note 31851 modified in function.key by danbrown
| From: | danbrown@php.net | Date: | Sat, 28 Mar 2009 23:11:52 +0000 |
| Subject: | note 31851 modified in function.key by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-152568@lists.php.net to get a copy of this message | ||
<?php
$tab = array();
$tab[0] = 'php';
$tab[1] = '.';
$tab[2] = 'net';
// you will not enter the while
// $key = 0, while will consider $key as false
reset($tab);
while ($key = key($tab) ) {
echo $tab[$key];
next($tab);
}
// this will
reset($tab);
while (!is_null($key = key($tab) ) ) {
echo $tab[$key];
next($tab);
}
// when key() can't return a 'key', it return NULL
echo var_dump($key);
?>
--was--
$tab = array();
$tab[0] = 'php';
$tab[1] = '.';
$tab[2] = 'net';
// you will not enter the while
// $key = 0, while will consider $key as false
reset($tab);
while ($key = key($tab) ) {
echo $tab[$key];
next($tab);
}
// this will
reset($tab);
while (!is_null($key = key($tab) ) ) {
echo $tab[$key];
next($tab);
}
// when key() can't return a 'key', it return NULL
echo var_dump($key);
http://php.net/manual/en/function.key.php