根据其他变量值和静态文本构造一个PHP变量名称 [英] Construct a PHP variable name based on other variable values and static text

问题描述

我想告诉我的函数根据星期几来调用哪个变量.星期几存储在$ s_day中，我要调用的变量根据它是哪一天而改变.

I want to tell my function which variable to call based on the day of the week. The day of the week is stored in $s_day, and the variables I want to call changes based on which day it is.

例如

我在$ d_monday_text1中存储了一个字符串"Welcome to the week".除了建立7条条件语句的集合(例如，如果date = monday echo $ foo，否则如果date = tuesday echo $ bar ...)，我可以通过串联函数名来更改函数中调用的变量的名称吗?变量?

I've stored a string 'Welcome to the week' in $d_monday_text1. Rather than build a set of 7 conditional statements (e.g. if date=monday echo $foo, else if date=tuesday echo $bar...), can I change the name of the variable called in the function by concatenating the name of the variable?

$s_day = date("l");
$text1 = '$d_'.$s_day.'_text1';

我希望它的计算结果为$ d_monday_text1，如上所述，其值为"Welcome to the week".因此，稍后我想使用:

I'm hoping this evaluates to $d_monday_text1, which, as mentioned above, has the value "Welcome to the week". So, later on I'd want to use:

echo $text1;

要产生结果输出=欢迎来到本周.

To yield the resulting output = Welcome to the week.

我研究了变量变量，这也许是解决问题的方法，但是在语法上却很挣扎.我可以得到它来呼应串联的名称，但是我不知道如何评估该名称.

I've looked into variable variables, which may be the way to go here, but am struggling with syntax. I can get it to echo the concatenated name, but I can't figure out how to get that name evaluated.

推荐答案

变量不是一个好主意-您应该使用数组.他们非常好地解决了这个问题.

Variable variables aren't a good idea - You should rather use arrays. They suit this problem much, much better.

例如，您可以使用以下内容:

For example, you could use something like this:

$messages = array(
    'monday' => 'Welcome to the week',
    'tuesday' => 'Blah blah',
    'wednesday' => 'wed',
    'thursday' => 'thu',
    'friday' => 'fri',
    'saturday' => 'sat',
    'sunday' => 'week is over!'
);

$dayName = date('l');
echo $messages[$dayName];

数组是 数据格式，用于存储诸如此类的多个相关值.

Arrays are the data format used to store multiple related values such as these.

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