分享幾個有意思的陣列方法

$base = array('citrus' => array( "orange") , 'berries' => array("blackberry", "raspberry"), );
$replacements = array('citrus' => array('pineapple'), 'berries' => array('blueberry'));
$basket = array_replace_recursive($base, $replacements);

帶索引檢查計算陣列的交集，用回撥函數比較索引 array_intersect_uassoc

$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "GREEN", "B" => "brown", "yellow", "red");
print_r(array_intersect_uassoc($array1, $array2, "strcasecmp"));

遞回地合併一個或多個陣列 array_merge_recursive

$ar1 = array("color" => array("favorite" => "red"), 5);
$ar2 = array(10, "color" => array("favorite" => "green", "blue"));
$result = array_merge_recursive($ar1, $ar2);

使用傳遞的陣列遞回替換第一個陣列的元素 array_replace_recursive

$base = array('citrus' => array( "orange") , 'berries' => array("blackberry", "raspberry"), );
$replacements = array('citrus' => array('pineapple'), 'berries' => array('blueberry'));
$basket = array_replace_recursive($base, $replacements);
print_r($basket);

將一個線性陣列轉換為一個樹，或者多維陣列

function array_stack (&$a, $p = '@parent', $c = '@children')
    {
      $l = $t = array();
      foreach ($a AS $key => $val):
        if (!$val[$p]) $t[$key] =& $l[$key];
        else $l[$val[$p]][$c][$key] =& $l[$key];
        $l[$key] = (array)$l[$key] + $val;
      endforeach;
      return $a = array('tree' => $t, 'leaf' => $l);
    }
    $node = array();
    $node[1] = array('@parent' => 0, 'title' => 'I am node 1.');
    $node[2] = array('@parent' => 1, 'title' => 'I am node 2.');
    $node[3] = array('@parent' => 2, 'title' => 'I am node 3.');
    $node[4] = array('@parent' => 1, 'title' => 'I am node 4.');
    $node[5] = array('@parent' => 4, 'title' => 'I am node 5.');
    print_r(array_stack($node));

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