如何在PHP中从多个变量创建一个变量？ [关闭]

Lets say we have variables: $page and $id. For example, $id=2. I wanna create new variable from existing variables $page and $id: $page2. how to do it? is it possible??

You can use curly brackets notation to create your variable name : http://codepad.org/L6B5vYdG

 <?php        
       $number = 2;        
       ${'page' . $number} = 20 ;        
       var_dump($page2);        
  ?>

$page = 2;
${"page".$page} = "5555"; //we'll create variable from page + variable $page (2)
//$page2 has been created
$id = intval($page2); //$id will be 5555

You can simply concatenate them, or use the a string formatter such as sprintf

<?php

$page2 = $page . $id
# or
$page2 = snprintf("%s-%d", $page, $id);

You are asking for variable variables:

$page = 'x';
$id   = 2;

${$page . $id} = 'lol'; // variable is named `$x2`

Or, simpler (I can't quite tell from your question):

$id   = 2;

${'page' . $id} = 'lol'; // variable is named `$page2`

However, this is almost always a bad idea. Prefer arrays and/or objects.