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run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = array( 0 => array() ); var_dump( count( array_filter( $a ) ) ); var_dump( count( array_filter( array_map( 'array_filter', $a ) ) ) );
based on u3DV5
Output for 4.3.0 - 7.2.0
int(0) int(0)