php如何让数组倒叙（3种方法）

array array_reverse ( array $array , bool $preserve_keys = FALSE )

$arr = array('a', 'b', 'c', 'd');$reverse = array_reverse($arr);print_r($reverse);

Array(    [0] => d    [1] => c    [2] => b    [3] => a)

$arr = array(    array('a', 'b', 'c'),    array('d', 'e', 'f'),    array('g', 'h', 'i'));$reverse = array_reverse(array_map('array_reverse', $arr));print_r($reverse);

Array(    [0] => Array        (            [0] => i            [1] => h            [2] => g        )    [1] => Array        (            [0] => f            [1] => e            [2] => d        )    [2] => Array        (            [0] => c            [1] => b            [2] => a        ))

$arr = array(    "a" => "apple",    "b" => "banana",    "c" => "cat");krsort($arr);print_r($arr);

Array(    [c] => cat    [b] => banana    [a] => apple)