11-08-2010
Variable substitution
Hi,
I have to write a shell script in which I have to substitute a variable within a variable. For example,
var1=aaa
var2=file.$var1.txt
The output should be,
echo $var2
file.aaa.txt
Can someone please help me in getting this. I tried using eval, but it didnt work. I might be using it in a wrong way. Appreciate your response.
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LEARN ABOUT PHP
get_class_vars
GET_CLASS_VARS(3) 1 GET_CLASS_VARS(3)
get_class_vars - Get the default properties of the class
SYNOPSIS
array get_class_vars (string $class_name)
DESCRIPTION
Get the default properties of the given class.
PARAMETERS
o $class_name
- The class name
RETURN VALUES
Returns an associative array of declared properties visible from the current scope, with their default value. The resulting array elements
are in the form of varname => value. In case of an error, it returns FALSE.
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.0.3 | |
| | |
| | get_class_vars(3) will only return the properties |
| | that can be accessed from the current scope. |
| | |
| 5.0.2 | |
| | |
| | Calling get_class_vars(3) will now expose all |
| | the properties as an array, unlike previous be- |
| | haviour where protected and private properties |
| | were prefixed with nul bytes. |
| | |
| 5.0.1 | |
| | |
| | Calling get_class_vars(3) will expose all prop- |
| | erties, as when converting an object to a class. |
| | |
+--------+---------------------------------------------------+
EXAMPLES
Example #1
get_class_vars(3) example
<?php
class myclass {
var $var1; // this has no default value...
var $var2 = "xyz";
var $var3 = 100;
private $var4;
// constructor
function myclass() {
// change some properties
$this->var1 = "foo";
$this->var2 = "bar";
return true;
}
}
$my_class = new myclass();
$class_vars = get_class_vars(get_class($my_class));
foreach ($class_vars as $name => $value) {
echo "$name : $value
";
}
?>
The above example will output:
var1 :
var2 : xyz
var3 : 100
Example #2
get_class_vars(3) and scoping behaviour
<?php
function format($array)
{
return implode('|', array_keys($array)) . "
";
}
class TestCase
{
public $a = 1;
protected $b = 2;
private $c = 3;
public static function expose()
{
echo format(get_class_vars(__CLASS__));
}
}
TestCase::expose();
echo format(get_class_vars('TestCase'));
?>
The above example will output:
// 5.0.0
a| * b| TestCase c
a| * b| TestCase c
// 5.0.1 - 5.0.2
a|b|c
a|b|c
// 5.0.3 +
a|b|c
a
SEE ALSO
get_class_methods(3), get_object_vars(3).
PHP Documentation Group GET_CLASS_VARS(3)