如下面例子:

$foo[1]['a']['xx'] = 'bar 1';
$foo[1]['b']['xx'] = 'bar 2';
$foo[2]['a']['bb'] = 'bar 3';
$foo[2]['a']['yy'] = 'bar 4';
$foo[3]['c']['dd'] = 'bar 3';
$foo[3]['f']['gg'] = 'bar 3';
$foo['info'][1] = 'bar 5';

如果要查找 bar 3 怎么進行查找呢。有三個結果，而這三個結果都要，看下面的函數：
-------------------------------------------------------------------------------------------------------------------------------
function array_search_re($needle, $haystack, $a=0, $nodes_temp=array()){
global $nodes_found;
$a++;
foreach ($haystack as $key1=>$value1) {
??? $nodes_temp[$a] = $key1;
??? if (is_array($value1)){???
????? array_search_re($needle, $value1, $a, $nodes_temp);
??? }
??? else if ($value1 === $needle){
????? $nodes_found[] = $nodes_temp;
??? }
}
return $nodes_found;
}
---------------------------------------------------------------------------------------------------------------------------------
這個函數就可以把上面要查找到的內容全部返回出鍵名來
$result = array_search_re('bar 3', $foo);

print_r($result);

輸出結果為如下：
Array ( [0] => Array ( [1] => 2 [2] => a [3] => bb )
?????? ?? [1] => Array ( [1] => 3 [2] => c [3] => dd )
?????? ?? [2] => Array ( [1] => 3 [2] => f [3] => gg )
???? ?? )

1 php搜索多維數組的鍵名

function array_search_key($needle, $haystack){
global $nodes_found;

foreach ($haystack as $key1=>$value1) {
?
?if ($key1=== $needle){
?
??$nodes_found[] = $value1;
???????
?? }
??? if (is_array($value1)){???
????? array_search_key($needle, $value1);
??? }
???
???
}

return $nodes_found;
}
$result = array_search_key('a', $foo);

print_r($result);

輸出結果為如下：
?

Array
(
??? [0] => Array
??????? (
??????????? [xx] => bar 1
??????? )

??? [1] => Array
??????? (
??????????? [bb] => bar 3
??????? )

??? [2] => Array
??????? (
??????????? [yy] => bar 4
??????? )

)

JS判斷一個變量是否是數組的方法

1. function isArray(o) {
2. return Object.prototype.toString.call(o) === '[object Array]';
3. }

//for in循環數組

1. var key;
2. for (key in array)
3. {
4. }

//for循環數組

1. var key;
2. for (key =0;key< url.length;key++)
3. {
4. }

有時我們要把一個全為空字符串組成的數組如：array('','','');當成是空對待，因為里面不含任何數據

使用empty()顯然是不行的，因為里面包含了三個值，只是這些值都是空字符串，用count()也不可以

那么可以用一種變通的方式，先把數組用implode轉換成字符串，再判斷字符串是否為真就可以了：

$a=array('','');

$a = implode('',$a);i

f($a)'為真';

else echo '為假';