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我有一个代码块,只要扩展名为小写jpg,就可以上传图像并创建缩略图,但如果图像是大写的JPG,则不会上传图像.当我重命名图像时,例如example.JPG到example.jpg,它会上传.但是example.JPG不会上传,我没有错误.这对我没有任何意义.有没有人对此有解释？这是我的代码：

function createThumbnail($filename) {

require 'config.php';

if(preg_match('/[.](jpg)$/', $filename)) {

$im = imagecreatefromjpeg($filename.$path_to_image_directory);

} 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 = $final_height_of_image;

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

imagecopyresampled($nm, $im, 0,0,0,0,$nx,$ny,$ox,$oy);

if(!file_exists($path_to_thumbs_directory)) {

if(!mkdir($path_to_thumbs_directory)) {

die("There was a problem. Please try again!");

}

}

imagejpeg($nm, $path_to_thumbs_directory . $filename);

$tn = '';

$tn .= '
Congratulations. Your file has been successfully uploaded, and a thumbnail has been created.';

echo $tn;

}

?>

配置文件：

$final_width_of_image = 300;

$final_height_of_image = 300;

$path_to_image_directory = '';

$path_to_thumbs_directory = '-tn';

?>