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@ 2018-05-06T21:07:14Z

<?php

$arr = array();

$v = 'before';
$arr[][$v = 'after'] = $v;

$v = 'before';
$arr[][$v] = $v = 'after';

$v = 'before';
$arr[][$v . ''] = $v = 'after';

var_export($arr);

Output
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var_export: documentation ( source)

preferences:dark modelive preview

28.93 ms | 404 KiB | 5 Q