<?php $a = [ 'color' => 'red', 'taste' => 'sweet', 'shape' => 'round', 'name' => 'apple' ]; $a += ['myKey' => 'foo']; // this is added because the key doesn't exist $a += ['shape' => 'bar']; // this is ignored because the already key exists $a += ['zero']; // this is added because the 0 key doesn't exist $a += ['not zero']; // this is ignored because the 0 key already exists var_export($a);
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