Show image using file_get_contents

Question

how can I display an image retrieved using file_get_contents in php?

Do i need to modify the headers and just echo it or something?

Thanks!

Encroach

Answer 1

Do i need to modify the headers and just echo it or something?

exactly.

Send a header("content-type: image/your_image_type"); and the data afterwards.

Milden

alright, and Header("Content-Type: image/jpg"); should be sufficient? – Encroach

@Belgin if it's a JPG image, yes. – Milden

doesn't it need to image/jpeg ? – Boilermaker

Answer 2

You can use readfile and output the image headers which you can get from getimagesize like this:

$remoteImage = "http://www.example.com/gifs/logo.gif";
$imginfo = getimagesize($remoteImage);
header("Content-type: {$imginfo['mime']}");
readfile($remoteImage);

The reason you should use readfile here is that it outputs the file directly to the output buffer where as file_get_contents will read the file into memory which is unnecessary in this content and potentially intensive for large files.

Psychosexual

This solution is much better as the image headers are passed dynamically. Though I did find one issue with it: in my version of PHP the third line (the header line) was not accepted syntax. This worked though: header("Content-type: ".$imginfo['mime']); – Laris

For those who are receiving the error "the image cannot be displayed" or just an "empty screen". Just start your document with <?php followed by the code to display the image, without any html code before. – Perusse

Answer 3

$image = 'http://images.itracki.com/2011/06/favicon.png';
// Read image path, convert to base64 encoding
$imageData = base64_encode(file_get_contents($image));

// Format the image SRC:  data:{mime};base64,{data};
$src = 'data: '.mime_content_type($image).';base64,'.$imageData;

// Echo out a sample image
echo '<img src="' . $src . '">';

Anette

I used this to make google staticmaps work in Safari and Chrome, works perfectly. – Endamoeba

Answer 4

You can do that, or you can use the readfile function, which outputs it for you:

header('Content-Type: image/x-png'); //or whatever
readfile('thefile.png');
die();

Edit: Derp, fixed obvious glaring typo.

Irruptive

Answer 5

you can do like this :

<?php
    $file = 'your_images.jpg';

    header('Content-Type: image/jpeg');
    header('Content-Length: ' . filesize($file));
    echo file_get_contents($file);
?>

Thatcher

Answer 6

we can identify Mime type using File Signature. refer this for know more about what is file signatures

function getBytesFromHexString($hexdata)
{
    for($count = 0; $count < strlen($hexdata); $count+=2)
        $bytes[] = chr(hexdec(substr($hexdata, $count, 2)));
    
    return implode($bytes);
}

function getImageMimeType($imagedata)
{
    $imagemimetypes = [
        "jpeg" => "FFD8", 
        "png" => "89504E470D0A1A0A", 
        "gif" => "474946",
        "bmp" => "424D", 
        "tiff" => "4949",
        "tiff" => "4D4D"
    ];
 
    foreach ($imagemimetypes as $mime => $hexbytes)
    {
        $bytes = getBytesFromHexString($hexbytes);
        if (substr($imagedata, 0, strlen($bytes)) == $bytes)
            return $mime;
    }
  
    return NULL;
}

$uri = "your img url";

if($img = file_get_contents($uri)) {
    echo $mimeType = $this->getImageMimeType($img);
}

for more details see here

Ridgway

Answer 7

prevent ddos

function view_file($f){
        if(is_file($f)){
            $ext=strtolower(pathinfo($f,PATHINFO_EXTENSION));
            $gambar=array('jpg','jpeg','jpe','jif','jfif','jfi','png','gif','webp','tiff','tif','bmp','dib','heif','heic','jp2','j2k','jpf','jpx','jpm','mj2','svg','svgz');
            $video=array('webm','mpg','mp2','mpeg','mpe','mpv','ogg','mp4','m4p','m4v','avi','avi','mov','qt','flv','swf');
            $audio=array('wav','aif','mp3','mid');
            $t=24;
            $time=time();
            $interval=3600*$t;
            if(isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])){
                $modified_time=@$_SERVER['HTTP_IF_MODIFIED_SINCE'];
                if(strtotime($modified_time)+$interval>time()){
                    header("HTTP/1.1 304");
                }
            }
            header('Cache-Control: public');
            header('Last-Modified: '.gmdate('r',$time));
            header('Expires: '.gmdate('r',($time+$interval)));
            header('Cache-Control: max-age='.$interval);
            $c=' style="margin:0;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);">';
            $_64='src="data:'.$ext.';base64,'.base64_encode(file_get_contents($f)).'"';
            if(in_array($ext,$gambar)){
                $s='<div'.$c.'<img '.$_64.'></div>';
            }elseif(in_array($ext,$video)){
                $s='<video style="position:fixed;right:0;bottom:0;min-width:90%;min-height:90%;width:auto;height:auto;z-index:-100;" controls autoplay loop playsinline>'.
                    '<source '.$_64.' type="video/'.$ext.'"></video>';
            }elseif(in_array($ext,$audio)){
                $s='<div'.$c.'<h4>'.$f.'</h4><audio controls autoplay loop><source '.$_64.' type="audio/'.$ext.'"></audio></div>';
            }else{
                setlocale(LC_ALL,'en_US.UTF-8');
                $s='<pre style="line-height:unset;background-color:#fff">'.mb_convert_encoding(highlight_string(file_get_contents($f),1),'ISO-8859-2','UTF-8').'</pre>';
            }
            return(die($s));
        }else{return(false);}
    }

Fortify