如何将 $variable 放入数组

Question

您好，这是我想将变量放入数组的代码

    class NewTest extends BaseExample {
  public function render() {
    $startDate = $this->getNow();
    $endDate = $this->getNow();
    $optParams = array(
      'metric' => array('EARNINGS'),
      'useTimezoneReporting' => true,
      'filter' => 'DOMAIN_NAME==' .$sub. ',      
    );

我尝试过' .$sub.' 和 $sub 但它不起作用

Answer 1

轻微的语法错误 - 只需删除最后的 . '

class NewTest extends BaseExample {
  public function render() {
   $startDate = $this->getNow();
   $endDate = $this->getNow();
   $optParams = array(
    'metric' => array('EARNINGS'),
    'useTimezoneReporting' => true,
    'filter' => 'DOMAIN_NAME==' . $sub,      
   );
 }
}

Answer 2

缺少'

'filter' => 'DOMAIN_NAME==' .$sub. '', 

既然没用，应该更好

'filter' => 'DOMAIN_NAME==' .$sub, 

Answer 3

去掉'

    class NewTest extends BaseExample {
  public function render() {
    $startDate = $this->getNow();
    $endDate = $this->getNow();
    $optParams = array(
      'metric' => array('EARNINGS'),
      'useTimezoneReporting' => true,
      'filter' => 'DOMAIN_NAME==' .$sub,      
    );