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<?php function doFoo(){ echo 'hi!'; } $callable = 'doFoo'; var_dump( is_callable( $callable ) ); var_dump( is_string( $callable ) ); function doBar( callable $cb ){ $cb(); } doBar( $callable );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/u9cST
function name:  (null)
number of ops:  15
compiled vars:  !0 = $callable
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   ASSIGN                                                   !0, 'doFoo'
    6     1        INIT_FCALL                                               'var_dump'
          2        INIT_FCALL                                               'is_callable'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                         $2      
          5        SEND_VAR                                                 $2
          6        DO_ICALL                                                 
    7     7        INIT_FCALL                                               'var_dump'
          8        TYPE_CHECK                                   64  ~4      !0
          9        SEND_VAL                                                 ~4
         10        DO_ICALL                                                 
   13    11        INIT_FCALL                                               'dobar'
         12        SEND_VAR                                                 !0
         13        DO_FCALL                                      0          
         14      > RETURN                                                   1

Function dofoo:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/u9cST
function name:  doFoo
number of ops:  2
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ECHO                                                     'hi%21'
          1      > RETURN                                                   null

End of function dofoo

Function dobar:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/u9cST
function name:  doBar
number of ops:  4
compiled vars:  !0 = $cb
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    9     0  E >   RECV                                             !0      
   10     1        INIT_DYNAMIC_CALL                                        !0
          2        DO_FCALL                                      0          
   11     3      > RETURN                                                   null

End of function dobar

Generated using Vulcan Logic Dumper, using php 8.0.0


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