这个问题在这里已有答案:
我有一个2d数组,其中一部分看起来像这样($ arr是主数组):
$arr = array(
array("id" => "61","name" => "Алла","surname" => "Сарычева","patronymic" => "Игоревна","math" => "45","russian" => "69","informatics" => "56",),
array("id" => "63","name" => "Элина","surname" => "Ахильгова","patronymic" => "Алисхановна","math" => "33","russian" => "73","informatics" => "52")
)
主阵列中有大约500个子阵列,我只想输出它们的$n
数量。我想知道for循环是否是这个问题的最佳决策,或者有一些奇怪的array_map
操作或类似的东西允许比使用for循环更快地执行任务。
非常感谢大家的帮助。