你即將離開本站

並前往https://www.php.net/manual/en/function.is-null.php

is_null - Manual - PHP

Returns true if value is null, false otherwise. ... A quick test in 2022 on PHP 8.1 confirms there is still no need to micro-optimize NULL checks: <?php

確定！ 回上一頁

查詢 「Null check」的人也找了：

  1. JavaScript check not null
    2.
  2. JavaScript check null or undefined
    3.
  3. JavaScript is null or empty
    4.
  4. JS null object check
    5.
  5. JS default value if null
    6.
  6. Number null
    7.
  7. Html if null
    8.
  8. JavaScript return null
    9.