PHP verifies whether username and password are empty

php verifies whether the username and password are empty

Many times, our front-end js performs a check on the username and password For non-null verification, the backend needs to verify it again, so as to ensure the security of the data and the robustness of the code logic.

php method to verify that the username and password are empty, the code is as follows:

if (!isset($_POST['username']) || !isset($_POST['password'])) {
  die('缺少用户名密码');
}
if (empty($_POST['username']) || empty($_POST['password'])) {
  die('用户名或密码为空');
}
// 正常逻辑

isset and empty

When judging whether a variable has been declared, you can use the isset function

To determine whether a variable has been assigned data and is not empty, you can use the empty function

To determine if a variable exists and is not empty, first use the isset function, and then use the empty function

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