$.post使用時のPHP側での受け取り方(ao形式)

sample.js

var postData = [];
$('.sample').each(function() {
    var record = {};
    record.column1 = 'aaa';
    record.column2 = 'bbb';
    record.column3 = [1,2];
    postData.push(record);
});

$.post(
    '/post/sample',
    {postData: postData},
    function(data) {
        // 何か処理
    }
);

PHP側での持ち方

array(2) {
    [0]=>
    array(3) {
        ["column1"]=>
        string(1) "aaa"
        ["column2"]=>
        string(1) "bbb"
        ["column3"]=>
        array(2) {
            [0]=>
            string(1) "1"
            [1]=>
            string(2) "2"
        }
    }
    [1]=>
    array(3) {
        ["column1"]=>
        string(1) "aaa"
        ["column2"]=>
        string(1) "bbb"
        ["column3"]=>
        array(2) {
            [0]=>
            string(1) "1"
            [1]=>
            string(2) "2"
        }
    }
}