Access array value using string containing the variable name followed by square-braced key path

Question

How do I parse string of array so I can get the value of variable

sample string

$str = 'prices[holiday:waterpark][person:1_person]';

sample variable

$prices['holiday:waterpark']['person:1_person'] = 100;

I have tried using variables.variable way in php like this

$prices['holiday:waterpark']['person:1_person'] = 100;
$str = "prices\['holiday:waterpark'\]\['person:1_person'\]";
$str = str_replace('\\', '', $str);
echo $$str;

but that's not working and I get an error

"Undefined variable: $prices['holiday:waterpark']['person:1_person']"

Unlike forum sites, we don't use "Thanks", or "Any help appreciated", or signatures on Stack Overflow. For more details see Should 'Hi', 'thanks,' taglines, and salutations be removed from posts? — Bacteria
– Bacteria, Commented Jun 18, 2015 at 23:55
your post is confusing. What exactly are you trying to achieve? — CodeGodie
– CodeGodie, Commented Jun 19, 2015 at 0:11
sorry i don't know how to explain it any better. Basically i need to parse string to variable so i can get the value of variable — ilmansg
– ilmansg, Commented Jun 19, 2015 at 0:16

userlond · Accepted Answer · 2015-06-19 01:33:46Z

1

Try this

<?
    $prices['holiday:waterpark']['person:1_person'] = 100;
    $str = "prices\['holiday:waterpark'\]\['person:1_person'\]";
    $str = stripslashes($str);
    // be careful with passing $str from untrusted source
    // make necessary variable filtering before!
    echo eval('return $' . $str . ';');

answered Jun 19, 2015 at 1:33

userlond

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