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@ 2018-10-28T12:30:29Z

<?php

function find_closest() {
  $now = date('Y-m-d');
  $date_array = array(
      '29-10-2018',
      '4-11-2018',
      '25-11-2018',
      '2-12-2018',
      '16-12-2018',
      '23-12-2018',
      '30-12-2018',
      '27-01-2019',
      '24-02-2019',
      '31-03-2019',
      '14-04-2019',
      '28-04-2019',
      '26-05-2019',
      '30-06-2019',
      '28-07-2019',
      '25-08-2019',
      '29-09-2019',
      '27-10-2019',
      '24-11-2019',
      '15-12-2019',
      '22-12-2019',
      '29-12-2019'
  );

  foreach($date_array as $day) {
    $interval[] = abs(strtotime($now) - strtotime($day));
  }

  asort($interval);
  $closest = key($interval);
  return $array[$closest];
}

function is_today() {
  $date_array = array(
      '29-10-2018',
      '4-11-2018',
      '25-11-2018',
      '2-12-2018',
      '16-12-2018',
      '23-12-2018',
      '30-12-2018',
      '27-01-2019',
      '24-02-2019',
      '31-03-2019',
      '14-04-2019',
      '28-04-2019',
      '26-05-2019',
      '30-06-2019',
      '28-07-2019',
      '25-08-2019',
      '29-09-2019',
      '27-10-2019',
      '24-11-2019',
      '15-12-2019',
      '22-12-2019',
      '29-12-2019'
  );
  $now = date("Y-m-d");
  $now_datetime = new DateTime($now);
  //
  foreach($date_array as $date) {
    $match_date = new DateTime($date);
    $interval = $now_datetime->diff($match_date);
    if($interval->days === 0) {
        return true;
        break;
    } else {
      return false;
    }
  }
}

var_dump(find_closest());

Output for 8.3.0 - 8.3.4, 8.3.6: Warning: Undefined variable $array in /in/3Ecvp on line 36 Warning: Trying to access array offset on null in /in/3Ecvp on line 36 NULL
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Warning: Undefined variable $array in /in/3Ecvp on line 36 Warning: Trying to access array offset on null in /in/3Ecvp on line 36 NULL
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18: Warning: Undefined variable $array in /in/3Ecvp on line 36 Warning: Trying to access array offset on value of type null in /in/3Ecvp on line 36 NULL
Output for 7.4.0 - 7.4.33: Notice: Undefined variable: array in /in/3Ecvp on line 36 Notice: Trying to access array offset on value of type null in /in/3Ecvp on line 36 NULL
Output for 7.3.32 - 7.3.33: NULL
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31: Notice: Undefined variable: array in /in/3Ecvp on line 36 NULL

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