php 去除后缀

function removeExtension($filename) {
    $dotPosition = strrpos($filename, '.');
    if ($dotPosition === false) {
        return $filename;
    }
    return substr($filename, 0, $dotPosition);
}

$filename = "example.txt";
$newFilename = removeExtension($filename);
echo $newFilename; // 输出: example

function removeExtension($filename) {
    return preg_replace('/\.[^.]+$/', '', $filename);
}

$filename = "example.txt";
$newFilename = removeExtension($filename);
echo $newFilename; // 输出: example

function removeExtension($filename) {
    $parts = explode('.', $filename);
    return array_shift($parts);
}

$filename = "example.sub.txt";
$newFilename = removeExtension($filename);
echo $newFilename; // 输出: example

function removeExtension($filename) {
    $dotPosition = strrpos($filename, '.');
    if ($dotPosition === false || $dotPosition === 0) {
        return $filename;
    }
    return substr($filename, 0, $dotPosition);
}

$filename = ".hiddenfile";
$newFilename = removeExtension($filename);
echo $newFilename; // 输出: .hiddenfile