不要在PHP中获取glob函数

Question

http://php.net/glob

The documentation page on glob() has this example:

<?php
foreach (glob("*.txt") as $filename) {
    echo "$filename size " . filesize($filename) . "
";
}
?>

But to be honest, I don't understand how this can work.

The array produced by glob("*.txt") will be traversed, but where does this array come from? Is glob() reading a directory? I don't see that anywhere in the code. Glob() looks for all matches to *.txt

But where do you set where the glob() function should look for these strings?

Answer 1

Without any directory specified glob() would act on the current working directory (often the same directory as the script, but not always).

To make it more useful, use a full path such as glob("/var/log/*.log"). Admittedly the PHP documentation doesn't make the behaviour clear, but glob() is a C library function, which is where it originates from.