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<?php $str = "statisticsParams[words]=&statisticsParams[exclude_search_trends]=0&statisticsParams[exclude_search_trends]=1&statisticsParams[wordsMatchType]=full&statisticsParams[wordsOr]=1&statisticsParams[date][min]=2014-10-09&statisticsParams[date][max]=2014-10-09&statisticsParams[count]=30&statisticsParams[candidates]=0&statisticsParams[count_from_segment]=0&statisticsParams[count_unique_items]=0&statisticsParams[term_frequency]=&statisticsParams[chain_max_length]=3&searchParams[query][value]=&searchParams[terms][value]=&searchParams[terms][withOutValue]=0&searchParams[summary][value]=$chain&searchParams[summary][withOutValue]=0&searchParams[labels][value]=&searchParams[ids][value]=&searchParams[date][min]=2014-10-09&searchParams[date][max]=2014-10-10&searchParams[rank][min]=0&searchParams[rank][max]=50&searchParams[count][value]=100&searchParams[sort][value]=delta_index&searchParams[group][field]=trends&searchParams[group][count]=2&searchParams[itype][value]=documents/document&searchParams[term_frequency]=&searchParams[detect_trends]=&searchParams[analyzed][value]=&searchParams[exclude_similar][value]=0&extractionParams[count]=30"; parse_str($str, $output); print_r($output);
based on JJJO2
Output for 5.0.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: chain in /in/p10El on line 2 Array ( [statisticsParams] => Array ( [words] => [exclude_search_trends] => 1 [wordsMatchType] => full [wordsOr] => 1 [date] => Array ( [min] => 2014-10-09 [max] => 2014-10-09 ) [count] => 30 [candidates] => 0 [count_from_segment] => 0 [count_unique_items] => 0 [term_frequency] => [chain_max_length] => 3 ) [searchParams] => Array ( [query] => Array ( [value] => ) [terms] => Array ( [value] => [withOutValue] => 0 ) [summary] => Array ( [value] => [withOutValue] => 0 ) [labels] => Array ( [value] => ) [ids] => Array ( [value] => ) [date] => Array ( [min] => 2014-10-09 [max] => 2014-10-10 ) [rank] => Array ( [min] => 0 [max] => 50 ) [count] => Array ( [value] => 100 ) [sort] => Array ( [value] => delta_index ) [group] => Array ( [field] => trends [count] => 2 ) [itype] => Array ( [value] => documents/document ) [term_frequency] => [detect_trends] => [analyzed] => Array ( [value] => ) [exclude_similar] => Array ( [value] => 0 ) ) [extractionParams] => Array ( [count] => 30 ) )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: chain in /in/p10El on line 2 Array ( [statisticsParams] => Array ( [words] => [exclude_search_trends] => 1 [wordsMatchType] => full [wordsOr] => 1 [date] => Array ( [min] => 2014-10-09 [max] => 2014-10-09 ) [count] => 30 [candidates] => 0 [count_from_segment] => 0 [count_unique_items] => 0 [term_frequency] => [chain_max_length] => 3 ) [searchParams] => Array ( [query] => Array ( [value] => ) [terms] => Array ( [value] => [withOutValue] => 0 ) [summary] => Array ( [value] => [withOutValue] => 0 ) [labels] => Array ( [value] => ) [ids] => Array ( [value] => ) [date] => Array ( [min] => 2014-10-09 [max] => 2014-10-10 ) [rank] => Array ( [min] => 0 [max] => 50 ) [count] => Array ( [value] => 100 ) [sort] => Array ( [value] => delta_index ) [group] => Array ( [field] => trends [count] => 2 ) [itype] => Array ( [value] => documents/document ) [term_frequency] => [detect_trends] => [analyzed] => Array ( [value] => ) [exclude_similar] => Array ( [value] => 0 ) ) [extractionParams] => Array ( [count] => 30 ) )