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<?php print_r(preg_split("~@(?>if|else(?>if)?)\s*(?>\([^()]*+\)\s*)?\[(?:[^][@]*+(?>\\.[^][@]*)*(@+(?!(?>if|else(?>if)?)))?|(?R))*\]\K\s*~", "@if(param1>=7) [ something here @if(param1>9)[ nested statement ] ] @elseif(param2==true) [ 2st condition true ] @else [ default condition ]", -1, PREG_SPLIT_NO_EMPTY));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/LqpZF
function name:  (null)
number of ops:  10
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'print_r'
          1        INIT_FCALL                                               'preg_split'
          2        SEND_VAL                                                 '%7E%40%28%3F%3Eif%7Celse%28%3F%3Eif%29%3F%29%5Cs%2A%28%3F%3E%5C%28%5B%5E%28%29%5D%2A%2B%5C%29%5Cs%2A%29%3F%5C%5B%28%3F%3A%5B%5E%5D%5B%40%5D%2A%2B%28%3F%3E%5C.%5B%5E%5D%5B%40%5D%2A%29%2A%28%40%2B%28%3F%21%28%3F%3Eif%7Celse%28%3F%3Eif%29%3F%29%29%29%3F%7C%28%3FR%29%29%2A%5C%5D%5CK%5Cs%2A%7E'
          3        SEND_VAL                                                 '%40if%28param1%3E%3D7%29+%5B+something+here+%40if%28param1%3E9%29%5B+nested+statement+%5D+%5D+%40elseif%28param2%3D%3Dtrue%29+%5B+2st+condition+true+%5D+%40else+%5B+default+condition+%5D'
          4        SEND_VAL                                                 -1
          5        SEND_VAL                                                 1
          6        DO_ICALL                                         $0      
          7        SEND_VAR                                                 $0
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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