function smart_resize_image( $file, $width = 0, $height = 0, $proportional = false, $output = 'file', $delete_original = true, $use_linux_commands = false ){ if ( $height return false; } $info = getimagesize($file); $image = ''; $final_width = 0; $final_height = 0; list($width_old, $height_old) = $info; if ($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 $final_height = ( $height } switch ($info[2] ) { case imagetype_gif: $image = imagecreatefromgif($file); break; case imagetype_jpeg: $image = imagecreatefromjpeg($file); break; case imagetype_png: $image = imagecreatefrompng($file); break; default: return false; } $image_resized = imagecreatetruecolor( $final_width, $final_height ); if ( ($info[2] == imagetype_gif) || ($info[2] == imagetype_png) ) { $trnprt_indx = imagecolortransparent($image); // if we have a specific transparent color if ($trnprt_indx >= 0) { // get the original image's transparent color's rgb values $trnprt_color = imagecolorsforindex($image, $trnprt_indx); // allocate the same color in the new image resource $trnprt_indx = imagecolorallocate($image_resized, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']); // completely fill the background of the new image with allocated color. imagefill($image_resized, 0, 0, $trnprt_indx); // set the background color for new image to transparent imagecolortransparent($image_resized, $trnprt_indx); } // always make a transparent background color for pngs that don't have one allocated already elseif ($info[2] == imagetype_png) { // turn off transparency blending (temporarily) imagealphablending($image_resized, false); // create a new transparent color for image $color = imagecolorallocatealpha($image_resized, 0, 0, 0, 127); // completely fill the background of the new image with allocated color. imagefill($image_resized, 0, 0, $color); // restore transparency blending imagesavealpha($image_resized, true); } } imagecopyresampled($image_resized, $image, 0, 0, 0, 0, $final_width, $final_height, $width_old, $height_old); if ( $delete_original ) { if ( $use_linux_commands ) exec('rm '.$file); else @unlink($file); } switch ( strtolower($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 $image_resized; break; default: break; } switch ($info[2] ) { case imagetype_gif: imagegif($image_resized, $output); break; case imagetype_jpeg: imagejpeg($image_resized, $output); break; case imagetype_png: imagepng($image_resized, $output); break; default: return false; } return true;}
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php, png