How to convert an image to base64 encoding?

问题:

Can you please guide me how can I convert an image from a URL to base64 encoding?

回答1:

I think that it should be:

$path = \'myfolder/myimage.png\';
$type = pathinfo($path, PATHINFO_EXTENSION);
$data = file_get_contents($path);
$base64 = \'data:image/\' . $type . \';base64,\' . base64_encode($data);

回答2:

Easy:

$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.

回答3:

Use also this way to represent image in base64 encode format... find PHP function file_get_content and next to use function 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.

// 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4:

Just in case you are (for whatever reason) unable to use curl nor file_get_contents, you can work around:

$img = imagecreatefrompng(\'...\');
ob_start();
imagepng($img);
$bin = ob_get_clean();
$b64 = base64_encode($bin);

回答5:

<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.

Just replaced IMAGE URL HERE with the URL of your image - http://www.website.com/image.jpg

回答6:

Very simple and to be commonly used:

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).

回答7:

Here is an example using a cURL call.. This is better than the file_get_contents() function. Of course, use 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8:

Here is the code for upload to encode and save it to the MySQL

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

echo \"<img src=\'data:image/jpeg;base64, $image\' width=300>\";

回答9:

You can also do this via curl, just you need a path to an image file and pass it to the function given below..

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;

}