Question

Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to
allocate 24 bytes)
in /home/fevsdiet/public_html/xxxxxxx.co.uk/booking/includes/functions.php
on line 481

What does this mean and how would one go about fixing it?

This is the code that is erroring:

   $availabilityArr = array();              
    #TODO - check if "to" is < "from" = means that "to" is +1 day.
    $st = date("Y-m-d H:i", strtotime($date." +".$tt[2]." minutes"));
    $et = date("Y-m-d H:i", strtotime($date." +".$tt[3]." minutes"));
    $a = $st;
    $n = 0; //layout counter
    $b = date("Y-m-d H:i", strtotime($a." +".$int." minutes")); //default value for B is start time.
    for( $a = $st ; $b <= $et ; $b = 
                       date("Y-m-d H:i", strtotime($a." +".$int." minutes")))
    {
        $availabilityArr[date("Y-m-d", strtotime($a))][] = date("H:i", strtotime($a));
        $a = $b;
        $n++;
    }

Answer 1

Basically, it means that PHP doesn’t have any allowed memory left. This can be tweaked, using memory_limit clause, in your php.ini.

If you are on a shared hosting, you might not be able to edit the php.ini. You still can try to use a .htaccess file :

1. Create an file named .htaccess on the root of you web dir (usually /www or /web)

2. Use the php_value clause :

   php_value memory_limit 128M #for example
   

This is caused by some of your code, that try to use too many, or too big variables. Usually it’s an infinite loop, or fetching a lot of data from a DB into one array,