PHP：用passthru显示图像比在磁盘中创建图像更好

Question

i need display modyfied image , i have 2 option as i see it to create temp image that is modified and then delete it or to create the image on the fly and display it with passthru for example :

$photo="foo.jpg";
$THUMB_SZ  = 125;
$THUMB_PRESZ  = $THUMB_SZ * 2;
$QUALITY = 87;
$convert = "/usr/bin/convert";
$command = "$convert -size $THUMB_PRESZ".'x'."$THUMB_PRESZ \"$photo\"" .
        " -thumbnail $THUMB_SZ".'x'."$THUMB_SZ" .
        " -unsharp 0.2x0.6+1.0" .
        " -quality $QUALITY JPG:-";

header("Content-type: image/jpeg");
passthru($command, $retval);

and then in the html part <img src="foo.php">

Answer 1

If you don't need to keep the modified image then using passthru saves a disk write and a delete. Your app is probably not that speed sensitive though.