parse string of array in php -

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how parse string of array can 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 this

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

but thats not working , error 

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

try this

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

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