php 如何将图像转换为 base64 编码？
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How to convert an image to base64 encoding?
提问by Volatil3
Can you please guide me how can I convert an image from a URL to base64 encoding?
你能指导我如何将图像从 URL 转换为 base64 编码吗？
回答by Ronny Sherer
I think that it should be:
我认为应该是：
$path = 'myfolder/myimage.png';
$type = pathinfo($path, PATHINFO_EXTENSION);
$data = file_get_contents($path);
$base64 = 'data:image/' . $type . ';base64,' . base64_encode($data);
回答by Pekka
Easy:
简单：
$imagedata = file_get_contents("/path/to/image.jpg");
// alternatively specify an URL, if PHP settings allow
$base64 = base64_encode($imagedata);
bear in mind that this will enlarge the data by 33%, and you'll have problems with files whose size exceed your memory_limit.
请记住，这会将数据放大 33%，并且文件大小超过memory_limit.
回答by Raju Rajotia Jangid
Use also this way to represent image in base64 encode format...
find PHP function file_get_contentand next to use function base64_encode
也使用这种方式以base64编码格式表示图像...找到PHP函数file_get_content，然后使用函数base64_encode
and get result to prepare str as data:" . file_mime_type . " base64_encoded string. Use it in img src attribute. see following code can I help for you.
并获得结果以将 str 准备为data:" . file_mime_type . " base64_encoded string. 在 img src 属性中使用它。请参阅以下代码，我可以为您提供帮助。
// A few settings
$img_file = 'raju.jpg';
// Read image path, convert to base64 encoding
$imgData = base64_encode(file_get_contents($img_file));
// Format the image SRC: data:{mime};base64,{data};
$src = 'data: '.mime_content_type($img_file).';base64,'.$imgData;
// Echo out a sample image
echo '<img src="'.$src.'">';
回答by yckart
Just in case you are (for whatever reason) unable to use curlnor file_get_contents, you can work around:
以防万一您（无论出于何种原因）无法使用curlnor file_get_contents，您可以解决：
$img = imagecreatefrompng('...');
ob_start();
imagepng($img);
$bin = ob_get_clean();
$b64 = base64_encode($bin);
回答by GoldenGonaz
<img src="data:image/png;base64,<?php echo base64_encode(file_get_contents("IMAGE URL HERE")) ?>">
I was trying to use this resource but kept getting an error, I found the code above worked perfectly.
我试图使用此资源但一直出错，我发现上面的代码运行良好。
Just replaced IMAGE URL HERE with the URL of your image - http://www.website.com/image.jpg
刚刚用您的图片的网址替换了此处的图片网址 - http://www.website.com/image.jpg
回答by Reza Mamun
Very simple and to be commonly used:
非常简单，常用：
function getDataURI($imagePath) {
$finfo = new finfo(FILEINFO_MIME_TYPE);
$type = $finfo->file($imagePath);
return 'data:'.$type.';base64,'.base64_encode(file_get_contents($imagePath));
}
//Use the above function like below:
echo '<img src="'.getDataURI('./images/my-file.svg').'" alt="">';
echo '<img src="'.getDataURI('./images/my-file.png').'" alt="">';
Note: The Mime-Type of the file will be added automatically (taking help from this PHP documentation).
注意：文件的 Mime-Type 将自动添加（从这个PHP 文档中获取帮助）。
回答by Vivek
Here is the code for upload to encode and save it to the MySQL
这是上传编码并保存到MySQL的代码
if (!isset($_GET["getfile"])) {
if ($_FILES["file"]["error"] > 0) {
echo "Error: " . $_FILES["file"]["error"] . "<br>";
} else {
move_uploaded_file($_FILES["file"]["tmp_name"], $_FILES["file"]["name"]);
$bin_string = file_get_contents($_FILES["file"]["name"]);
$hex_string = base64_encode($bin_string);
$mysqli = mysqli_init();
if (!$mysqli->real_connect('localhost', 'root', '', 'arihant')) {
die('Connect Error (' . mysqli_connect_errno() . ') ' . mysqli_connect_error());
}
$mysqli->query("INSERT INTO upload(image) VALUES ('" . $hex_string . "')");
}
}
For showing the image use this
为了显示图像使用这个
echo "<img src='data:image/jpeg;base64, $image' width=300>";
回答by JeanAlesi
Here is an example using a cURL call.. This is better than the file_get_contents()function. Of course, use base64_encode()
这是一个使用 cURL 调用的示例。这比file_get_contents()函数更好。当然，使用base64_encode()
$url = "http://example.com";
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$output = curl_exec($ch);
curl_close($ch);
?>
<img src="data:image/png;base64,<?php echo base64_encode($output);?>">
回答by Tayyab Hussain
You can also do this via curl, just you need a path to an image file and pass it to the function given below..
您也可以通过 curl 执行此操作，只需要一个图像文件的路径并将其传递给下面给出的函数。
public static function getImageDataFromUrl($url)
{
$urlParts = pathinfo($url);
$extension = $urlParts['extension'];
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_HEADER, 0);
$response = curl_exec($ch);
curl_close($ch);
$base64 = 'data:image/' . $extension . ';base64,' . base64_encode($response);
return $base64;
}
