PHP 检查文件是否存在，但不知道扩展名
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PHP check file exists without knowing the extension
提问by Lee
I need to check if a file exists but I don't know the extension.
我需要检查文件是否存在，但我不知道扩展名。
IE I would like to do:
IE 我想做：
if(file_exists('./uploads/filename')):
// do something
endif;
Of course that wont work as it has no extension. the extension will be either jpg, jpeg, png, gif
当然这行不通，因为它没有扩展名。扩展名将是 jpg、jpeg、png、gif
Any ideas of a way of doing this without doing a loop ?
任何不做循环的方法的想法？
回答by Pekka
回答by Ioan Chiriac
I've got the same need, and tried to use glob but this function seems to not be portable :
我有同样的需求，并尝试使用 glob 但此功能似乎不可移植：
See notes from http://php.net/manual/en/function.glob.php:
请参阅http://php.net/manual/en/function.glob.php 中的注释：
Note: This function isn't available on some systems (e.g. old Sun OS).
Note: The GLOB_BRACE flag is not available on some non GNU systems, like Solaris.
注意：此功能在某些系统上不可用（例如旧的 Sun 操作系统）。
注意： GLOB_BRACE 标志在某些非 GNU 系统上不可用，例如 Solaris。
It also more slower than opendir, take a look at : Which is faster: glob() or opendir()
它也比 opendir 慢，看看：哪个更快：glob() 或 opendir()
So I've made a snippet function that does the same thing :
因此，我制作了一个执行相同操作的代码段函数：
function resolve($name) {
// reads informations over the path
$info = pathinfo($name);
if (!empty($info['extension'])) {
// if the file already contains an extension returns it
return $name;
}
$filename = $info['filename'];
$len = strlen($filename);
// open the folder
$dh = opendir($info['dirname']);
if (!$dh) {
return false;
}
// scan each file in the folder
while (($file = readdir($dh)) !== false) {
if (strncmp($file, $filename, $len) === 0) {
if (strlen($name) > $len) {
// if name contains a directory part
$name = substr($name, 0, strlen($name) - $len) . $file;
} else {
// if the name is at the path root
$name = $file;
}
closedir($dh);
return $name;
}
}
// file not found
closedir($dh);
return false;
}
Usage :
用法 ：
$file = resolve('/var/www/my-website/index');
echo $file; // will output /var/www/my-website/index.html (for example)
Hope that could helps someone, Ioan
希望可以帮助某人，Ioan
回答by gearsdigital
Did you know about the PHP filetype function? http://php.net/manual/en/function.filetype.php
你知道 PHP 文件类型函数吗？ http://php.net/manual/en/function.filetype.php
Or otherwise is_file()http://www.php.net/manual/en/function.is-file.php
或者以其他方式is_file()http://www.php.net/manual/en/function.is-file.php
