// Array as (property-)map
$map = array( "version"    => 4
            , "OS"         => "Linux"
            , "lang"       => "english"
            , "short_tags" => true
            );
            
// strictly numerical keys
$array = array( 7
              , 8
              , 0
              , 156
              , -10
              );
// this is the same as array( 0 => 7, 1 => 8, ...)

$switching = array(         10 // key = 0
                  , 5    =>  6
                  , 3    =>  7 
                  , "a"  =>  4
                  ,         11 // key = 6 (maximum of integer-indices was 5)
                  , "8"  =>  2 // key = 8 (integer!)
                  , "02" => 77 // key = "02"
                  , 0    => 12 // the value 10 will be overwritten by 12
                  );
                  
<!-- TODO example of
- mixed keys
- overwriting keys
- integer keys as string
- using vars/functions as key/values
- mixed skipping
-->

// empty array
$empty = array(); 
数据挖掘研究院
 

$colors = array("red","blue","green","yellow");

foreach ( $colors as $color ) {
    echo "Do you like $color?
";
}

/* output:
Do you like red?
Do you like blue?
Do you like green?
Do you like yellow?
*/ 
数据挖掘实验室
 

foreach ( $colors as $key => $color ) {
    // won"t work:
    //$color = strtoupper($color);
    
    //works:
    $colors[$key] = strtoupper($color);
}
print_r($colors);

/* output:
Array
(
    [0] => RED
    [1] => BLUE
    [2] => GREEN
    [3] => YELLOW
)
*/ 
数据挖掘研究院
 

$firstquarter  = array(1 => "January", "February", "March");
print_r($firstquarter);

/* output:
Array 
(
    [1] => "January"
    [2] => "February"
    [3] => "March"
)
*/ 
数据挖掘研究院
 

// fill an array with all items from a directory
$handle = opendir(".");
while ($file = readdir($handle)) 
{
    $files[] = $file;
}
closedir($handle); 数据挖掘研究院 

sort($files);
print_r($files); 数据挖掘研究院 

$fruits = array ( "fruits"  => array ( "a" => "orange"
                                     , "b" => "banana"
                                     , "c" => "apple"
                                     )
                , "numbers" => array ( 1
                                     , 2
                                     , 3
                                     , 4
                                     , 5
                                     , 6
                                     )
                , "holes"   => array (      "first"
                                     , 5 => "second"
                                     ,      "third"
                                     )
                ); 数据挖掘研究院