[PHP] Is a file included?

[jMerliN]

In PHP, associative arrays are implemented as hash tables. Any operation that does not involve iteration is O(1).

I know. I was saying that include_once is likely implemented as a hash table, whereas the proposals here involve looping through loaded files to check. O(1) vs O(n).

[AngraMainyu]

I know. I was saying that include_once is likely implemented as a hash table,

I wasn't disagreeing, only confirming.

whereas the proposals here involve looping through loaded files to check. O(1) vs O(n).

I should also mention that if the OP checks every include against the list of successfully loaded includes, they're looking at O(n^2) performance, not to mention the performance cost of doing so recursively. O(n) isn't the least of the OP's worries.

[redster]

core coders :D

[Roper]

Such a simple snippet, cheers Jonty!