06-13-2018
PN is a shell variable; short for path name.
Please make sure to test in a sandbox environment; You may want to add decent error checking, too!
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LEARN ABOUT PHP
runkit_sandbox_parent
RUNKIT_SANDBOX_PARENT(3) 1 RUNKIT_SANDBOX_PARENT(3)
Runkit_Sandbox_Parent - Runkit Anti-Sandbox Class
SYNOPSIS
void Runkit_Sandbox_Parent::__construct (void )
DESCRIPTION
Instantiating the Runkit_Sandbox_Parent class from within a sandbox environment created from the Runkit_Sandbox class provides some (con-
trolled) means for a sandbox child to access its parent.
Note
Sandbox support (required for runkit_lint(3), runkit_lint_file(3), and the Runkit_Sandbox class) is only available as of PHP 5.1.0
or specially patched versions of PHP 5.0, and requires that thread safety be enabled. See the README file included in the runkit
package for more information.
In order for any of the Runkit_Sandbox_Parent features to function. Support must be enabled on a per-sandbox basis by enabling the par-
ent_access flag from the parent's context.
Example #1
Working with variables in a sandbox
<?php
$sandbox = new Runkit_Sandbox();
$sandbox['parent_access'] = true;
?>
ACCESSING THE PARENT'S VARIABLES
Just as with sandbox variable access, a sandbox parent's variables may be read from and written to as properties of the Runkit_Sand-
box_Parent class. Read access to parental variables may be enabled with the parent_read setting (in addition to the base parent_access set-
ting). Write access, in turn, is enabled through the parent_write setting.
Unlike sandbox child variable access, the variable scope is not limited to globals only. By setting the parent_scope setting to an appro-
priate integer value, other scopes in the active call stack may be inspected instead. A value of 0 (Default) will direct variable access at
the global scope. 1 will point variable access at whatever variable scope was active at the time the current block of sandbox code was exe-
cuted. Higher values progress back through the functions that called the functions that led to the sandbox executing code that tried to
access its own parent's variables.
Example #2
Accessing parental variables
<?php
$php = new Runkit_Sandbox();
$php['parent_access'] = true;
$php['parent_read'] = true;
$test = "Global";
$php->eval('$PARENT = new Runkit_Sandbox_Parent;');
$php['parent_scope'] = 0;
one();
$php['parent_scope'] = 1;
one();
$php['parent_scope'] = 2;
one();
$php['parent_scope'] = 3;
one();
$php['parent_scope'] = 4;
one();
$php['parent_scope'] = 5;
one();
function one() {
$test = "one()";
two();
}
function two() {
$test = "two()";
three();
}
function three() {
$test = "three()";
$GLOBALS['php']->eval('var_dump($PARENT->test);');
}
?>
The above example will output:
string(6) "Global"
string(7) "three()"
string(5) "two()"
string(5) "one()"
string(6) "Global"
string(6) "Global"
CALLING THE PARENT'S FUNCTIONS
Just as with sandbox access, a sandbox may access its parents functions providing that the proper settings have been enabled. Enabling
parent_call will allow the sandbox to call all functions available to the parent scope. Language constructs are each controlled by their
own setting: print(3) and echo(3) are enabled with parent_echo. die(3) and exit(3) are enabled with parent_die. eval(3) is enabled with
parent_eval while include(3), include_once(3), require(3), and require_once(3) are enabled through parent_include.
PHP Documentation Group RUNKIT_SANDBOX_PARENT(3)