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
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
--TEST--
Test debug_zval_dump() function : usage variations
--FILE--
<?php
/* Prototype: void debug_zval_dump ( mixed $variable );
Description: Dumps a string representation of an internal zend value
to output.
*/
echo "*** Testing debug_zval_dump() on functions ***\n";
echo "--- Variation 1: global variable inside a function ---\n";
$global_var = 10; //declaring global variable
/* function to dump reference count of global variable,$global_var
and local variable,$local_var */
function dump_globalvar( &$local_var ) {
global $global_var;
echo "\n-- Value of local variable inside dump_globalvar() --\n";
debug_zval_dump( $local_var );
echo "\n-- Value of global variable inside dump_globalvar() --\n";
debug_zval_dump( $global_var );
}
/* dump value and reference count of $global_var using debug_zval_dump() */
echo "\n-- Value of global variable, before calling dump_globalvar() --\n";
debug_zval_dump( $global_var );
/* calling function dump_globalvar() to check the reference count of local
and global variables inside the function */
dump_globalvar( $global_var );
/* dump value and reference count of $global_var after exiting function
dump_globalvar();
expected: reference count of $global_var should remain the same as
before calling dump_globalvar() function */
echo "\n-- Value of global variable, after exiting dump_globalvar() --\n";
debug_zval_dump( $global_var );
echo "\n--- Variation 2: one variable references another ---\n";
$first_var = 10;
/* dump value and reference count of $first_var */
echo "\n-- Value of \$first_var: --\n";
debug_zval_dump($first_var);
/* $ref_first_var references $first_var */
$ref_first_var = &$var_1;
echo "\n-- Value of \$ref_first_var --\n";
debug_zval_dump($ref_first_var);
echo "\n-- Value of \$first_var --\n";
debug_zval_dump($first_var);
unset($ref_first_var);
/* dump value and reference count of $first_var, $ref_first_var
here $ref_first_var is unset */
echo "\n-- Value of \$ref_first_var --\n";
debug_zval_dump($ref_first_var);
echo "\n-- Value of \$first_var --\n";
debug_zval_dump($first_var);
echo "\n--- Variation 3: multiple references of variables ---\n";
$var_1 = 10;
$var_2 = &$var_1;
$var_3 = &$var_2;
echo "\n-- Value of \$var_1: (before referencing) --\n";
debug_zval_dump($var_1);
echo "\n-- Value of \$var_2: (referencing var_1) --\n";
debug_zval_dump($var_2);
echo "\n-- Value of \$var_3: (referencing var_2) --\n";
debug_zval_dump($var_3);
/* unsetting $var_3 */
unset($var_3);
echo "\n-- Value of \$var_3: (after unsetting var_3) --\n";
debug_zval_dump($var_3);
echo "\n-- Value of \$var_2: --\n";
debug_zval_dump($var_2);
echo "\n-- Value of \$var_3: --\n";
debug_zval_dump($var_1);
/* unsetting $var_1 */
unset($var_1);
echo "\n-- Value of \$var_1: (after unsetting variable_1) --\n";
debug_zval_dump($var_1);
echo "\n-- Value of \$var_2: --\n";
debug_zval_dump($var_2);
echo "\n*** Testing debug_zval_dump() on miscelleneous input arguments ***\n";
/* unset a variable */
$unset_var = 10.5;
unset($unset_var);
$misc_values = array (
/* nulls */
NULL,
null,
/* unset variable */
@$unset_var,
/* undefined variable */
@$undef_var,
/* mixed types */
@TRUE123,
"123string",
"string123",
"NULLstring"
);
/* loop to display the variables and its reference count using
debug_zval_dump() */
$counter = 1;
foreach( $misc_values as $value ) {
echo "-- Iteration $counter --\n";
debug_zval_dump( $value );
$counter++;
}
echo "Done\n";
?>
--EXPECTF--
*** Testing debug_zval_dump() on functions ***
--- Variation 1: global variable inside a function ---
-- Value of global variable, before calling dump_globalvar() --
long(10) refcount(2)
-- Value of local variable inside dump_globalvar() --
long(10) refcount(1)
-- Value of global variable inside dump_globalvar() --
long(10) refcount(1)
-- Value of global variable, after exiting dump_globalvar() --
long(10) refcount(2)
--- Variation 2: one variable references another ---
-- Value of $first_var: --
long(10) refcount(2)
-- Value of $ref_first_var --
NULL refcount(1)
-- Value of $first_var --
long(10) refcount(2)
-- Value of $ref_first_var --
Notice: Undefined variable: ref_first_var in %s on line %d
NULL refcount(1)
-- Value of $first_var --
long(10) refcount(2)
--- Variation 3: multiple references of variables ---
-- Value of $var_1: (before referencing) --
long(10) refcount(1)
-- Value of $var_2: (referencing var_1) --
long(10) refcount(1)
-- Value of $var_3: (referencing var_2) --
long(10) refcount(1)
-- Value of $var_3: (after unsetting var_3) --
Notice: Undefined variable: var_3 in %s on line %d
NULL refcount(1)
-- Value of $var_2: --
long(10) refcount(1)
-- Value of $var_3: --
long(10) refcount(1)
-- Value of $var_1: (after unsetting variable_1) --
Notice: Undefined variable: var_1 in %s on line %d
NULL refcount(1)
-- Value of $var_2: --
long(10) refcount(2)
*** Testing debug_zval_dump() on miscelleneous input arguments ***
-- Iteration 1 --
NULL refcount(3)
-- Iteration 2 --
NULL refcount(3)
-- Iteration 3 --
NULL refcount(1)
-- Iteration 4 --
NULL refcount(1)
-- Iteration 5 --
string(7) "TRUE123" refcount(3)
-- Iteration 6 --
string(9) "123string" refcount(3)
-- Iteration 7 --
string(9) "string123" refcount(3)
-- Iteration 8 --
string(10) "NULLstring" refcount(3)
Done
|
