PHP var_dump function and application code for traversing object Properties _php Tutorial

In this article we are going to provide you with two ways to iterate over object properties and illustrate the application of traversal object properties in PHP. You can see that private variables and static variables are not available, and can only be read if they are defined as public variables.
The first method of traversing object properties:
Copy CodeThe code is as follows:
class Foo {
Private $a;
public $b = 1;
Public $c;
Private $d;
Static $e;
Public Function test () {
Var_dump (Get_object_vars ($this));
}
}
$test = new Foo;
Var_dump (Get_object_vars ($test));
$test->test ();
?>

The results are as follows:
Array (2) {
["B"]=>
Int (1)
["C"]=>
Null
}
Array (4) {
["A"]=>
Null
["B"]=>
Int (1)
["C"]=>
Null
["D"]=>
Null
}
traversing Object Properties The second method:
Copy CodeThe code is as follows:
class Foo {
Private $a;
public $b = 1;
Public $c = ' jb51.net ';
Private $d;
Static $e;
Public Function test () {
Var_dump (Get_object_vars ($this));
}
}
$test = new Foo;
Var_dump (Get_object_vars ($test));
$test->test ();

?>


The results are as follows:
Array (2) {
["B"]=>
Int (1)
["C"]=>
String (8) "Jb51.net"
}
Array (4) {
["A"]=>
Null
["B"]=>
Int (1)
["C"]=>
String (8) "Jb51.net"
["D"]=>
Null
}

var_dump Precautions for use:

To prevent the program from outputting the results directly to the browser, you can use the output control functions to capture the output of this function and save them to a variable such as a string type.
Var_dump Instance Code
Copy CodeThe code is as follows:
$a = Array (1, 2, Array ("A", "B", "C"));
Var_dump ($a);
/* Output:
Array (3) {
[0]=>
Int (1)
[1]=>
Int (2)
[2]=>
Array (3) {
[0]=>
String (1) "a"
[1]=>
String (1) "B"
[2]=>
String (1) "C"
}
}
*/
$b = 3.1;
$c = TRUE;
Var_dump ($b, $c);
/* Output:
Float (3.1)
BOOL (TRUE)
*/
?>

http://www.bkjia.com/PHPjc/322007.html www.bkjia.com true http://www.bkjia.com/PHPjc/322007.html techarticle In This article we are going to provide you with two ways to iterate over object properties and illustrate the application of traversal object properties in PHP. You can see that private variables and static variables get not ...

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