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  1. #1
    Senior Member
    Join Date
    Jan 2014
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    Banglore
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    289

    Indirect References to Variables

    An extremely useful feature of PHP is that you can access variables by using indirect references, or to put it simply, you can create and access variables by name at runtime.

    Consider the following example:

    $name = "John";
    $$name = "Registered user";
    print $John;
    This code results in the printing of" Registered user ." The bold line uses an additional $ to access the variable with name specified by the value of $name ("John" ) and changing its value to "Registered user". Therefore, a variable called $John is created.

    You can use as many levels of indirections as you want by adding additional $ signs in front of a variable

  2. #2
    Senior Member
    Join Date
    Jan 2015
    Posts
    567

    Re: Indirect References to Variables

    A variable variable takes the value of a variable and treats that as the name of a variable.I must have a reference for each particular object instantiation in the order which they function indirect ($var, $value) // Replaces $$var = $value.

  3. #3
    Senior Member
    Join Date
    Sep 2018
    Posts
    242

    Re: Indirect References to Variables

    The actual notation is \$$var, usually preceded by an eval (and sometimes an echo). This is called an indirect reference. Indirect referencing in Bash is a multi-step process. First, take the name of a variable: varname.

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