Crop image in circle (php)

问题

The following code works on my laptop but doesn't work on remote server:

<?php
error_reporting(E_ALL);
ini_set('display_errors', '1');

$filename = "../../content/".base64_decode($_GET["file"]);


$ext = pathinfo($filename, PATHINFO_EXTENSION);

if ($ext=="jpg" || $ext=="jpeg") {
$image_s = imagecreatefromjpeg($filename);
} else if ($ext=="png") {
$image_s = imagecreatefrompng($filename);
}

$width = imagesx($image_s);
$height = imagesy($image_s);


$newwidth = 285;
$newheight = 232;

$image = imagecreatetruecolor($newwidth, $newheight);
imagealphablending($image,true);
imagecopyresampled($image,$image_s,0,0,0,0,$newwidth,$newheight,$width,$height);

// create masking
$mask = imagecreatetruecolor($width, $height);
$mask = imagecreatetruecolor($newwidth, $newheight);



$transparent = imagecolorallocate($mask, 255, 0, 0);
imagecolortransparent($mask, $transparent);



imagefilledellipse($mask, $newwidth/2, $newheight/2, $newwidth, $newheight, $transparent);



$red = imagecolorallocate($mask, 0, 0, 0);
imagecopy($image, $mask, 0, 0, 0, 0, $newwidth, $newheight);
imagecolortransparent($image, $red);
imagefill($image,0,0, $red);

// output and free memory
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
imagedestroy($mask);
?>

It shows the following image on my laptop: http://i.stack.imgur.com/Aai1r.png

And this is how it's shown on remote server: http://i.stack.imgur.com/77fbV.png

What do you think? What's a problem?

回答1:

Changed the line:

imagecopy($image, $mask, 0, 0, 0, 0, $newwidth, $newheight);

to:

imagecopymerge($image, $mask, 0, 0, 0, 0, $newwidth, $newheight,100);

回答2:

I think a basic reading of how to debug http://blog.regehr.org/archives/199 would be useful to you, and help you to solve your problem

回答3:

I think you might have problems with filepath. Check if pathinfo returns valid extension and add after $filename declaration something to check if it exists and is readable

if(!is_file($file) || !is_readable($file)){ die('Readable file not found');}

来源：https://stackoverflow.com/questions/9880503/crop-image-in-circle-php