readdir
(PHP 4, PHP 5)
readdir — Read entry from directory handle
Popis
Returns the filename of the next file from the directory. The filenames are returned in the order in which they are stored by the filesystem.
Vrátené hodnoty
Returns the filename on success, or FALSE on failure.
Táto funkcia môže vrátiť Boolean FALSE, ale môže tiež vrátiť ne-Booleanovskú hodnotu, ktorá sa vyhodnotí ako FALSE, ako je 0 alebo "". Prosím, prečítajte si sekciu o Booleanoch pre viac informácií. Používajte operátor === pre testovanie vrátenej hodnoty tejto funkcie.
Príklady
Example#1 List all files in a directory
Please note the fashion in which readdir()'s return value is checked in the examples below. We are explicitly testing whether the return value is identical to (equal to and of the same type as--see Comparison Operators for more information) FALSE since otherwise, any directory entry whose name evaluates to FALSE will stop the loop (e.g. a directory named "0").
<?php
// Note that !== did not exist until 4.0.0-RC2
if ($handle = opendir('/path/to/files')) {
echo "Directory handle: $handle\n";
echo "Files:\n";
/* This is the correct way to loop over the directory. */
while (false !== ($file = readdir($handle))) {
echo "$file\n";
}
/* This is the WRONG way to loop over the directory. */
while ($file = readdir($handle)) {
echo "$file\n";
}
closedir($handle);
}
?>
Example#2 List all files in the current directory and strip out . and ..
<?php
if ($handle = opendir('.')) {
while (false !== ($file = readdir($handle))) {
if ($file != "." && $file != "..") {
echo "$file\n";
}
}
closedir($handle);
}
?>