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<?php
/**
* easy image resize function
* @param $file - file name to resize
* @param $string - The image data, as a string
* @param $width - new image width
* @param $height - new image height
* @param $proportional - keep image proportional, default is no
* @param $output - name of the new file (include path if needed)
* @param $delete_original - if true the original image will be deleted
* @param $use_linux_commands - if set to true will use "rm" to delete the image, if false will use PHP unlink
* @param $quality - enter 1-100 (100 is best quality) default is 100
* @param $grayscale - if true, image will be grayscale (default is false)
* @return boolean|resource
*/
function smart_resize_image($file,
$string = null,
$width = 0,
$height = 0,
$proportional = false,
$output = 'file',
$delete_original = true,
$use_linux_commands = false,
$quality = 100,
$grayscale = false
) {
if ( $height <= 0 && $width <= 0 ) return false;
if ( $file === null && $string === null ) return false;
# Setting defaults and meta
$info = $file !== null ? getimagesize($file) : getimagesizefromstring($string);
$image = '';
$final_width = 0;
$final_height = 0;
list($width_old, $height_old) = $info;
$cropHeight = $cropWidth = 0;
# Calculating proportionality
if ($proportional) {
if ($width == 0) $factor = $height/$height_old;
elseif ($height == 0) $factor = $width/$width_old;
else $factor = min( $width / $width_old, $height / $height_old );
$final_width = round( $width_old * $factor );
$final_height = round( $height_old * $factor );
}
else {
$final_width = ( $width <= 0 ) ? $width_old : $width;
$final_height = ( $height <= 0 ) ? $height_old : $height;
$widthX = $width_old / $width;
$heightX = $height_old / $height;
$x = min($widthX, $heightX);
$cropWidth = ($width_old - $width * $x) / 2;
$cropHeight = ($height_old - $height * $x) / 2;
}
# Loading image to memory according to type
switch ( $info[2] ) {
case IMAGETYPE_JPEG: $file !== null ? $image = imagecreatefromjpeg($file) : $image = imagecreatefromstring($string); break;
case IMAGETYPE_GIF: $file !== null ? $image = imagecreatefromgif($file) : $image = imagecreatefromstring($string); break;
case IMAGETYPE_PNG: $file !== null ? $image = imagecreatefrompng($file) : $image = imagecreatefromstring($string); break;
default: return false;
}
# Making the image grayscale, if needed
if ($grayscale) {
imagefilter($image, IMG_FILTER_GRAYSCALE);
}
# This is the resizing/resampling/transparency-preserving magic
$image_resized = imagecreatetruecolor( $final_width, $final_height );
if ( ($info[2] == IMAGETYPE_GIF) || ($info[2] == IMAGETYPE_PNG) ) {
$transparency = imagecolortransparent($image);
$palletsize = imagecolorstotal($image);
if ($transparency >= 0 && $transparency < $palletsize) {
$transparent_color = imagecolorsforindex($image, $transparency);
$transparency = imagecolorallocate($image_resized, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
imagefill($image_resized, 0, 0, $transparency);
imagecolortransparent($image_resized, $transparency);
}
elseif ($info[2] == IMAGETYPE_PNG) {
imagealphablending($image_resized, false);
$color = imagecolorallocatealpha($image_resized, 0, 0, 0, 127);
imagefill($image_resized, 0, 0, $color);
imagesavealpha($image_resized, true);
}
}
imagecopyresampled($image_resized, $image, 0, 0, $cropWidth, $cropHeight, $final_width, $final_height, $width_old - 2 * $cropWidth, $height_old - 2 * $cropHeight);
# Taking care of original, if needed
if ( $delete_original ) {
if ( $use_linux_commands ) exec('rm '.$file);
else @unlink($file);
}
# Preparing a method of providing result
switch ( strtolower($output) ) {
case 'browser':
$mime = image_type_to_mime_type($info[2]);
header("Content-type: $mime");
$output = NULL;
break;
case 'file':
$output = $file;
break;
case 'return':
return $image_resized;
break;
default:
break;
}
# Writing image according to type to the output destination and image quality
switch ( $info[2] ) {
case IMAGETYPE_GIF: imagegif($image_resized, $output); break;
case IMAGETYPE_JPEG: imagejpeg($image_resized, $output, $quality); break;
case IMAGETYPE_PNG:
$quality = 9 - (int)((0.9*$quality)/10.0);
imagepng($image_resized, $output, $quality);
break;
default: return false;
}
return true;
}