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<?php function foo(bool $b) {} foo('foo'); var_dump('foo' == (bool) 'foo');
based on 2d6Nv
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/Z5OMI
function name:  (null)
number of ops:  10
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   NOP                                                      
   5     1        INIT_FCALL                                               'foo'
         2        SEND_VAL                                                 'foo'
         3        DO_FCALL                                      0          
   7     4        INIT_FCALL                                               'var_dump'
         5        CAST                                         13  ~1      'foo'
         6        IS_EQUAL                                         ~2      'foo', ~1
         7        SEND_VAL                                                 ~2
         8        DO_ICALL                                                 
         9      > RETURN                                                   1

Function foo:
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/Z5OMI
function name:  foo
number of ops:  2
compiled vars:  !0 = $b
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   RECV                                             !0      
         1      > RETURN                                                   null

End of function foo

Generated using Vulcan Logic Dumper, using php 7.3.0