3v4l.org

run code in 500+ PHP versions simultaneously
<?php function foo(&$obj) { return $obj; } $o = "abc"; // No errors foo($o); call_user_func('foo', $o); call_user_func('foo', [$o]); $a[] = "abc"; $a[] = "abc"; $a[] = "abc"; // Warning: Parameter 1 to foo() expected to be a reference, value given in call_user_func('foo', array_slice($a, 0, 1));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/WMMQa
function name:  (null)
number of ops:  26
compiled vars:  !0 = $o, !1 = $a
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    7     0  E >   ASSIGN                                                       !0, 'abc'
    9     1        INIT_FCALL                                                   'foo'
          2        SEND_REF                                                     !0
          3        DO_FCALL                                          0          
   10     4        INIT_FCALL                                                   'foo'
          5        SEND_USER                                                    !0
          6        DO_FCALL                                          0          
   11     7        INIT_FCALL                                                   'foo'
          8        INIT_ARRAY                                           ~5      !0
          9        SEND_USER                                                    ~5
         10        DO_FCALL                                          0          
   14    11        ASSIGN_DIM                                                   !1
         12        OP_DATA                                                      'abc'
   15    13        ASSIGN_DIM                                                   !1
         14        OP_DATA                                                      'abc'
   16    15        ASSIGN_DIM                                                   !1
         16        OP_DATA                                                      'abc'
   18    17        INIT_FCALL                                                   'foo'
         18        INIT_FCALL                                                   'array_slice'
         19        SEND_VAR                                                     !1
         20        SEND_VAL                                                     0
         21        SEND_VAL                                                     1
         22        DO_ICALL                                             $10     
         23        SEND_USER                                                    $10
         24        DO_FCALL                                          0          
         25      > RETURN                                                       1

Function foo:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/WMMQa
function name:  foo
number of ops:  3
compiled vars:  !0 = $obj
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   RECV                                                 !0      
    4     1      > RETURN                                                       !0
    5     2*     > RETURN                                                       null

End of function foo

Generated using Vulcan Logic Dumper, using php 8.5.0


preferences:
168.46 ms | 2183 KiB | 18 Q