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<?php $var = (float)1; var_dump( $var ); // float 1 var_dump( acos($var) ); // float 0 $lat2 = 56.6404468; $lon2 = 22.4747625; $lat1 = 56.6404468; $lon1 = 22.4747622; $theta = $lon1 - $lon2; $var = sin( deg2rad( $lat1 ) ) * sin( deg2rad( $lat2 ) ) + cos( deg2rad( $lat1 ) ) * cos( deg2rad( $lat2 ) ) * cos( deg2rad( $theta ) ); var_dump( $var ); // float 1 var_dump( acos( $var ) ); // float NAN
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/eFYIN
function name:  (null)
number of ops:  62
compiled vars:  !0 = $var, !1 = $lat2, !2 = $lon2, !3 = $lat1, !4 = $lon1, !5 = $theta
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   CAST                                          5  ~6      1
          1        ASSIGN                                                   !0, ~6
    4     2        INIT_FCALL                                               'var_dump'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                                 
    5     5        INIT_FCALL                                               'var_dump'
          6        INIT_FCALL                                               'acos'
          7        SEND_VAR                                                 !0
          8        DO_ICALL                                         $9      
          9        SEND_VAR                                                 $9
         10        DO_ICALL                                                 
    7    11        ASSIGN                                                   !1, 56.6404
    8    12        ASSIGN                                                   !2, 22.4748
    9    13        ASSIGN                                                   !3, 56.6404
   10    14        ASSIGN                                                   !4, 22.4748
   11    15        SUB                                              ~15     !4, !2
         16        ASSIGN                                                   !5, ~15
   12    17        INIT_FCALL                                               'sin'
         18        INIT_FCALL                                               'deg2rad'
         19        SEND_VAR                                                 !3
         20        DO_ICALL                                         $17     
         21        SEND_VAR                                                 $17
         22        DO_ICALL                                         $18     
         23        INIT_FCALL                                               'sin'
         24        INIT_FCALL                                               'deg2rad'
         25        SEND_VAR                                                 !1
         26        DO_ICALL                                         $19     
         27        SEND_VAR                                                 $19
         28        DO_ICALL                                         $20     
         29        MUL                                              ~21     $18, $20
         30        INIT_FCALL                                               'cos'
         31        INIT_FCALL                                               'deg2rad'
         32        SEND_VAR                                                 !3
         33        DO_ICALL                                         $22     
         34        SEND_VAR                                                 $22
         35        DO_ICALL                                         $23     
         36        INIT_FCALL                                               'cos'
         37        INIT_FCALL                                               'deg2rad'
         38        SEND_VAR                                                 !1
         39        DO_ICALL                                         $24     
         40        SEND_VAR                                                 $24
         41        DO_ICALL                                         $25     
         42        MUL                                              ~26     $23, $25
         43        INIT_FCALL                                               'cos'
         44        INIT_FCALL                                               'deg2rad'
         45        SEND_VAR                                                 !5
         46        DO_ICALL                                         $27     
         47        SEND_VAR                                                 $27
         48        DO_ICALL                                         $28     
         49        MUL                                              ~29     $28, ~26
         50        ADD                                              ~30     ~21, ~29
         51        ASSIGN                                                   !0, ~30
   13    52        INIT_FCALL                                               'var_dump'
         53        SEND_VAR                                                 !0
         54        DO_ICALL                                                 
   14    55        INIT_FCALL                                               'var_dump'
         56        INIT_FCALL                                               'acos'
         57        SEND_VAR                                                 !0
         58        DO_ICALL                                         $33     
         59        SEND_VAR                                                 $33
         60        DO_ICALL                                                 
         61      > RETURN                                                   1

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