如何在变量内插入变量

Question

I Have the php code :

$rand = rand(1,5);

and I want to define var that has the name of the rand function like :

$$rand // if $rand= 1 then the var will be $1

and then do

switch($rand){
case(1):
$$rand = 'How many legs dog has ?';
$ans= '4';      }

The code is for defining security questions. Hope someone got my idea. How can I do it ?

Answer 1

// Sanitize the arrays
$questions = array();
$answers = array();

// Build some questions and assign to the questions array
$questions[0] = 'How many legs does a dog have?';
$questions[1] = 'How many eyes does a human have?';
$questions[2] = 'How many legs does a spider have?';


// Add the answers, making sure the array index is the same as the questions array
$answers[0] = 4;
$answers[1] = 2;
$answers[2] = 8;


// Select a question to use
$questionId = rand(0, count($questions));


// Output the question and answer
echo 'questions: ' . $questions[$questionId];
echo 'answer: ' . $answers[$questionId];

Variables in PHP cannot start with a number.