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run code in 150+ php & hhvm versions
Bugs & Features
<?php // Set demo vars $year = 2012; $months = array(10,11,12); $days = array(01,02,03,04,06,07,08,09,11,12,13,14,16,17,18,19,21,22,23,24,26,27,28,29,31); foreach($months AS $month) foreach($days AS $day) die(intval($day)); $datesWS[] = new DateTime(implode('-',array($year,$month,intval($day)))); // Push DateTime object to the WebService array // Sort dates usort($datesWS, function ($a, $b){ return ($a == $b) ? 0 : (($a > $b) ? 1 : -1); }); $dateIni = count($datesWS)>0 ? reset($datesWS) : 0; // Get first date $dateEnd = count($datesWS)>0 ? end($datesWS) : 0; // Get last date var_dump(array_shift($datesWS)); var_dump(array_pop($datesWS)); /* $interval = new DateInterval('P1D'); // Set date interval as 1 day // Generate dates range and Transform iterator to array $datesRange = iterator_to_array(new DatePeriod($dateIni, $interval, $dateEnd->modify( '+1 day' ))); // This way seems to work foreach($datesRange AS $date) { if(!in_array($date->format('d/m/Y'),array_values(array_map(function($obj){ return $obj->format('d/m/Y'); },$datesWS)))) $excludeDates[] = $date->format('d/m/Y'); } // This way should be more efficient, but I'm fed up with it! // Get excluded dates $excludeDates = array_udiff($datesRange, $datesWS, function ($a, $b) { return $a == $b ? 0 : 1; }); // Comment/Uncomment this in order to print this method or the other one // Print array(objects) as array(strings) var_dump(array_values(array_map(function($obj){ return $obj->format('d/m/Y'); },$datesWS))); var_dump(array_values(array_map(function($obj){ return $obj->format('d/m/Y'); },$datesRange))); var_dump(array_values(array_map(function($obj){ return $obj->format('d/m/Y'); },$excludeDates))); */ ?>
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0

Process exited with code 1.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/0pUB6 on line 16
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/0pUB6 on line 16
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/0pUB6 on line 16
Process exited with code 255.