array_udiff

PHP 5, PHP 7, PHP 8

array_udiff - Computes the difference of arrays by using a callback function for data comparison

Code Examples

Example #1 array_udiff example using stdClass Objects

Result: Array ( [0] => stdClass Object ( [width] => 11 [height] => 3 ) [1] => stdClass Object ( [width] => 7 [height] => 1 ) )

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Example #2 array_udiff example using DateTime Objects

Result: 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.

<?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"; 
}

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array_udiff

Example #1 array_udiff example using stdClass Objects

Example #2 array_udiff example using DateTime Objects

Function array_udiff:

Arrays Functions

Most used PHP functions