使用php格式化數據輸出

Question

我有以下功能從數據庫中提取數據：

public function get_dataset() {
        $dataset = "";
        $data_set = $this->operations_model->get_date();
        foreach ($data_set as $value) {
            $dataset .= '["' . $value['date'] . '","' . $value['revenue'] . '"],';
        }

        echo $dataset;
    }

並以以下格式返回數據：

["2015-10-13 15:53:20","15000.00"],["2015-10-13 15:53:20","5800.00"],["2015-10-13 15:53:20","5800.00"],["2015-10-13 15:53:20","5800.00"],["2015-10-13 15:54:56","15000.00"],

我想將上述數據格式化為以下格式：

[[2015-10-13 15:53:20,15000.00],[2015-10-13 15:53:20,5800.00],[2015-10-13 15:53:20,5800.00],[2015-10-13 15:53:20,5800.00],[2015-10-13 15:54:56,15000.00]]

Answer 1

嘗試這個

public function get_dataset() {
    $dataset = "[";
    $data_set = $this->operations_model->get_date();
    foreach ($data_set as $value) {
        $dataset .= '["' . $value['date'] . '","' . $value['revenue'] . '"],';
    }
    $dataset = substr($dataset, 0, -1);
    $dataset .= "]";

    echo $dataset;
}

Answer 2

嘗試：

 public function get_dataset() { $dataset = ""; $comma=''; $data_set = $this->operations_model->get_date(); foreach ($data_set as $value) { $dataset .= $comma.'[' . $value['date'] . ',' . $value['revenue'] . ']'; $comma=','; } echo '['.$dataset.']'; }