-02-20 19:41:22 * * @param $img_file 传入本地图片地址 * * @return string */ function imgToBase64($img_file) { $img_base64 = ''; if (file_exists($img_file)) { $app_img_file = $img_file; // 图片路径 $img_info = getimagesize($app_img_file); // 取得图片的大小，类型等 //echo '' . print_r($img_info, true) . '
        
'; $fp = fopen($app_img_file, "r"); // 图片是否可读权限 if ($fp) { $filesize = filesize($app_img_file); $content = fread($fp, $filesize); $file_content = chunk_split(base64_encode($content)); // base64编码 switch ($img_info[2]) { //判读图片类型 case 1: $img_type = "gif"; break; case 2: $img_type = "jpg"; break; case 3: $img_type = "png"; break; } $img_base64 = 'data:image/' . $img_type . ';base64,' . $file_content;//合成图片的base64编码 } fclose($fp); } return $img_base64; //返回图片的base64 } //调用使用的方法 $img_dir = dirname(__FILE__) . '/uploads/img/11213223.jpg'; $img_base64 = imgToBase64($img_dir); echo '
        '; //图片形式展示 echo '
        '; echo $img_base64; //输出Base64编码
        
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The decoding is a little more troublesome. The reason is that after encoding the image into a base64 string, these characters data:image/png;base64 will be added to the encoding, which is originally used for base64 recognition. However, if you put it directly into PHP and use the base64_decode function to decode it, the final saved image file format will be damaged. The solution is to remove this string of characters first:

$base64_string= explode(',', $base64_string); //截取data:image/png;base64, 这个逗号后的字符 $data= base64_decode($base64_string[1]);　　//对截取后的字符使用base64_decode进行解码 file_put_contents($url, $data); //写入文件并保存

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