practice/scope_variable.php at main · sameer476/practice · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
<?php
     // 1. Local scope
// function myTest() {
//     $x = 25;
//     echo "it is a inside the function: $x";
// }
// myTest();
// echo "it is a outside the function: $x";
?>

<!-- // 2. Global scope -->

<?php
// $x = 25;
// function myTest() {
//     echo "it is a inside the function: $x";
// }
// myTest();
// echo "it is a outside the function: $x";
?>

<!-- // 2. Global keyword -->
<?php
// $x = 10;
// $y = 10;
// function myTest() {
//     global $x, $y;
//     $y = $x + $y;
// }
// myTest();
// echo "it is a outside the function: $y";
?>

<?php
// $x = 10;
// $y = 10;
// function myTest() {
//     $GLOBALS['y'] = $GLOBALS['x'] + $GLOBALS['y'];
// }
// myTest();
// echo "it is a outside the function: $y";
?>
<?php

   // by static variable
// function myTest() {
//      static $x = 10;
//     echo "$x";
//     $x--;
// }
// myTest();
// echo "<br>";

// myTest();
// echo "<br>";

// myTest();
// echo "<br>";

// myTest();
// echo "<br>";

// myTest();
// echo "<br>";

// myTest();
// echo "<br>";
// myTest();
// echo "<br>";

// myTest();
// echo "<br>";

// myTest();
// echo "<br>";

// myTest();
// echo "<br>";
?>

  <!-- //by normal variable -->

<?php
function myTest() {
     static $x = 10;
    echo "$x";
    $x--;
}
myTest();
echo "<br>";

myTest();
echo "<br>";

myTest();
echo "<br>";

myTest();
echo "<br>";

myTest();
echo "<br>";

myTest();
echo "<br>";
myTest();
echo "<br>";

myTest();
echo "<br>";

myTest();
echo "<br>";

myTest();
echo "<br>";
?>