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<?php $html = <<<HTML <img src="docs/relative/url/img.jpg" /> <img src="/docs/relative/url/img.jpg" /> <img src="https://docs/relative/url/img.jpg" /> <img src="http://docs/relative/url/img.jpg" /> HTML; $base = 'https://example.com/'; echo preg_replace( '~ src="(?!http)\K/?~', $base, $html );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/msYZM
function name:  (null)
number of ops:  6
compiled vars:  !0 = $html, !1 = $base
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                       !0, '%3Cimg+src%3D%22docs%2Frelative%2Furl%2Fimg.jpg%22+%2F%3E%0A%3Cimg+src%3D%22%2Fdocs%2Frelative%2Furl%2Fimg.jpg%22+%2F%3E%0A%3Cimg+src%3D%22https%3A%2F%2Fdocs%2Frelative%2Furl%2Fimg.jpg%22+%2F%3E%0A%3Cimg+src%3D%22http%3A%2F%2Fdocs%2Frelative%2Furl%2Fimg.jpg%22+%2F%3E'
    9     1        ASSIGN                                                       !1, 'https%3A%2F%2Fexample.com%2F'
   11     2        FRAMELESS_ICALL_3                preg_replace        ~4      '%7E+src%3D%22%28%3F%21http%29%5CK%2F%3F%7E', !1
   14     3        OP_DATA                                                      !0
          4        ECHO                                                         ~4
   15     5      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


preferences:
157.4 ms | 1984 KiB | 13 Q