Question

这样，我有40条以上的案例陈述，某些条件甚至没有执行，我不知道为什么请回答谢谢

switch (true){
    case (isset($_POST['min_beds']) && !empty($_POST['price_val']) && isset($_POST['property_status']) && $_POST['property_type'] == 'All' && $_POST['my_project_location'] == 'All'): 
    break;
    case (isset($_POST['min_beds']) && !empty($_POST['price_val']) && isset($_POST['my_project_location']) && $_POST['property_type'] == 'All' && $_POST['property_status'] == 'All'): 
    break;
    case (isset($_POST['min_beds']) && !empty($_POST['price_val']) && isset($_POST['property_status']) && $_POST['property_type'] == 'All' && $_POST['my_project_location'] == 'All'):
    break;

    case ($_POST['property_status'] == 'All' && isset($_POST['property_type']) && isset($_POST['my_project_location'])  && isset($_POST['min_beds']) && isset($features) && !empty($_POST['price_val'])): 
    break;
    case (isset($features) && !empty($_POST['price_val']) && isset($_POST['my_project_location']) && $_POST['property_status'] == 'All' && $_POST['property_type'] == 'All' && $_POST['min_beds'] == 'All'): 
    break;
    case ($_POST['property_status'] == 'All' && isset($_POST['my_project_location'])  && isset($_POST['min_beds']) && isset($features) && !empty($_POST['price_val']) && $_POST['property_type'] == 'All'): 
    break;
  }

Answer 1

与一系列elseif相比，Switch更像是if的链。仅将第一个case语句评估为真实的（当非严格比较所打开的值时） ，并且不会检查其他case语句。在匹配的break语句之后到达第一个case后，开关将退出；

请参阅：https://www.php.net/manual/en/control-structures.switch.php

switch(true) {
    case true:
        echo("this will run");
    case false: 
        echo("this will also run because there is no 'break' yet");
        break;
    case true:
        echo("this will never run");
}

Answer 2

您没有正确使用开关。如果您希望在满足这些条件中的任何一个时中断，请使用ifs。

if(isset($_POST['min_beds']) && !empty($_POST['price_val']) && isset($_POST['property_status']) && $_POST['property_type'] == 'All' && $_POST['my_project_location'] == 'All'){
    break;
}
if(isset($_POST['min_beds']) && !empty($_POST['price_val']) && isset($_POST['my_project_location']) && $_POST['property_type'] == 'All' && $_POST['property_status'] == 'All'){ 
    break;
}
if(isset($_POST['min_beds']) && !empty($_POST['price_val']) && isset($_POST['property_status']) && $_POST['property_type'] == 'All' && $_POST['my_project_location'] == 'All'){
    break;
}
if($_POST['property_status'] == 'All' && isset($_POST['property_type']) && isset($_POST['my_project_location'])  && isset($_POST['min_beds']) && isset($features) && !empty($_POST['price_val'])){
    break;
}
if(isset($features) && !empty($_POST['price_val']) && isset($_POST['my_project_location']) && $_POST['property_status'] == 'All' && $_POST['property_type'] == 'All' && $_POST['min_beds'] == 'All'){ 
    break;
}
if($_POST['property_status'] == 'All' && isset($_POST['my_project_location'])  && isset($_POST['min_beds']) && isset($features) && !empty($_POST['price_val']) && $_POST['property_type'] == 'All'){ 
    break;
  }

switch语句大小写未执行

2 个答案: