PHP利用实测class的function中include的文件中非php的global全局环境的简单示例

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测试代码1.php

代码如下:

 
<?php
/*   四海网 www.q1010.com   */
 
$g1 = 'g1'; 
class c{ 
function fun() { 
include('2.php'); 
echo "\n-----in class fun---\n"; 
global $g1; 
var_dump("\$g1 => ", $g1 
,'$g2 => ', $g2 
,'$gg2 => ', $gg2 
); 
echo "\n--------\n"; 
} 
} 
c::fun(); 
echo "\n--- in 1.php ----\n"; 
var_dump('$g1 => ', $g1 
,'$g2 => ', $g2 
,'$gg2 => ', $gg2); 
echo "\n--- ----\n"; 

代码2.php

代码如下:

 
<?php
/*   四海网 www.q1010.com   */
 
$g2 = 'g2'; 
global $gg2;//本环境下并非全局,需要提升 
$gg2 = 'gg2'; 
function g2fun() { 
global $g1, $g2, $gg2; 
echo "\n--- in g2fun ----\n"; 
var_dump('$g1 => ', $g1, '$g2 => ', $g2 
, '$gg2 => ', $gg2); 
echo "\n--- ----\n"; 
} 
g2fun(); 
echo "\n--- in 2.php ----\n"; 
var_dump('$g1 => ', $g1, '$g2 => ', $g2 
, '$gg2 => ', $gg2 
); 
echo "\n--- ----\n"; 
global $g1; 
echo "\n--- in 2.php global----\n"; 
var_dump('$g1 => ', $g1, '$g2 => ', $g2 
, '$gg2 => ', $gg2 
); 
echo "\n--- ----\n"; 

结果

代码如下:

 
--- in g2fun ---- 
string(7) "$g1 => " 
string(2) "g1" 
string(7) "$g2 => " 
NULL 
string(8) "$gg2 => " 
string(3) "gg2" 
--- ---- 
--- in 2.php ---- 
string(7) "$g1 => " 
NULL 
string(7) "$g2 => " 
string(2) "g2" 
string(8) "$gg2 => " 
string(3) "gg2" 
--- ---- 
--- in 2.php global---- 
string(7) "$g1 => " 
string(2) "g1" 
string(7) "$g2 => " 
string(2) "g2" 
string(8) "$gg2 => " 
string(3) "gg2" 
--- ---- 
-----in class fun--- 
string(7) "$g1 => " 
string(2) "g1" 
string(7) "$g2 => " 
string(2) "g2" 
string(8) "$gg2 => " 
string(3) "gg2" 
-------- 
--- in 1.php ---- 
string(7) "$g1 => " 
string(2) "g1" 
string(7) "$g2 => " 
NULL 
string(8) "$gg2 => " 
string(3) "gg2" 
--- ---- 

由此可见,
在class中include后,被include文件变量域已经变成func中了,非全局.
但是可以通过global提升.
一般被include文件在编写时,可能会由于没有注意到被include的情况,就觉得有点郁闷了.

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关键词：class