/**
* Proportionally resize an image file
*
* @param string $format
* @param string $fullpath
* @param int $MAX_W (optional)
* @param int $MAX_H (optional)
*
* @throws \Exception
*/
function resize_down($format, $fullpath, $MAX_W = 1024, $MAX_H = 1024)
{
if ($format == 'jpg') {
$format = 'jpeg';
}
// fix stupid mistake
if (!($format == 'jpeg' || $format == 'gif' || $format == 'png')) {
throw new \Exception('Invalid image format');
}
/* Try to avoid problems with memory limit */
fudge_factor($format, $fullpath);
/* Proceed with resizing */
$func = 'imagecreatefrom' . $format;
$src = $func($fullpath);
if (!$src) {
throw new \Exception('Invalid image format');
}
list($orig_w, $orig_h) = getimagesize($fullpath);
$ratio = $orig_w * 1.0 / $orig_h;
$w_oversized = $orig_w > $MAX_W;
$h_oversized = $orig_h > $MAX_H;
if ($w_oversized || $h_oversized) {
$new_w = round(min($MAX_W, $ratio * $MAX_H));
$new_h = round(min($MAX_H, $MAX_W / $ratio));
} else {
return;
// Do nothing, image is small enough already
}
$dst = imagecreatetruecolor($new_w, $new_h);
imagecopyresampled($dst, $src, 0, 0, 0, 0, $new_w, $new_h, $orig_w, $orig_h);
imagedestroy($src);
$func = 'image' . $format;
$func($dst, $fullpath);
imagedestroy($dst);
}
/**
* Proportionally resize an image file
*
* @param string $format
* @param string $fullpath
* @param int $MAX_W (optional)
* @param int $MAX_H (optional)
*
* @throws \Exception
*/
function resize_down($format, $fullpath, $MAX_W = 1024, $MAX_H = 1024)
{
if ('jpg' == $format) {
$format = 'jpeg';
// fix stupid mistake
}
if (!('jpeg' == $format || 'gif' == $format || 'png' == $format)) {
throw new \Exception('Invalid image format');
}
/* Try to avoid problems with memory limit */
fudge_factor($format, $fullpath);
/* Proceed with resizing */
$func = 'imagecreatefrom' . $format;
$src = $func($fullpath);
// try again, but ignore warnings for jpeg only
if (!$src && 0 === strcmp('jpeg', $format)) {
ini_set('gd.jpeg_ignore_warning', 1);
$src = '@' . $func($fullpath);
}
// try again, but replace with placeholder image
if (!$src) {
$src = imagecreatetruecolor(150, 100);
$bkgd_color = imagecolorallocate($src, 255, 255, 255);
$font_color = imagecolorallocate($src, 0, 0, 0);
imagefilledrectangle($src, 0, 0, 150, 100, $bkgd_color);
imagestring($src, 3, 5, 5, 'Error loading image', $font_color);
}
list($orig_w, $orig_h) = getimagesize($fullpath);
$ratio = $orig_w * 1.0 / $orig_h;
$w_oversized = $orig_w > $MAX_W;
$h_oversized = $orig_h > $MAX_H;
if ($w_oversized || $h_oversized) {
$new_w = round(min($MAX_W, $ratio * $MAX_H));
$new_h = round(min($MAX_H, $MAX_W / $ratio));
} else {
return;
// Do nothing, image is small enough already
}
$dst = imagecreatetruecolor($new_w, $new_h);
imagecopyresampled($dst, $src, 0, 0, 0, 0, $new_w, $new_h, $orig_w, $orig_h);
imagedestroy($src);
$func = 'image' . $format;
$func($dst, $fullpath);
imagedestroy($dst);
}