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<?php $data = array('a'=>1,'b'=>2,'c'=>3,'d'=>4,'e'=>5); $key = 'd'; if( array_key_exists( $key, $data )): $pos = array_search( $key, array_keys( $data ) ); $start = array_slice( $data, 0, $pos ); $end = array_slice( $data, $pos, count( $data ) ); $data = array_merge( $start, array( null ), $end ); endif; var_dump( $data );
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(6) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) [0]=> NULL ["d"]=> int(4) ["e"]=> int(5) }