What is the difference between $var and $$var in PHP?
$var is a normal variable. $$var is called a variable variable. PHP takes the value stored in $var and uses it as the name of another variable.
<?php
$var = "city";
$$var = "Delhi"; // same as $city = "Delhi";
echo $var . "<br>";
echo $$var . "<br>";
echo $city;
?>Output:
Tutorials Class - Output Window
city
Delhi
Delhi
Variable variables are hard to read and debug, so use them rarely. In most cases an array is a better choice. See PHP Variables for the basics.
Learn more about the similar topics:
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| PHP Variables |