1
<?php
2
$a = "1234";
3
echo "<pre>";
4
echo "outer: $a\n";
5
function testa()
6
{
7
global $a;
8
echo " inner testa: $a\n";
9
unset ($a);
10
echo " inner testa: $a\n";
11
}
12
function testb()
13
{
14
global $a;
15
echo " inner testb: $a\n";
16
$a = null;
17
echo " inner testb: $a\n";
18
}
19
testa();
20
echo "outer: $a\n";
21
testb();
22
echo "outer: $a\n";
23
echo "</pre>";
24
?>
25
/***** Result:
26
outer: 1234
27
inner testa: 1234
28
inner testa:
29
outer: 1234
30
inner testb: 1234
31
inner testb:
32
outer:
33
******/
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
2
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
3
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
4
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
5
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
6
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
7
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
8
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
9
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
10
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
11
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
12
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
13
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
14
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
15
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
16
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
17
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
18
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
19
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
20
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
21
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
22
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
23
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
24
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
25
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
26
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
27
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
28
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
29
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
30
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
31
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
32
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
33
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)