<?php //version 1 $a = [1, 2, 3]; $b = 4; $a += [$b]; print_r($a); //output: Array ( [0] => 1 [1] => 2 [2] => 3 ) //version 2 $c = [1, 2, 3]; $d = 4; if(!in_array($d, $c)) $c[] = $d; print_r($c); //output: Array ( [0] => 1 [1] => 2 [2] => 3 )
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