handling large arrays with array_diff
- by bigmac
I have been trying to compare two arrays. Using array_intersect presents no problems. When using array_diff and arrays with ~5,000 values, it works. When I get to ~10,000 values, the script dies when I get to array_diff. Turning on error_reporting did not produce anything.
I tried creating my own array_diff function:
function manual_array_diff($arraya, $arrayb) {
foreach ($arraya as $keya => $valuea) {
if (in_array($valuea, $arrayb)) {
unset($arraya[$keya]);
}
}
return $arraya;
}
source: http://stackoverflow.com/questions/2479963/how-does-array-diff-work
I would expect it to be less efficient that than the official array_diff, but it can handle arrays of ~10,000. Unfortunately, both array_diffs fail when I get to ~15,000.
I tried the same code on a different machine and it runs fine, so it's not an issue with the code or PHP. There must be some limit set somewhere on that particular server. Any idea how I can get around that limit or alter it or just find out what it is?
