PHP 使用PHP快速创建图像缩略图

Posted 2021-05-14

function createThumbnail($path_to_image_directory, $path_to_thumbs_directory, $filename, $final_width_of_image) {

	if(preg_match('/[.](jpg)$/', $filename)) {
		$im = imagecreatefromjpeg($path_to_image_directory . $filename);
	} else if (preg_match('/[.](gif)$/', $filename)) {
		$im = imagecreatefromgif($path_to_image_directory . $filename);
	} else if (preg_match('/[.](png)$/', $filename)) {
		$im = imagecreatefrompng($path_to_image_directory . $filename);
	}

	$ox = imagesx($im);
	$oy = imagesy($im);

	$nx = $final_width_of_image;
	$ny = floor($oy * ($final_width_of_image / $ox));

	$nm = imagecreatetruecolor($nx, $ny);

	imagecopyresized($nm, $im, 0,0,0,0,$nx,$ny,$ox,$oy);
	imagejpeg($nm, $path_to_thumbs_directory . $filename);
}