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@ 2017-08-13T02:29:03Z

<?php

var_dump(
  filter_var('abc', FILTER_CALLBACK, ['flags' => FILTER_FORCE_ARRAY, 'options' => function ($v) { return strlen($v); }])
);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
filter_var: documentation ( source)

preferences:dark modelive preview

63.55 ms | 402 KiB | 5 Q