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Bugs & Features
<?php $str1= '082307'; echo substr(chunk_split($str1, 2, ':')); ?> - See more at: http://www.w3resource.com/php-exercises/php-string-exercises.php#sthash.bzfnf2JW.dpuf
based on B5Rc7
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/5l9VT
function name:  (null)
number of ops:  12
compiled vars:  !0 = $str1
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ASSIGN                                                   !0, '082307'
   3     1        INIT_FCALL                                               'substr'
         2        INIT_FCALL                                               'chunk_split'
         3        SEND_VAR                                                 !0
         4        SEND_VAL                                                 2
         5        SEND_VAL                                                 '%3A'
         6        DO_ICALL                                         $2      
         7        SEND_VAR                                                 $2
         8        DO_ICALL                                         $3      
         9        ECHO                                                     $3
   5    10        ECHO                                                     '++%0A-+See+more+at%3A+http%3A%2F%2Fwww.w3resource.com%2Fphp-exercises%2Fphp-string-exercises.php%23sthash.bzfnf2JW.dpuf'
        11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.1.0