function pleac_Doing_Something_with_Every_Element_in_a_List()
{
foreach ($list as $item) {
// do something with $item
}
// Environment listing example
// PHP defines a superglobal $_ENV to provide access to environment
// variables.
// Beware, array assignment means copying in PHP. You need to use
// the reference operator to avoid copying. But we want a copy here.
$env = $_ENV;
// PHP can sort an array by key, so you don't need to get keys,
// and then sort.
ksort($env);
foreach ($env as $key => $value) {
echo "{$key}={$value}\n";
}
// Literal translation of Perl example would be:
$keys = array_keys($_ENV);
sort($keys);
foreach ($keys as $key) {
echo "{$key}={$_ENV[$key]}\n";
}
// This assumes that MAX_QUOTA is a named constant.
foreach ($all_users as $user) {
$disk_space = get_usage($user);
if ($disk_space > MAX_QUOTA) {
complain($user);
}
}
// You can't modify array's elements in-place.
$array = array(1, 2, 3);
$newarray = array();
foreach ($array as $item) {
$newarray[] = $item - 1;
}
print_r($newarray);
// Before PHP 5, that is. You can precede the reference operator
// before $item to get reference instead of copy.
$array = array(1, 2, 3);
foreach ($array as &$item) {
$item--;
}
print_r($array);
// TODO: explain the old each() and list() iteration construct.
// foreach is new in PHP 4, and there are subtle differences.
}
/**
* Feel free to add more rules. This one is provided as an example.
*/
protected function enforceRequired($value)
{
if ($value == null) {
complain("is a required value");
}
}
