實測在class的function中include的文件中非php的global全局環境

2020-03-22 18:31:03

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PHP 實測在html' target='_blank'>class的function中include的文件中非php的global全局環境
測試代碼1.php
復制代碼代碼如下:
?php
$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";

代碼2.php
復制代碼代碼如下:
?php
$g2 = 'g2';
global $gg2;//本環境下并非全局,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";

結果
復制代碼代碼如下:
--- 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"
--- ----

由此可見,
在class中include后,被include文件變量域已經變成func中了,非全局.
但是可以通過global提升.
一般被include文件在編寫時,可能會由于沒有注意到被include的情況,就覺得有點郁悶了.PHP教程

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