Use indirect variable reference in PHP
Description
The following code shows how to use indirect variable reference.
Example
/*from w w w.ja va 2 s . c o m*/
<?php
//set variables
$var_name = "myValue";
$myValue = 123.456;
$array_name = "myArray";
$myArray = array(1, 2, 3);
//prints "123.456"
print($$var_name . "<br>\n");
//prints "$myValue"
//$var_name expands to "myValue", but indirect
//reference doesn't work inside quoted strings,
//and the extra dollar sign is printed as-is
print("$$var_name<br>\n");
//prints "123.456"
//Uses special notation to embed complex variables
//inside strings
print("{$$var_name}<br>\n");
//prints "3"
print(${$array_name}[2] . "<br>\n");
?>
The code above generates the following result.
