Usage: php /srv2/lede/lede-20180110/build_dir/target-mips_24kc_musl/php-7.2.1/ext/spl/examples/dba_array.php <file> <handler> <key> [<value>]

If <value> is specified then <key> is set to <value> in <file>.
Else the value of <key> is printed only.