Online PHP editor | output for CK3f3

@ 2019-10-09T07:09:37Z

<?php

    function getItem($date, $startDate, $skipped_days){
      $item = array('a','b','c','b','c');
      $diff = date_create($startDate)->diff(date_create($date));
      if($diff->invert) return false; //error $date < $startDate
      return $item[($diff->days - $skipped_days) % 5];
    }

//example for use
$startDate = '2019-10-01';
$skipday = '2019-10-07';
$skipped_days = 0;

$selected_start_date = '2019-10-01';
$selected_end_date = '2019-10-10';

$dates_array = array();
$current_date = strtotime($selected_start_date);
$last_date = strtotime($selected_end_date);

while( $current_date <= $last_date ) {
$dates_array[] = date('Y-m-d', $current_date);
$current_date = strtotime('+1 day', $current_date);     
}

for($i=0; $i<count($dates_array); $i++) {   
$today = $dates_array[$i];
$code = getItem($today, $startDate, $skipped_days);

if($dates_array[$i] == $skipday) {
  $code = "SKIP";
  $skipped_days++;
}

echo $today." ".$code."</br>\n";

}

Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 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 - 7.3.33, 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 - 8.3.26, 8.4.1 - 8.4.13: 2019-10-01 a 2019-10-02 b 2019-10-03 c 2019-10-04 b 2019-10-05 c 2019-10-06 a 2019-10-07 SKIP 2019-10-08 b 2019-10-09 c 2019-10-10 b
Output for 5.2.0 - 5.2.17: Fatal error: Call to undefined method DateTime::diff() in /in/CK3f3 on line 5
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6: Fatal error: Call to undefined function date_create() in /in/CK3f3 on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/CK3f3 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_OBJECT_OPERATOR in /in/CK3f3 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/CK3f3 on line 5
Process exited with code 255.

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