dsdfd2322 2013-05-28 20:17
浏览 150
已采纳

在IF语句中,在发现一个为真之后,条件检查是否继续(PHP)

For IF statements using OR or similar operators, after one is found to be true, does PHP continue checking the rest or does it stop there? For example.

if(true == true OR a_checking_function())

Would both be checked, or would PHP just check one?

  • 写回答

2条回答 默认 最新

  • duanhao1004 2013-05-28 20:18
    关注

    No, as soon as the first true is found, it goes straight to the code in the braces. If you used an 'AND' keyword, then it would check the second condition.

    You may want to look at operator / logic precedence. For example, what would happen for the following conditions?:

    if($a = $b AND $c = $d AND $e = $f)...
    if($a = $b AND $c = $d OR $e = $f)...
    if($a = $b OR $c = $d AND $e = $f)...
    

    http://php.net/manual/en/language.operators.precedence.php

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(1条)

报告相同问题?

悬赏问题

  • ¥15 关于#python#的问题
  • ¥20 oracle RAC 怎么配置啊,配置
  • ¥15 excel 日常使用中出现问题
  • ¥20 pdusession建立失败
  • ¥15 为什么mqtt接收不到数据?
  • ¥15 思科校园网的组建,sos!
  • ¥15 主要进行描述非满管状态下,管路的摩阻系数是怎么变化的,在管路长度方向上是怎么分布的(标签-matlab)
  • ¥15 multisim设计求解如图
  • ¥15 动态多目标优化,求解定义的问题的POF和POS公式
  • ¥30 实验 :UML2.0 行为建模