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Improving performance of Set::diff()

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This commit is contained in:
José Lorenzo Rodríguez 2010-01-29 15:31:07 -04:30
parent 0abe9afc15
commit fde10b1e62
1 changed files with 9 additions and 18 deletions
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25
cake/libs/set.php
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@ -777,7 +777,8 @@ class Set {
*
* @param mixed $val1 First value
* @param mixed $val2 Second value
* @return array Computed difference
* @return array Returns the key => value pairs that are not common in $val1 and $val2
* The expression for this function is ($val1 - $val2) + ($val2 - ($val1 - $val2))
* @access public
* @static
*/
@ -788,25 +789,15 @@ class Set {
if (empty($val2)) {
return (array)$val1;
}
$out = array();
foreach ($val1 as $key => $val) {
$exists = array_key_exists($key, $val2);
if ($exists && $val2[$key] != $val) {
$out[$key] = $val;
} elseif (!$exists) {
$out[$key] = $val;
}
$intersection = array_intersect_key($val1,$val2);
while (list($key,) = each($intersection)) {
if ($val1[$key] == $val2[$key]) {
unset($val1[$key]);
unset($val2[$key]);
}
}
foreach ($val2 as $key => $val) {
if (!array_key_exists($key, $out)) {
$out[$key] = $val;
}
}
return $out;
return $val1 + $val2;
}
/**