Converting a byte array into an image using PHP and HTML

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I\'m using PHP to retrieve data from a SOAP service, part of which is a byte array of an image encoded in base64, and I\'d like to display that image in the browser. The da

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3条回答

爱一瞬间的悲伤

2020-12-03 20:25
You need to base64 encode the data. This is required and ensures that charset conversions don't touch the data.

The correct code should be
```
$imgData = base64_encode($byteArray);
$img = "<img src= 'data:image/jpeg;base64, $imgData' />";
print($img);
```
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悲&欢浪女

2020-12-03 20:36

Here is a complete example of browsing an image file .jpg and converting it into base64 byte format and sending it to server.
Server script php will decode and save image to server.

HTML

<html>
<head>
<script src="jquery.js"></script>
<script>
function getBase64Image()
{
    var files = document.getElementById('file1').files; // FileList object

    // Loop through the FileList and render image files as thumbnails.
    for (var i = 0, f; f = files[i]; i++)
    {
      // Only process image files.
      if (!f.type.match('image.*'))
      {
        continue;
      }

      var reader = new FileReader();

      // Closure to capture the file information.
      reader.onload = (function(theFile) {
        return function(e) {

        var str = e.target.result;
        var res = str.replace("data:image/jpeg;base64,","");
        var res = str.replace("data:base64,","");
         $("#tbx_base64").val(res);
         console.log(e.target)
        };
      })(f);

      // Read in the image file as a data URL.
     reader.readAsDataURL(f);
    }
}

function submitForm(){    

    //SENDING IMAGE FILE WITH JSON OBJECT. YOU CAN ALSO SEND WITHOUT JSON OBJECT.
    var o = {};
    o.name = "Test";
    o.arr = ["lucky_no":323];
    o.upload_image = $("#tbx_base64").val();    
    $.post("http://localhost/jquery_multiple_file_upload/upload.php/", {o:o}, function(data){   
        alert(data) 
    });
}
</script>
</head>
<body>
<form enctype="multipart/form-data"  method="post" id="form_test">
    <input id="file1" type="file" onChange="getBase64Image()"  />
    <textarea id="tbx_base64" style="display:none"></textarea> <!-- TEXTAREA IS HIDE. AS IT IS ONLY USED TO HOLD BYTE DATA -->
    <input type="button" value="Upload File" id="upload" onClick="submitForm();" />
</form>
</body>
</html>

PHP

<?php
    $image_byte_code = $_REQUEST['o'];
    $content = base64_decode($image_byte_code['upload_image']);
    $im = imagecreatefromstring($content);

    if ($im !== false) {
        header('Content-Type: image/jpeg');
        imagejpeg($im, "uploads/1.jpg");
        imagedestroy($im);
    }
    else
    {
        echo 'An error occurred.';
    }
?>

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野性不改

2020-12-03 20:48

If you run this code :

$imgData = "/9j/4AAQSkZJRgABAQEBLAEsAAD/7gAOQWRvYmUAZAAAAAAA/+0TrFBob3Rvc2hvcCAzLjAAOEJJ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AQAAAAAAAAAAAAAF8gAAAUkAAAAAAAAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAQAAAA
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neDxTvyXX//Z";
echo "<img src='data:image/jpeg;base64, $imgData' />";

(Sorry this is a 40x30 pixels image but still huge anyway).

An image will appear.

All of that to say that your syntax is ok :

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

Outputs an image if your $imgData contains a real image.

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