What is the difference between $ var and $$ var?

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What is the difference between $ var and $$ var?

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#1 by (5 votes)

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What is the difference between a $ var and $$ var variable in PHP? How can it be used? Can you cite some examples of use?

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asked by anonymous 01.05.2015 / 16:54

1 answer

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score 5 · Accepted Answer

$var is a variable and $$var is a "variable variable" whose name is the value of $ var.

see example:

<?php

    $var = "hoje";
    echo $var;
    $$var = 'ontem';
    echo $hoje;
?>

Using $$var is not very common (I almost see no use in applications) but I've seen it once: the code creator had used it to dynamically create variables with the $ _GET array key name.

see:

link