3v4l.org

run code in 500+ PHP versions simultaneously
<?php echo "PHP:\n"; // echo "1: \", "\n"; - syntax error echo "2: \\", "\n"; // outputs \ // echo "3: \\\", "\n"; - syntax error echo "4: \\\\", "\n"; // outputs \\ // echo "5: \\\\\", "\n"; - syntax error echo "6: \\\\\\", "\n"; // outputs \\\ // echo "7: \\\\\\\", "\n"; - syntax error echo "8: \\\\\\\\", "\n"; // outputs \\\\ echo "\nPHP + PCRE:\n"; // skipping odd counts because they're all syntax errors echo "2: ", preg_replace('/^/', '\\', ""), "\n"; // PCRE receives \ and allows it as a lone \ -> output \ echo "4: ", preg_replace('/^/', '\\\\', ""), "\n"; // PCRE receives \\ and interprets it as \ -> output \ echo "6: ", preg_replace('/^/', '\\\\\\', ""), "\n"; // PCRE receives \\\ and interprets it as \ + lone \ -> output \\ echo "8: ", preg_replace('/^/', '\\\\\\\\', ""), "\n"; // PCRE receives \\\\ and interprets it as \\ -> output \\
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Sjn85
function name:  (null)
number of ops:  31
compiled vars:  none
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ECHO                                                         'PHP%3A%0A'
    5     1        ECHO                                                         '2%3A+%5C'
          2        ECHO                                                         '%0A'
    7     3        ECHO                                                         '4%3A+%5C%5C'
          4        ECHO                                                         '%0A'
    9     5        ECHO                                                         '6%3A+%5C%5C%5C'
          6        ECHO                                                         '%0A'
   11     7        ECHO                                                         '8%3A+%5C%5C%5C%5C'
          8        ECHO                                                         '%0A'
   13     9        ECHO                                                         '%0APHP+%2B+PCRE%3A%0A'
   15    10        ECHO                                                         '2%3A+'
         11        FRAMELESS_ICALL_3                preg_replace        ~0      '%2F%5E%2F', '%5C'
         12        OP_DATA                                                      ''
         13        ECHO                                                         ~0
         14        ECHO                                                         '%0A'
   16    15        ECHO                                                         '4%3A+'
         16        FRAMELESS_ICALL_3                preg_replace        ~1      '%2F%5E%2F', '%5C%5C'
         17        OP_DATA                                                      ''
         18        ECHO                                                         ~1
         19        ECHO                                                         '%0A'
   17    20        ECHO                                                         '6%3A+'
         21        FRAMELESS_ICALL_3                preg_replace        ~2      '%2F%5E%2F', '%5C%5C%5C'
         22        OP_DATA                                                      ''
         23        ECHO                                                         ~2
         24        ECHO                                                         '%0A'
   18    25        ECHO                                                         '8%3A+'
         26        FRAMELESS_ICALL_3                preg_replace        ~3      '%2F%5E%2F', '%5C%5C%5C%5C'
         27        OP_DATA                                                      ''
         28        ECHO                                                         ~3
         29        ECHO                                                         '%0A'
         30      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


preferences:
155.17 ms | 2110 KiB | 13 Q