What php configuration variable disallows concatenated array indexes?

Question

EG

if(!isset($am_states[$lot.'_-40C'])){

or

$am_states[$temp."_".$states[$i]['temperature']] = $states[$i]['temperature'];

Whenever I have arrays with concatenated string as array-keys php returns an error:

Parse error: syntax error, unexpected '.', expecting ']'

So I am assuming something is wrong with the server configuration although I am sure i changed something on my local configuration. Last time i changed the configuration was when i setup my apache/mysql/php installation

that is PHP Version 5.3.1,Apache/2.2.14,MYSQL5.1.41 (default from xampp1.7.3)

so I was using this syntaxes 7 months ago and they were working properly. It just now that they produce errors. Anyone can help?

Answer 1

Are you positive about the PHP version you're using? The following test (using PHP 5.3.6 (cli)) works without issue. Perhaps you could post a more complete example?

#!/usr/bin/env php
<?php

$states = array(
    array('temperature' => 40),
    array('temperature' => 50),
    array('temperature' => 60)
);

$temp = 'test';
$i = 2;

$am_states[$temp . "_" . $states[$i]['temperature']] = $states[$i]['temperature'];

var_dump($am_states);

The output of this script is:

array(1) {
  ["test_60"]=>
  int(60)
}