3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = 'III.OOO.OOO.OOO.S'; $search = 'XXX'; $replace = 'B'; //replace ONLY FIRST occurance of "OOO" with "B" echo substr_replace($string,$replace,0,strlen($search)); //$string => B.OOO.OOO.S echo "\n---\n"; //replace ONLY LAST occurance of "OOOO" with "B" echo substr_replace($string,$replace,strrpos($string,$search),strlen($search)); //$string => OOO.OOO.B.S echo "\n---\n"; //replace ONLY LAST occurance of "OOOO" with "B" echo strrev(implode(strrev($replace),explode(strrev($search),strrev($string),2))); //$string => OOO.OOO.B.S
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/HmEml
function name:  (null)
number of ops:  48
compiled vars:  !0 = $string, !1 = $search, !2 = $replace
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'III.OOO.OOO.OOO.S'
    3     1        ASSIGN                                                   !1, 'XXX'
    4     2        ASSIGN                                                   !2, 'B'
    7     3        INIT_FCALL                                               'substr_replace'
          4        SEND_VAR                                                 !0
          5        SEND_VAR                                                 !2
          6        SEND_VAL                                                 0
          7        STRLEN                                           ~6      !1
          8        SEND_VAL                                                 ~6
          9        DO_ICALL                                         $7      
         10        ECHO                                                     $7
   10    11        ECHO                                                     '%0A---%0A'
   13    12        INIT_FCALL                                               'substr_replace'
         13        SEND_VAR                                                 !0
         14        SEND_VAR                                                 !2
         15        INIT_FCALL                                               'strrpos'
         16        SEND_VAR                                                 !0
         17        SEND_VAR                                                 !1
         18        DO_ICALL                                         $8      
         19        SEND_VAR                                                 $8
         20        STRLEN                                           ~9      !1
         21        SEND_VAL                                                 ~9
         22        DO_ICALL                                         $10     
         23        ECHO                                                     $10
   16    24        ECHO                                                     '%0A---%0A'
   19    25        INIT_FCALL                                               'strrev'
         26        INIT_FCALL                                               'implode'
         27        INIT_FCALL                                               'strrev'
         28        SEND_VAR                                                 !2
         29        DO_ICALL                                         $11     
         30        SEND_VAR                                                 $11
         31        INIT_FCALL                                               'explode'
         32        INIT_FCALL                                               'strrev'
         33        SEND_VAR                                                 !1
         34        DO_ICALL                                         $12     
         35        SEND_VAR                                                 $12
         36        INIT_FCALL                                               'strrev'
         37        SEND_VAR                                                 !0
         38        DO_ICALL                                         $13     
         39        SEND_VAR                                                 $13
         40        SEND_VAL                                                 2
         41        DO_ICALL                                         $14     
         42        SEND_VAR                                                 $14
         43        DO_ICALL                                         $15     
         44        SEND_VAR                                                 $15
         45        DO_ICALL                                         $16     
         46        ECHO                                                     $16
   20    47      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
183.6 ms | 1400 KiB | 23 Q