note 102035 added to function.usort
| From: | cmanley_nl at osu1 dot php dot net | Date: | Mon, 24 Jan 2011 19:55:40 +0000 |
| Subject: | note 102035 added to function.usort | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-176252@lists.php.net to get a copy of this message | ||
I had to sort a result set by host. I made this comparator function to use in usort calls.
Sorts by host segment so that a.org comes after b.com, etc.
function hostcmp($a, $b) {
$a = strtolower($a);
$b = strtolower($b);
if ($a == $b) {
return 0;
}
$parts_a = array_reverse(explode('.', $a));
$parts_b = array_reverse(explode('.', $b));
$max = max(count($parts_a), count($parts_b));
for ($i=0; $i < $max; $i++) {
if (($i < count($parts_a)) && ($i < count($parts_b))) {
if ($c = strcmp($parts_a[$i],$parts_b[$i])) {
return $c;
}
}
else {
// Return numeric cmp on array sizes. PHP doesn't have a <=> operator, so emulate it.
//return count($parts_a) <=> count($parts_b);
return count($parts_a) == count($parts_b) ? 0 : (count($parts_a) < count($parts_b) ? -1 : 1);
}
}
return 0;
}
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Server IP: 213.249.64.162
Probable Submitter: 80.101.188.146
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Manual Page -- http://www.php.net/manual/en/function.usort.php
Edit -- https://master.php.net/note/edit/102035
Del: integrated -- https://master.php.net/note/delete/102035/integrated
Del: useless -- https://master.php.net/note/delete/102035/useless
Del: bad code -- https://master.php.net/note/delete/102035/bad+code
Del: spam -- https://master.php.net/note/delete/102035/spam
Del: non-english -- https://master.php.net/note/delete/102035/non-english
Del: in docs -- https://master.php.net/note/delete/102035/in+docs
Del: other reasons-- https://master.php.net/note/delete/102035
Reject -- https://master.php.net/note/reject/102035
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