This is a PHP extension meant to provide internal data structure analysis capabilities for the PHP Array data type. The extension currently is experimental and is not meant for production use.

There is currently only one function provided by this extension: array_size

The array_size function expects an array as the first argument, with an optional second boolean argument which when true will output debug information about the array's internal structure, including a break down of the memory allocation units and hash collision information. The function returns an integer representing the total memory consumed in bytes for the array supplied as the first argument.

The debug information can be used to determine where hash collisions arise in the array, but currently this is useless in its present form as the function does not return this information directly to user space.

The function works recursively so the total sum of all the array's parts and dimensions will be accounted for.

$arr = array(1,2,3);
var_dump(array_size($arr));

/* Output */

int(448)

• Unpack the tarball into a directory of choice (e.g. /usr/local/src/) and run phpize.
• Run ./configure
• Run make and make install
• Edit your php.ini by adding the line extension=aa.so at the end
• Restart your PHP and enjoy