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run code in 200+ php & hhvm versions
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<?php var_dump( filter_var('abc', FILTER_CALLBACK, ['flags' => FILTER_FORCE_ARRAY, 'options' => function ($v) { return strlen($v); }]) );
Output for 5.6.0 - 5.6.30, hhvm-3.18.4 - 3.21.0, 7.0.0 - 7.1.8
int(3)