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run code in 150+ php & hhvm versions
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<?php $A = "1 131 2 12 53"; preg_match_all("/(\h)*131(\h)*/", $A, $phones); var_dump($phones);
Output for 4.4.9, 5.2.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> array(1) { [0]=> string(5) " 131 " } [1]=> array(1) { [0]=> string(1) " " } [2]=> array(1) { [0]=> string(1) " " } }
Output for 4.3.0 - 4.4.8, 5.0.0 - 5.2.3
array(3) { [0]=> array(1) { [0]=> string(3) "131" } [1]=> array(1) { [0]=> string(0) "" } [2]=> array(1) { [0]=> string(0) "" } }