Funcții ale tablourilor (Array)
PHP Manual

array_udiff

(PHP 5, PHP 7)

array_udiffComputes the difference of arrays by using a callback function for data comparison

Descrierea

array array_udiff ( array $array1 , array $array2 [, array $... ], callable $value_compare_func )

Computes the difference of arrays by using a callback function for data comparison. This is unlike array_diff() which uses an internal function for comparing the data.

Parametri

array1

The first array.

array2

The second array.

value_compare_func

The callback comparison function.

Funcția de comparare trebuie să întoarcă un întreg mai mic, egal cu sau mai mare decât zero dacă primul argument este considerat respectiv mai mic, egal cu sau mai mare decât al doilea argument.

int callback ( mixed $a, mixed $b )

Valorile întoarse

Returns an array containing all the values of array1 that are not present in any of the other arguments.

Exemple

Example #1 array_udiff() example using stdClass Objects

<?php
// Arrays to compare
$array1 = array(new stdclass, new stdclass,
                new 
stdclass, new stdclass,
               );

$array2 = array(
                new 
stdclass, new stdclass,
               );

// Set some properties for each object
$array1[0]->width 11$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'));
?>

Exemplul de mai sus va afișa:

Array
(
    [0] => stdClass Object
        (
            [width] => 11
            [height] => 3
        )

    [1] => stdClass Object
        (
            [width] => 7
            [height] => 1
        )

)

Example #2 array_udiff() example using DateTime Objects

<?php
class MyCalendar {
    public 
$free = array();
    public 
$booked = array();

    public function 
__construct($week 'now') {
        
$start = new DateTime($week);
        
$start->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;
        }
    }
}

// Create a calendar for weekly appointments
$myCalendar = new MyCalendar;

// Book some appointments for this week
$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.");

// Check availability of days by comparing $booked dates against $free dates
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"
}
?>

Exemplul de mai sus va afișa:

I'm available on the following days this week...

Tuesday
Thursday


I'm busy on the following days this week...

Monday: Cleaning GoogleGuy's apartment.
Wednesday: Going on a snowboarding trip.
Friday: Fixing buggy code.

Note

Notă: Please note that this function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using array_udiff($array1[0], $array2[0], "data_compare_func");.

A se vedea și


Funcții ale tablourilor (Array)
PHP Manual