Question

我们在生产服务器上收到PHP通知：

[PHP Notice] Trying to get property of non-object

在我们的代码中，我们有两个Foo个对象数组，每个对象都有一个pos成员变量：

$locked_foos
$unlocked_foos

我正在运行一个while循环来命令并将这些Foo合并到一个新的数组结果中：

$cur_pos = 1;
$result  = [];

// Extract first locked and unlocked foos
$locked_foo = reset($locked_foos);
$unlocked_foo = reset($unlocked_foos);

// While there is either an unlocked or locked foo..
while($locked_foo || $unlocked_foo){

  // If there is no unlocked (thus must be a locked) or the locked's position is current..
  if(!$unlocked_foo || $locked_foo->pos == $cur_pos){ // **Error**

    // Use locked, set pos and iterate locked
    $locked_foo->pos = $cur_pos;
    $result[] = $locked_foo;

    $locked_foo = next($locked_foos);
  }
  // Else..
  else {

    // Use unlocked, set pos and iterate unlocked
    $unlocked_foo->pos = $cur_pos;
    $result[] = $unlocked_foo;

    $unlocked_foo = next($unlocked_foos);
  }

  // Iterate current position
  $cur_pos++;
}

错误发生在显示的行上。

我认为当$locked_foos中的一个设置为对象以外的其他内容时会发生错误，所以我添加了这些行：

  if($locked_foo && !is_object($locked_foo)){
    throw new Exception('FOOOO!');
  }

就在while循环中。

我仍然得到相同的错误并且没有抛出异常，这怎么可能？

Answer 1

原来我的逻辑很时髦：

// If there is no unlocked (thus must be a locked) or the locked's position is current..
if(!$unlocked_foo || $locked_foo->pos == $cur_pos){ // **Error**

  // Use locked, set pos and iterate locked
  $locked_foo->pos = $cur_pos;
  $result[] = $locked_foo;

  $locked_foo = next($locked_foos);
}

在$locked_foos $unlocked_foos之前$unlocked_foo用尽$locked_foo = false的情况下，if为正// If there is a locked with the current position or there is no unlocked.. if( $locked_foo && ($locked_foo->pos == $cur_pos || !$unlocked_foo) ){ .. }。

我将Condition-1: If experience is more than 10 years, increase salary by 20%. Condition-2: If experience is greater than 5 years, increase salary by 10%. Condition-3: All others will get an increase of 5% in the salary.条件更改为

    DECLARE
     veno  emp.empno%type:=&veno;
     vsal  emp.sal%type;
     vexp  number;
BEGIN
    select empno,sal,trunc(to_char(months_between(sysdate,hiredate)/12))into veno,vsal,vexp from emp where empno=veno;
DBMS_OUTPUT.PUT_LINE('before update:' ||chr(10)||veno||chr(10)||vsal);
    if vexp>=10 then
        update emp set sal=sal+(sal*.20) where empno=veno; 
        select sal into vsal from emp where empno=veno;
        DBMS_OUTPUT.PUT_LINE('after update:' ||chr(10)||vsal);
   elsif vexp>=5 then
        update emp set sal=sal+(sal*.10) where empno=veno;
        select sal into vsal from emp where empno=veno;
        DBMS_OUTPUT.PUT_LINE('after update:' ||chr(10)||vsal);
     else 
        update emp set sal=sal+(sal*.05) where empno=veno;
        select sal into vsal from emp where empno=veno;
        DBMS_OUTPUT.PUT_LINE('after update:' ||chr(10)||vsal);
   end if;
END;
/

这是正确的逻辑（也可能更具可读性）。

间歇性错误'试图获取非对象的属性'

1 个答案: