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@ 2013-10-28T16:25:48Z

<?php

var_dump( 
    array(
        'test1' => 1,
        'test2' => 2,
    ) +
    array(
        'test2' => 20,
        'test3' => 30,
    )
);

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

45.33 ms | 402 KiB | 5 Q