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php variable variables

I'm sure, some time we need to create variable dynamically. the normal variable declaration in PHP is starting with dollar signs $ .
an example

$fruit = 'banana';
$fruit is a variable when 'banana' is a string value for that variable. when we do echo $fruit, the result is 'banana'.
an example

$fruit = 'banana';
echo $fruit;
//result : banana
This is a static variable. How about when I want to create new variable in a run time?. You can do it by adding double dollar sign
an example

$fruit = 'banana';
$$fruit = 'durian';
echo $banana;
//result : durian

You can download sample file : How to use variable variables in php
more information


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