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@ 2019-11-17T13:55:07Z

<?php

class Apm {
    public $duration;
    function __construct($duration) {
        $this->duration = $duration;
    }
}

$apps = [    
      "09:00" => new Apm(45),
      "09:15" => "",     // I want to delete this row -> 15 minutes
      "09:30" => "",     // I want to delete this row -> 30 minutes  end of the appointment
      "09:45" => "",
      "10:00" => new Apm(60),
      "10:15" => "",     // I want to delete this row -> 15 minutes
      "10:30" => "",     // I want to delete this row -> 30 minutes
      "10:45" => "",     // I want to delete this row -> 45 minutes
      "11:00" => "",     // I want to delete this row -> 60 minutes end of the appointment
      "11:15" => "",
      "11:30" => "",
      "11:45" => new Apm(90),
];
$duration = 0;
$filtered = array_filter(
    $apps,
    function ($apm) use (&$duration) {
        if ($duration === 0) {
            if (!empty($apm->duration)) {
                $duration = $apm->duration - 15;
                return true;
            } else {
                return true;
            }
        } else {
            $duration -= 15;
            return false;    
        }
    }
);

print_r($filtered);

Output for 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1: Array ( [09:00] => Apm Object ( [duration] => 45 ) [09:45] => [10:00] => Apm Object ( [duration] => 60 ) [11:00] => [11:15] => [11:30] => [11:45] => Apm Object ( [duration] => 90 ) )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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