array_udiff
用回调函数比较数据来计算数组的差集
&reftitle.description;
arrayarray_udiff
arrayarray
arrayarrays
callablevalue_compare_func
使用回调函数比较数据，计算数组的不同之处。和 array_diff 不同的是，前者使用内置函数进行数据比较。
&reftitle.parameters;
array
第一个数组。
arrays
要对比的数组。
value_compare_func
&sort.callback.description;
&sort.callback.description.presort;
&reftitle.returnvalues;
返回 array 里没有出现在其他参数里的所有值。
&reftitle.examples;
<function>array_udiff</function> 使用 stdClass 对象的示例
width = 11; $array1[0]->height = 3;
$array1[1]->width = 7; $array1[1]->height = 1;
$array1[2]->width = 2; $array1[2]->height = 9;
$array1[3]->width = 5; $array1[3]->height = 7;
$array2[0]->width = 7; $array2[0]->height = 5;
$array2[1]->width = 9; $array2[1]->height = 2;
function compare_by_area($a, $b) {
$areaA = $a->width * $a->height;
$areaB = $b->width * $b->height;
if ($areaA < $areaB) {
return -1;
} elseif ($areaA > $areaB) {
return 1;
} else {
return 0;
}
}
print_r(array_udiff($array1, $array2, 'compare_by_area'));
?>
]]>
&example.outputs;
stdClass Object
(
[width] => 11
[height] => 3
)
[1] => stdClass Object
(
[width] => 7
[height] => 1
)
)
]]>
<function>array_udiff</function> 使用 DateTime 对象的示例
modify('Monday this week midnight');
$end = clone $start;
$end->modify('Friday this week midnight');
$interval = new DateInterval('P1D');
foreach (new DatePeriod($start, $interval, $end) as $freeTime) {
$this->free[] = $freeTime;
}
}
public function bookAppointment(DateTime $date, $note) {
$this->booked[] = array('date' => $date->modify('midnight'), 'note' => $note);
}
public function checkAvailability() {
return array_udiff($this->free, $this->booked, array($this, 'customCompare'));
}
public function customCompare($free, $booked) {
if (is_array($free)) $a = $free['date'];
else $a = $free;
if (is_array($booked)) $b = $booked['date'];
else $b = $booked;
if ($a == $b) {
return 0;
} elseif ($a > $b) {
return 1;
} else {
return -1;
}
}
}
// 为每周日程创建日历
$myCalendar = new MyCalendar;
// 为本周预约一些日程
$myCalendar->bookAppointment(new DateTime('Monday this week'), "Cleaning GoogleGuy's apartment.");
$myCalendar->bookAppointment(new DateTime('Wednesday this week'), "Going on a snowboarding trip.");
$myCalendar->bookAppointment(new DateTime('Friday this week'), "Fixing buggy code.");
// 通过对比 $booked 日期和 $free 日期获取空闲的天数
echo "I'm available on the following days this week...\n\n";
foreach ($myCalendar->checkAvailability() as $free) {
echo $free->format('l'), "\n";
}
echo "\n\n";
echo "I'm busy on the following days this week...\n\n";
foreach ($myCalendar->booked as $booked) {
echo $booked['date']->format('l'), ": ", $booked['note'], "\n";
}
?>
]]>
&example.outputs;
&reftitle.notes;
注意本函数只检查了多维数组中的一维。当然，可以用
array_udiff($array1[0], $array2[0], "data_compare_func");
来检查更深的维度。
&reftitle.seealso;
array_diff
array_diff_assoc
array_diff_uassoc
array_udiff_assoc
array_udiff_uassoc
array_intersect
array_intersect_assoc
array_uintersect
array_uintersect_assoc
array_uintersect_uassoc