Photo Gallery in Miniature

Question

I have the code below, where it connects in the bank, takes the name of the image and saves in an Array:

while($row = $stm->fetch())  {

echo "<img  src=thumb.php?img=".$row['foto']."/>";

}

The file Thumb.php, is who does all the processing of the image to leave in gallery:

    $filename = $_GET['img'];
$percent = 0.10;

// Cabeçalho que ira definir a saida da pagina
header('Content-type: image/jpeg');

// pegando as dimensoes reais da imagem, largura e altura
list($width, $height) = getimagesize($filename);

//setando a largura da miniatura
$new_width = 120;
//setando a altura da miniatura
$new_height = 100;

//gerando a a miniatura da imagem
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

//o 3º argumento é a qualidade da imagem de 0 a 100
imagejpeg($image_p, null, 50);
imagedestroy($image_p);

The images are in the same directory where you have the index.php that connects in the database and shows the gallery and the file Thumb.php.

The problem that does not display the photo and does not generate any error. It brings back the photo comments that are in the database, but the image does not.

Answer 1

The function imagecreatefromjpeg only reads JPEG type documents:

$image = imagecreatefromjpeg($filename);

Files in PNG format will cause failure as it expects a JPEG image.

• For PNG you must use imagecreatefrompng
• For GIF must use imagecreatefromgif
• For JPEG you must use imagecreatefromjpeg

You can use the getimagesize to detect the image type, but it is not as reliable as with fileinfo, then based on this other answer /a/73497/3635 adjust your code like this:

function mimeType($file)
{
    $mimetype = false;

    if (class_exists('finfo')) {//PHP5.4+
        $finfo     = finfo_open(FILEINFO_MIME_TYPE);
        $mimetype  = finfo_file($finfo, $file);
        finfo_close($finfo);
    } else if (function_exists('mime_content_type')) {//php5.3 ou inferiror
        $mimetype = mime_content_type($file);
    }

    return $mimetype;
}

$filename = $_GET['img'];
$percent = 0.10;

//Lê o formato do conteudo da imagem
$mime = mimeType($filename);

if (strpos($mime, 'image/') !== 0) {
    die('Este arquivo não é uma imagem');
}

//Remove o prefixo image/
$mime = substr($mime, 6);

//Remove `x` de x-jpeg, talvez ocorram em alguns servidores antigos
$mime = str_replace('x-', '', $mime);

switch ($mime) {
    case 'jpeg':
        $image = imagecreatefromjpeg($filename);
    break;
    case 'png':
        $image = imagecreatefrompng($filename);
    break;
    case 'gif':
        $image = imagecreatefromgif($filename);
    break;
    default:
        die('Formato não aceito');
}

// Cabeçalho que ira definir a saida da pagina
header('Content-type: image/jpeg');

// pegando as dimensoes reais da imagem, largura e altura
list($width, $height) = getimagesize($filename);

//setando a largura da miniatura
$new_width = 120;
//setando a altura da miniatura
$new_height = 100;

//gerando a a miniatura da imagem
$image_p = imagecreatetruecolor($new_width, $new_height);

imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

//o 3º argumento é a qualidade da imagem de 0 a 100
imagejpeg($image_p, null, 50);
imagedestroy($image_p);