Why use curly braces with key?

Question

3.00/5 (1 vote)

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I found following code what is purpose of using braces around key,like this ${$key}

PHP

$expected = array( 'carModel', 'year', 'bodyStyle' );

foreach( $expected AS $key ) 
{
 if ( !empty( $_POST[ $key ] ) ) {
  ${$key} = $_POST[ $key ];
 }
 else 
 {
  ${$key} = NULL;
 }
}

Posted 4-Jul-13 20:32pm

Infinity Signal

Updated 4-Jul-13 20:41pm

v2

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thanh_bkhn · Accepted Answer · 2013-07-04T20:45:00

Solution 1

This code is similar with

PHP

$carModel = $_POST['carModel'];
$year = $_POST['year'];
$bodyStyle = $_POST['bodyStyle'];

Posted 4-Jul-13 20:45pm

thanh_bkhn