How to Convert an Image to Base64 Encoding

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.

Also use this way to represent an image in Base64-encoded format...

Find the PHP function file_get_content and next use the function base64_encode.

And get the result to prepare str as data:" . file_mime_type . " base64_encoded string. Use it in the img src attribute. The following code ma be helpful:

// 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.'">';

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);

<img src="data:image/png;base64,<?php echo base64_encode(file_get_contents("IMAGE URL HERE")) ?>">

I was trying to use this resource, but I kept getting an error. I found the code above worked perfectly.

I just replaced "IMAGE URL HERE" with the URL of your image -

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).

Here is the code for uploading to encode and save it to a MySQL database:

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>";

You can also do this via cURL. You just 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;
}

Here is an example using a cURL call... This is better than the file_get_contents() function. Of course, use base64_encode().

<?php
    $url = "";

    $ch = curl_init($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);?>">