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Clarify pitfalls document.

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epriestley 2011-06-27 17:40:34 -07:00
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commit 63436ad74a
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10
src/docs/flavortext/php_pitfalls.diviner
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@ -4,9 +4,9 @@
This document discusses difficult traps and pitfalls in PHP, and how to avoid,
work around, or at least understand them.
= array_merge() in Incredibly Slow =
= array_merge() in Incredibly Slow When Merging A List of Arrays =
If you merge arrays like this:
If you merge a list of arrays like this:
COUNTEREXAMPLE
$result = array();
@ -14,9 +14,9 @@ If you merge arrays like this:
$result = array_merge($result, $one_list);
}
...your program now has a huge runtime runtime because it generates a large
number of intermediate arrays and copies every element it has previously seen
each time you iterate.
...your program now has a huge runtime because it generates a large number of
intermediate arrays and copies every element it has previously seen each time
you iterate.
In a libphutil environment, you can use ##array_mergev($list_of_lists)##
instead.