php变量与数组相互转换的方法(extract与compact)

<?php
  //多个变量转数组
  $name='jb51';
  $email='jb51@uoften.com';
  $info=compact('name','email');//传递变量名
  print_r($info);
  /*
  Array
  (
    [name] => jb51
    [email] => jb51@uoften.com
  )
  */
?>

<?php
//数组转多个变量
  $capitalcities['England'] = 'London';
  $capitalcities['Scotland'] = 'Edinburgh';
  $capitalcities['Wales'] = 'Cardiff';
  extract($capitalcities);//转变成三个变量 England，Scotland，Wales
  print $Wales;//Cardiff
?>

<?php
$my_array = array("a" => "Cat","b" => "Dog", "c" => "Horse");
extract($my_array);
echo "$a = $a; $b = $b; $c = $c";
?>

$a = Cat; $b = Dog; $c = Horse