01-30-2007
I don't know what running "sum on software" means. I don't know what item is being compared to what other item. Are there even two items involved? Are you running sum on an item and later running sum again on the same item?
Because you are running sum on an empty directory, it is clear that you are actually using the directory as input. (As opposed to running sum on the contents of the directory.)
You say "Then our software is deleted, and reinstalled.". You do this because you're not happy with the sum on an empty directory?
A directory entry is a name and an inode number. A directory has many of these. A directory entry is deleted by clobbered the beginning of the name. Directories grow but do not shrink. Two empty directories may be of different sizes. And they may have differents shards of deleted entries laying around. Now put two identical entries in each directory. You may overlay the only differing shard. Or you may still have seemingly identical directories with differing sums.
Because of the tree structure of a file system, there is no legal way to create two identical directories although it can be done through trickery. So I still have no clue as to what you are doing.
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LEARN ABOUT PHP
array_reduce
ARRAY_REDUCE(3) 1 ARRAY_REDUCE(3)
array_reduce - Iteratively reduce the array to a single value using a callback function
SYNOPSIS
mixed array_reduce NULL (array $array, callable $callback, [mixed $initial])
DESCRIPTION
array_reduce(3) applies iteratively the $callback function to the elements of the $array, so as to reduce the array to a single value.
PARAMETERS
o $array
- The input array.
o $callback
-
mixed callback (mixed $carry, mixed $item)
o $carry
- Holds the return value of the previous iteration; in the case of the first iteration it instead holds the value of $ini-
tial.
o $item
- Holds the value of the current iteration.
o $initial
- If the optional $initial is available, it will be used at the beginning of the process, or as a final result in case the array
is empty.
RETURN VALUES
Returns the resulting value.
If the array is empty and $initial is not passed, array_reduce(3) returns NULL.
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.3.0 | |
| | |
| | Changed $initial to allow mixed, previously |
| | integer. |
| | |
+--------+---------------------------------------------------+
EXAMPLES
Example #1
array_reduce(3) example
<?php
function sum($carry, $item)
{
$carry += $item;
return $carry;
}
function multiplication($carry, $item)
{
$carry *= $item;
return $carry;
}
$a = array(1, 2, 3, 4, 5);
$x = array();
var_dump(array_reduce($a, "sum")); // int(15)
var_dump(array_reduce($a, "multiplication", 10)); // int(1200), because: 10*1*2*3*4*5
var_dump(array_reduce($x, "sum", "No data to reduce")); // string(17) "No data to reduce"
?>
SEE ALSO
array_filter(3), array_map(3), array_unique(3), array_count_values(3).
PHP Documentation Group ARRAY_REDUCE(3)