php如何实现将图片转换base64编码

/*图片转换为 base64格式编码*/
$img = 'uploads/01.png';
$base64_img = base64EncodeImage($img);
echo '<img src="' . $base64_img . '" />';
 
function base64EncodeImage ($image_file) {
 $base64_image = '';
 $image_info = getimagesize($image_file);
 $image_data = fread(fopen($image_file, 'r'), filesize($image_file));
 $base64_image = 'data:' . $image_info['mime'] . ';base64,' . chunk_split(base64_encode($image_data));
 return $base64_image;
}

/* base64格式编码转换为图片并保存对应文件夹 */
function base64_image_content($base64_image_content,$path){
 //匹配出图片的格式
 if (preg_match('/^(data:s*image/(w+);base64,)/', $base64_image_content, $result)){
 $type = $result[2];
 $new_file = $path."/".date('Ymd',time())."/";
 if(!file_exists($new_file)){
 //检查是否有该文件夹，如果没有就创建，并给予最高权限
 mkdir($new_file, 0700);
 }
 $new_file = $new_file.time().".{$type}";
 if (file_put_contents($new_file, base64_decode(str_replace($result[1], '', $base64_image_content)))){
 return '/'.$new_file;
 }else{
 return false;
 }
 }else{
 return false;
 }
}
 
echo base64_image_content($base64_img,"uploads/");