你能用PHP中的字符串引用var吗？ [重复]

Question

This question already has an answer here:

• Using braces with dynamic variable names in PHP 8 answers

What I mean is can I do something like this...

$number = 1;
$varname = 'number';

Now I want to get the value of $number by using $varname so something like...

echo $($varname);

Output:

1

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Answer 1

You need to use {} instead of ():

echo ${$varname};

Or even shorter:

echo $$varname;

Which equals:

echo ${'number'};

But as kingkero pointed out: You probably want to do something like ${'number'.$index} and that is easier solved with arrays.