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<?php var_dump((bool)strtotime('t')); var_dump(strtotime('t'));
based on TlcqK
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/KFteZ
function name:  (null)
number of ops:  14
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL                                               'strtotime'
         2        SEND_VAL                                                 't'
         3        DO_ICALL                                         $0      
         4        CAST                                         13  ~1      $0
         5        SEND_VAL                                                 ~1
         6        DO_ICALL                                                 
   5     7        INIT_FCALL                                               'var_dump'
         8        INIT_FCALL                                               'strtotime'
         9        SEND_VAL                                                 't'
        10        DO_ICALL                                         $3      
        11        SEND_VAR                                                 $3
        12        DO_ICALL                                                 
        13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0