3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = substr('abcdef', 0, -2); $y = substr($x, 0, -2);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Neaed
function name:  (null)
number of ops:  13
compiled vars:  !0 = $x, !1 = $y
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'substr'
          1        SEND_VAL                                                 'abcdef'
          2        SEND_VAL                                                 0
          3        SEND_VAL                                                 -2
          4        DO_ICALL                                         $2      
          5        ASSIGN                                                   !0, $2
    4     6        INIT_FCALL                                               'substr'
          7        SEND_VAR                                                 !0
          8        SEND_VAL                                                 0
          9        SEND_VAL                                                 -2
         10        DO_ICALL                                         $4      
         11        ASSIGN                                                   !1, $4
         12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
162.85 ms | 1394 KiB | 15 Q