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<?php $str = '/block/2/page/2/block/3/page/4'; var_export( preg_split('~(?=/block/)~', $str, 0, PREG_SPLIT_NO_EMPTY) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/jMv1Q
function name:  (null)
number of ops:  11
compiled vars:  !0 = $str
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%2Fblock%2F2%2Fpage%2F2%2Fblock%2F3%2Fpage%2F4'
    5     1        INIT_FCALL                                               'var_export'
    6     2        INIT_FCALL                                               'preg_split'
          3        SEND_VAL                                                 '%7E%28%3F%3D%2Fblock%2F%29%7E'
          4        SEND_VAR                                                 !0
          5        SEND_VAL                                                 0
          6        SEND_VAL                                                 1
          7        DO_ICALL                                         $2      
          8        SEND_VAR                                                 $2
    5     9        DO_ICALL                                                 
    7    10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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