PHP 连接变量
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PHP concatenate variable
提问by FlyingCat
Might be an easy question for you guys. can't find it on google.
对你们来说可能是一个简单的问题。在谷歌上找不到它。
I am trying to concatenate two variables name;
我正在尝试连接两个变量名称；
$i=0;
for ($i=0;$i<5;$i++){
if($array[$i]>0){
$test.$i=//do something
}else{
$test.$i=//do something
}
}
//echo $test0 gives me nothing.
//echo $test1 gives me nothing.
I know I can't use $test.$i but don't know how to do this.Any helps? Thanks!
我知道我不能使用 $test.$i 但不知道该怎么做。有帮助吗？谢谢！
回答by Simon
try ${$test.$i} = value
尝试 ${$test.$i} = value
EDIT: http://php.net/manual/en/language.variables.variable.php
编辑：http: //php.net/manual/en/language.variables.variable.php
回答by Simon
I'm assuming that the variables are called $test0, $test1, ..., $test5. You can use the following:
我假设变量被称为 $test0、$test1、...、$test5。您可以使用以下内容：
${"test".$i}
Though, might I suggest that you make $test an array and use $i as the index instead? It's very odd to use $i as an index to loop through a list of variable names.
不过，我可以建议您将 $test 设为数组并使用 $i 作为索引吗？使用 $i 作为索引来遍历变量名列表是很奇怪的。
As an example, instead of:
举个例子，而不是：
$test0 = "hello";
$test1 = "world";
Use:
用：
$test[0] = "hello";
$test[1] = "world";
回答by nc3b
Try this:
尝试这个：
for ($i=0;$i<5;$i++){
$the_test = $test.$i;
if($array[$i]>0){
$$the_test=//do something
}
else{
$$the_test=//do something
}
}
回答by VDVLeon
This might work:
这可能有效：
$varName = $test . $i;
$$varName = ...
Can i ask where for this is neccesary?
我能问一下这是必要的吗？
