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Memory addresses are represented using hexadecimal, which is a base-8 counting system.
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memory_get_usage(3) [php man page]

MEMORY_GET_USAGE(3)							 1						       MEMORY_GET_USAGE(3)

memory_get_usage - Returns the amount of memory allocated to PHP

SYNOPSIS
int memory_get_usage ([bool $real_usage = false]) DESCRIPTION
Returns the amount of memory, in bytes, that's currently being allocated to your PHP script. PARAMETERS
o $real_usage - Set this to TRUE to get the real size of memory allocated from system. If not set or FALSE only the memory used by emalloc() is reported. RETURN VALUES
Returns the memory amount in bytes. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.2.1 | | | | | | | Compiling with --enable-memory-limit is no | | | longer required for this function to exist. | | | | | 5.2.0 | | | | | | | $real_usage was added. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 A memory_get_usage(3) example <?php // This is only an example, the numbers below will // differ depending on your system echo memory_get_usage() . " "; // 36640 $a = str_repeat("Hello", 4242); echo memory_get_usage() . " "; // 57960 unset($a); echo memory_get_usage() . " "; // 36744 ?> SEE ALSO
memory_get_peak_usage(3), memory_limit. PHP Documentation Group MEMORY_GET_USAGE(3)

Check Out this Related Man Page

PHP_STRIP_WHITESPACE(3) 						 1						   PHP_STRIP_WHITESPACE(3)

php_strip_whitespace - Return source with stripped comments and whitespace

SYNOPSIS
string php_strip_whitespace (string $filename) DESCRIPTION
Returns the PHP source code in $filename with PHP comments and whitespace removed. This may be useful for determining the amount of actual code in your scripts compared with the amount of comments. This is similar to using php -w from the commandline. PARAMETERS
o $filename - Path to the PHP file. RETURN VALUES
The stripped source code will be returned on success, or an empty string on failure. Note This function works as described as of PHP 5.0.1. Before this it would only return an empty string. For more information on this bug and its prior behavior, see bug report #29606. EXAMPLES
Example #1 php_strip_whitespace(3) example <?php // PHP comment here /* * Another PHP comment */ echo php_strip_whitespace(__FILE__); // Newlines are considered whitespace, and are removed too: do_nothing(); ?> The above example will output: <?php echo php_strip_whitespace(__FILE__); do_nothing(); ?> Notice the PHP comments are gone, as are the whitespace and newline after the first echo statement. PHP Documentation Group PHP_STRIP_WHITESPACE(3)

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