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Full Discussion: Variable substitution
Top Forums Shell Programming and Scripting Variable substitution Post 302469979 by grajp002 on Monday 8th of November 2010 08:36:37 PM
Old 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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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)
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