checking memory_limit in PHP

Question

I'm need to check if memory_limit is at least 64M in my script installer. This is just part of PHP code that should work, but probably due to this "M" it's not reading properly the value. How to fix this ?

  //memory_limit
    echo "<phpmem>";
    if(key_exists('PHP Core', $phpinfo))
    {
        if(key_exists('memory_limit', $phpinfo['PHP Core']))
        {
            $t=explode(".", $phpinfo['PHP Core']['memory_limit']);
            if($t[0]>=64)
                $ok=1;
            else
                $ok=0;
            echo "<val>{$phpinfo['PHP Core']['memory_limit']}</val><ok>$ok</ok>";
        }
        else
           echo "<val></val><ok>0</ok>";
    }
    else
        echo "<val></val><ok>0</ok>";
    echo "</phpmem>\n"; 

Answer 1

Checking on command line:

php -i | grep "memory_limit"