PHP implements base64 image upload method-PHP Tutorial-php.cn

PHP implements base64 image upload method

高洛峰

Release： 2023-03-06 06:18:02

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In this example, File Post is not used to upload files! The principle is the same. In order to better understand base64, choose to output it in the text field and submit it to the server! It is recommended to submit File when applied to projects.

html code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>简单的html5 File测试 for pic2base64</title> 
<style> 
</style> 
<script> 
  window.onload = function(){ 
    var input = document.getElementById("demo_input"); 
    var result= document.getElementById("result"); 
    var img_area = document.getElementById("img_area"); 
    if ( typeof(FileReader) === &#39;undefined&#39; ){
      result.innerHTML = "抱歉，你的浏览器不支持 FileReader，请使用现代浏览器操作！"; 
      input.setAttribute(&#39;disabled&#39;,&#39;disabled&#39;); 
    }else{
      input.addEventListener(&#39;change&#39;,readFile,false);
    } 
  }
  function readFile(){
    var file = this.files[0]; 
    //这里我们判断下类型如果不是图片就返回 去掉就可以上传任意文件  
    if(!/image\/\w+/.test(file.type)){
      alert("请确保文件为图像类型"); 
      return false; 
    }
    var reader = new FileReader(); 
    reader.readAsDataURL(file); 
    console.log();
    reader.onload = function(e){ 
        result.innerHTML = this.result; 
        img_area.innerHTML = &#39;<p class="sitetip">图片img标签展示：</p>![](&#39;+this.result+&#39;)&#39;; 
    }
  } 
</script> 
</head>

<body> 
  <form action="file.php" method="post">
  <input type="file" value="sdgsdg" id="demo_input" /> 
  <textarea name="img" id="result" rows=30 cols=300></textarea> 
  <p id="img_area"></p> 
  <input type="submit" value="提交">
</form>
</body> 
</html>

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PHP function block code

<?php
/**
 * base64图片上传
 * @param $base64_img
 * @return array
 */
$base64_img = trim($_POST[&#39;img&#39;]);
$up_dir = &#39;./upload/&#39;;//存放在当前目录的upload文件夹下

if(!file_exists($up_dir)){
  mkdir($up_dir,0777);
}

if(preg_match(&#39;/^(data:\s*image\/(\w+);base64,)/&#39;, $base64_img, $result)){
  $type = $result[2];
  if(in_array($type,array(&#39;pjpeg&#39;,&#39;jpeg&#39;,&#39;jpg&#39;,&#39;gif&#39;,&#39;bmp&#39;,&#39;png&#39;))){
    $new_file = $up_dir.date(&#39;YmdHis_&#39;).&#39;.&#39;.$type;
    if(file_put_contents($new_file, base64_decode(str_replace($result[1], &#39;&#39;, $base64_img)))){
      $img_path = str_replace(&#39;../../..&#39;, &#39;&#39;, $new_file);
      echo &#39;图片上传成功</br>![](&#39; .$img_path. &#39;)&#39;;
    }else{
          echo &#39;图片上传失败</br>&#39;;

    }
  }else{
    //文件类型错误
  echo &#39;图片上传类型错误&#39;;
  }

}else{
  //文件错误
  echo &#39;文件错误&#39;;
}

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The example effect is as follows:

PHP implements base64 image upload method

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