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Homephp教程php手册PHP匿名函数和use子句用法实例,匿名use子句实例

PHP匿名函数和use子句用法实例,匿名use子句实例

本文实例讲述了PHP匿名函数和use子句用法。分享给大家供大家参考,具体如下:

下面方法输出的是hello world

$param1和$param2是闭包变量

function test()
{
  $param2 = 'every';
  // 返回一个匿名函数
  return function ($param1) use ($param2) {
    // use子句 让匿名函数使用其作用域的变量
    $param2 .= 'one';
    print $param1 . ' ' . $param2;
  };
}
$anonymous_func = test();
$anonymous_func('hello');

下面的方式 输出hello everyone

function test()
{
  $param2 = 'everyone';
  $func = function ($param1) use ($param2) {
    // use子句 让匿名函数使用其父作用域的变量
    print $param1 . ' ' . $param2;
  };
  $param2 = 'everybody';
  return $func;
}
$anonymous_func = test();
$anonymous_func('hello');

下面的方式 输出hello everybody

$param2中多了一个引用

function test()
{
  $param2 = 'everyone';
  $func = function ($param1) use (&$param2) {
    // use子句 让匿名函数使用其父作用域的变量
    print $param1 . ' ' . $param2;
  };
  $param2 = 'everybody';
  return $func;
}
$anonymous_func = test();
$anonymous_func('hello');

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