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run code in 150+ php & hhvm versions
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<?php $number_to_get = 2; $names = array("Maria", "Jan", "Elton", "Wiktor"); shuffle($names); $picks = array_slice(array_values($names), 0, $number_to_get); var_dump($picks);
Output for 4.4.5, 5.1.6, 5.2.1, 5.2.3, 5.3.2, 5.4.9, 5.4.11, 7.1.0
array(2) { [0]=> string(3) "Jan" [1]=> string(5) "Elton" }
Output for 4.4.0 - 4.4.1, 4.4.6, 5.2.2, 5.2.4 - 5.2.5, 5.3.0, 5.3.6, 5.4.5, 5.4.40, 7.0.14
array(2) { [0]=> string(5) "Elton" [1]=> string(3) "Jan" }
Output for 4.3.7, 5.1.0, 5.2.16, 5.3.5, 5.3.12 - 5.3.13, 5.3.15, 5.4.2, 5.4.8, 5.4.14, 5.4.22, 5.4.31, 5.4.36, 5.4.42, 5.5.26, 5.6.10, 5.6.15, 7.0.2, 7.0.6
array(2) { [0]=> string(6) "Wiktor" [1]=> string(5) "Maria" }
Output for 5.0.1, 5.0.4, 5.1.1, 5.2.7, 5.2.9, 5.3.4, 5.3.10, 5.3.27, 5.3.29, 5.5.25, 5.5.34, 5.6.18, 5.6.21, hhvm-3.12.0, 7.0.5
array(2) { [0]=> string(3) "Jan" [1]=> string(6) "Wiktor" }
Output for 4.3.2, 4.3.8, 4.4.8, 5.1.2, 5.2.0, 5.2.12, 5.3.18, 5.3.22, 5.3.24, 5.4.1, 5.4.15 - 5.4.17, 5.4.26, 5.4.39, 5.5.32, 5.6.9, 5.6.16, 7.0.4
array(2) { [0]=> string(3) "Jan" [1]=> string(5) "Maria" }
Output for 4.3.0, 4.4.7, 5.1.4, 5.2.6, 5.2.15, 5.3.1, 5.3.14, 5.4.3 - 5.4.4, 5.4.6, 5.4.20, 5.4.30, 5.4.35, 5.4.43, 5.5.24, 5.6.12, 5.6.17, 7.0.3
array(2) { [0]=> string(5) "Elton" [1]=> string(5) "Maria" }
Output for 5.0.0, 5.1.3, 5.2.11, 5.3.7, 5.3.17, 5.3.19, 5.3.21, 5.4.0, 5.4.37, 5.4.41, 5.6.19, 7.0.1
array(2) { [0]=> string(5) "Maria" [1]=> string(6) "Wiktor" }
Output for 4.3.3 - 4.3.4, 4.4.9, 5.2.13 - 5.2.14, 5.3.11, 5.3.28, 5.4.10, 5.4.13, 5.4.18, 5.4.21, 5.4.32 - 5.4.34, 5.4.44, 5.5.27, 5.5.29, 7.0.0
array(2) { [0]=> string(5) "Maria" [1]=> string(5) "Elton" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.5, 4.4.2, 4.4.4, 5.2.8, 5.2.17, 5.3.20, 5.4.23, 5.4.25, 5.4.45, 5.5.28, 5.5.33, 5.6.20, 5.6.28
array(2) { [0]=> string(5) "Maria" [1]=> string(3) "Jan" }
Output for 4.3.1, 4.3.9 - 4.3.11, 5.0.3, 5.0.5, 5.1.5, 5.3.3, 5.3.16, 5.3.25, 5.4.7, 5.4.12, 5.4.27, 5.4.29, 5.4.38, 5.6.8, 5.6.13 - 5.6.14
array(2) { [0]=> string(6) "Wiktor" [1]=> string(3) "Jan" }
Output for 4.3.6, 4.4.3, 5.0.2, 5.3.8 - 5.3.9, 5.4.19, 5.4.24, 5.5.30, 5.5.35, 5.6.11
array(2) { [0]=> string(6) "Wiktor" [1]=> string(5) "Elton" }
Output for 5.2.10, 5.3.23, 5.3.26, 5.4.28, 5.5.31
array(2) { [0]=> string(5) "Elton" [1]=> string(6) "Wiktor" }