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<?php $dt = new DateTime("2012-05-13"); $dt->modify("Sunday this week"); var_dump($dt->format('r'));
Output for 5.6.23 - 5.6.24, 7.0.8 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.27, 7.4.0 - 7.4.16, 8.0.0 - 8.0.3
string(31) "Sun, 13 May 2012 00:00:00 +0200"
Output for 5.6.0 - 5.6.22, 7.0.0 - 7.0.7
string(31) "Sun, 20 May 2012 00:00:00 +0200"