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run code in 150+ php & hhvm versions
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<?php function add_weeks($weeks = 1, $base = 'now') { // normalise base to a unix timestamp if (!is_string($base)) { $base = intval($base); } else { $base = strtotime($base); } // get the date one week from the base $result = strtotime(sprintf("@{$base} +{$weeks} weeks", $base, $weeks)); var_dump(date('Y-m-d', $result)); // if it falls in a different month, get the last day of the base month if (date('n', $base) !== date('n', $result)) { $result = strtotime("@{$base} last day of month"); } return $result; } echo date('Y-m-d', add_weeks(1)) . "\n"; echo date('Y-m-d', add_weeks(2)) . "\n"; echo date('Y-m-d', add_weeks(1, '2012-06-18')) . "\n"; echo date('Y-m-d', add_weeks(2, '2012-06-18')) . "\n";
Output for 5.3.0 - 7.1.0
string(10) "2014-04-04" 2014-04-27 string(10) "2014-04-11" 2014-04-27 string(10) "2012-06-25" 2012-06-25 string(10) "2012-07-02" 2012-07-18
Output for 5.1.0 - 5.2.17
string(10) "2014-04-04" 1970-01-01 string(10) "2014-04-11" 1970-01-01 string(10) "2012-06-25" 2012-06-25 string(10) "2012-07-02" 1970-01-01
Output for 4.3.0 - 5.0.5
string(10) "1970-01-01" 1970-01-01 string(10) "1970-01-01" 1970-01-01 string(10) "1970-01-01" 1970-01-01 string(10) "1970-01-01" 1970-01-01