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run code in 200+ php & hhvm versions
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<?php $argv[1] = '-040.010'; $argv[1] = '-0000100.123400000'; echo strlen((explode('.',$t=trim('-'==($_=$argv[1])[0]?$n=$_=trim($_,'-'):$_,0)))[1]).($t!==$_?($n?' -':' ').$t:'');
based on Z90sW
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 12, Position 2 = 20
Branch analysis from position: 12
1 jumps found. (Code = 42) Position 1 = 21
Branch analysis from position: 21
2 jumps found. (Code = 43) Position 1 = 31, Position 2 = 38
Branch analysis from position: 31
2 jumps found. (Code = 43) Position 1 = 32, Position 2 = 34
Branch analysis from position: 32
1 jumps found. (Code = 42) Position 1 = 35
Branch analysis from position: 35
1 jumps found. (Code = 42) Position 1 = 39
Branch analysis from position: 39
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 34
1 jumps found. (Code = 42) Position 1 = 39
Branch analysis from position: 39
Branch analysis from position: 38
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 20
2 jumps found. (Code = 43) Position 1 = 31, Position 2 = 38
Branch analysis from position: 31
Branch analysis from position: 38
filename:       /in/1fFHI
function name:  (null)
number of ops:  42
compiled vars:  !0 = $argv, !1 = $t, !2 = $_, !3 = $n
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN_DIM                                               !0, 1
         1        OP_DATA                                                  '-040.010'
   4     2        ASSIGN_DIM                                               !0, 1
         3        OP_DATA                                                  '-0000100.123400000'
   6     4        INIT_FCALL                                               'explode'
         5        SEND_VAL                                                 '.'
         6        INIT_FCALL                                               'trim'
         7        FETCH_DIM_R                                      $6      !0, 1
         8        ASSIGN                                           $7      !2, $6
         9        FETCH_DIM_R                                      $8      $7, 0
        10        IS_EQUAL                                         ~9      '-', $8
        11      > JMPZ                                                     ~9, ->20
        12    >   INIT_FCALL                                               'trim'
        13        SEND_VAR                                                 !2
        14        SEND_VAL                                                 '-'
        15        DO_ICALL                                         $10     
        16        ASSIGN                                           $11     !2, $10
        17        ASSIGN                                           $12     !3, $11
        18        QM_ASSIGN                                        ~13     $12
        19      > JMP                                                      ->21
        20    >   QM_ASSIGN                                        ~13     !2
        21    >   SEND_VAL                                                 ~13
        22        SEND_VAL                                                 0
        23        DO_ICALL                                         $14     
        24        ASSIGN                                           $15     !1, $14
        25        SEND_VAR                                                 $15
        26        DO_ICALL                                         $16     
        27        FETCH_DIM_R                                      $17     $16, 1
        28        STRLEN                                           ~18     $17
        29        IS_NOT_IDENTICAL                                 ~19     !1, !2
        30      > JMPZ                                                     ~19, ->38
        31    > > JMPZ                                                     !3, ->34
        32    >   QM_ASSIGN                                        ~20     '+-'
        33      > JMP                                                      ->35
        34    >   QM_ASSIGN                                        ~20     '+'
        35    >   CONCAT                                           ~21     ~20, !1
        36        QM_ASSIGN                                        ~22     ~21
        37      > JMP                                                      ->39
        38    >   QM_ASSIGN                                        ~22     ''
        39    >   CONCAT                                           ~23     ~18, ~22
        40        ECHO                                                     ~23
        41      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0