foreach - php array : how to access the "$key-1" in an associative array? -

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i got existing foreach set of conditions , i'd keep , add end date beginning date of line before + 1 day

how access "$line-1" do:

foreach($tab $line){        if line before $line[beginning_date] exists            $line[end_date]=   line before $line[beginning_date] value +1  }

good enough?

$thelinebefore = null; foreach($tab $line){        if line before $line[beginning_date] exists            $line[end_date]=   line before $line[beginning_date] value +1   $thelinebefore = $line;  }

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