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@ 2017-09-12T14:28:13Z

<?php

$a = array(1=>1, 3=>3, 5=>5, 7=>7);
$a = new ArrayObject($a);

foreach ($a as $k => $v) {
    var_dump("$k => $v");
    if ($k == 3) {
        $a['a'] = "?";
    }
}
?>

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

68.39 ms | 402 KiB | 5 Q