我有这个数组：

Array (

[0] => Array ( [0] => b [1] => d [2] => c [3] =>a [4] => )

[1] => Array ( [0] => c [1] => a [2] => d [3] => [4] => )

[2] => Array ( [0] => b [1] => d [2] => a [3] => [4] => )

[3] => Array ( [0] => a [1] => d [2] => c [3] =>b [4] => )

)

并且想要对每个内部数组的第一个元素中的唯一值执行计数.在上面的例子中,一个有b中的2个,c中的1个和a中的1个.

我测试了这个：

$count = 0;

foreach ($the_outer_array as $key=>$value) {

if ($value [0] == 'c') {

$count++;

}

}

但我一次只能检查一个值.想知道是否有一个外循环,“foreach(范围(‘a’,’d’)为$i)”？计数完成后,我希望将值存储在一个数组中(即找到的字母和实例数).

循环遍历内循环中第一个元素的唯一值的任何建议？再一次谢谢你！