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<?php function get_variables($code) { // get all the tokens $tokens = token_get_all("<?php $code ?>"); // filter out non-variables $tokens = array_filter($tokens, function ($t) { return $t[0] == T_VARIABLE; }); // return the variable names return array_column($tokens, 1); } print_r(get_variables('$isTrue ? $a : $b')); print_r(get_variables('$a=$b * ($c + 1)'));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/5mRCq
function name:  (null)
number of ops:  13
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   12     0  E >   INIT_FCALL                                               'print_r'
          1        INIT_FCALL                                               'get_variables'
          2        SEND_VAL                                                 '%24isTrue+%3F+%24a+%3A+%24b'
          3        DO_FCALL                                      0  $0      
          4        SEND_VAR                                                 $0
          5        DO_ICALL                                                 
   13     6        INIT_FCALL                                               'print_r'
          7        INIT_FCALL                                               'get_variables'
          8        SEND_VAL                                                 '%24a%3D%24b+%2A+%28%24c+%2B+1%29'
          9        DO_FCALL                                      0  $2      
         10        SEND_VAR                                                 $2
         11        DO_ICALL                                                 
         12      > RETURN                                                   1

Function get_variables:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/5mRCq
function name:  get_variables
number of ops:  20
compiled vars:  !0 = $code, !1 = $tokens
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
    5     1        INIT_FCALL                                               'token_get_all'
          2        ROPE_INIT                                     3  ~3      '%3C%3Fphp+'
          3        ROPE_ADD                                      1  ~3      ~3, !0
          4        ROPE_END                                      2  ~2      ~3, '+%3F%3E'
          5        SEND_VAL                                                 ~2
          6        DO_ICALL                                         $5      
          7        ASSIGN                                                   !1, $5
    7     8        INIT_FCALL                                               'array_filter'
          9        SEND_VAR                                                 !1
         10        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2F5mRCq%3A7%240'
         11        SEND_VAL                                                 ~7
         12        DO_ICALL                                         $8      
         13        ASSIGN                                                   !1, $8
    9    14        INIT_FCALL                                               'array_column'
         15        SEND_VAR                                                 !1
         16        SEND_VAL                                                 1
         17        DO_ICALL                                         $10     
         18      > RETURN                                                   $10
   10    19*     > RETURN                                                   null

End of function get_variables

Function %00%7Bclosure%7D%2Fin%2F5mRCq%3A7%240:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/5mRCq
function name:  {closure}
number of ops:  5
compiled vars:  !0 = $t
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    7     0  E >   RECV                                             !0      
          1        FETCH_DIM_R                                      ~1      !0, 0
          2        IS_EQUAL                                         ~2      ~1, 315
          3      > RETURN                                                   ~2
          4*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2F5mRCq%3A7%240

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