PHP4实际应用经验篇(5)
PHP还给你提供了一种处理多种可能的方式-"if-elseif-else"结构。一个典型的"if-elseif-else"结构语句将如下所示:
--------------------------------------------------------------------------------
if (第一个条件正确)
{
do this!
}
elseif (第二个条件正确)
{
do this!
}
elseif (第三个条件正确)
{
do this!
}
... 等等 ...
else
{
do this!
}
--------------------------------------------------------------------------------
这儿有一个说明如何使用的例子:
--------------------------------------------------------------------------------
td {font-family: Arial;}
令人惊奇的幸运甜饼生产程序
请选择日期
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
--------------------------------------------------------------------------------
你将看到,这个简单的表单允许你选择一周的一天。真正的处理工作由提交后的 PHP 脚本 "cookie.php"来做。
--------------------------------------------------------------------------------
if ($day == "Monday")
{
$fortune = "当能找到使每件事做的复杂精彩的方法的时候,不要使它简单有效.";
}
elseif ($day == "Tuesday")
{
$fortune = "生活是游戏的桥梁?-你一定施展某种巧计了。";
}
elseif ($day == "Wednesday")
{
$fortune = "什么能使头脑清醒的人生活在这个世界上永不发疯?";
}
elseif ($day == "Thursday")
{
$fortune = "不要疯狂,要有趣";
}
elseif ($day == "Friday")
{
$fortune = "仅仅跟着时代走,顺着风气行,当你得到提升时你会发现类型是个魔鬼。";
}
else
{
$fortune = "很抱歉,周末关门";
}
?>
这是你的幸运语:
--------------------------------------------------------------------------------
在这种情况中,我们使用控制句给每天分配不同的幸运语。
这里有一个重要的值得注意的一点-当结构中的一个"if" 语句被发现是真值时,PHP将执行相应的代码,忽略剩下的结构中的"if"语句,立即跳出 "if-elseif-else" 结构,执行整个结构后面的行。

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Usage and precautions of the elseif keyword in PHP In PHP programming, elseif is a very useful keyword for adding more branches to conditional judgments. This article will introduce the usage and precautions of the elseif keyword in detail. Syntax and usage: The elseif statement is used to add a new branch to the conditional judgment, which makes a judgment when the condition in the if statement is not met. Its basic syntax is as follows: if(condition1){//Execute code block
