PHP基础之数组

＜?php
// fill an array with all items from a directory
$handle = opendir('.');
while (false !== ($file = readdir($handle))) {
   $files[] = $file;
}
closedir($handle);
?＞

＜?php
sort($files);
print_r($files);
?＞ 

 array ( "a" => "orange",
                                       "b" => "banana",
                                       "c" => "apple"
                                     ),
                 "numbers" => array ( 1,
                                       2,
                                       3,
                                       4,
                                       5,
                                       6
                                     ),
                 "holes"  => array (      "first",
                                       5 => "second",
                                           "third"
                                     )
               );

// Some examples to address values in the array above
echo $fruits["holes"][5];    // prints "second"
echo $fruits["fruits"]["a"]; // prints "orange"
unset($fruits["holes"][0]);  // remove "first"

// Create a new multi-dimensional array
$juices["apple"]["green"] = "good";
?> 

＜?php
$arr1 = array(2, 3);
$arr2 = $arr1;
$arr2[] = 4; // $arr2 is changed,
             // $arr1 is still array(2,3)

$arr3 = &$arr1;
$arr3[] = 4; // now $arr1 and $arr3 are the same
?＞