To avoid getting the error message as in this previous question, I decided to change the class with __get() like this below,
class property
{
public function __get($name)
{
return isset($this->$name) ? $this->$name : new property;
}
}
class objectify
{
public function array_to_object($array = array(), $property_overloading = false)
{
# if $array is not an array, let's make it array with one value of former $array.
if (!is_array($array)) $array = array($array);
# Use property overloading to handle inaccessible properties, if overloading is set to be true.
# Else use std object.
if($property_overloading === true) $object = new property();
else $object = new stdClass();
foreach($array as $key => $value)
{
$key = (string) $key ;
$object->$key = is_array($value) ? self::array_to_object($value, $property_overloading) : $value;
}
return $object;
}
}
$object = new objectify();
$type = null;
$type = $object->array_to_object($type,true);
var_dump($type->a->b->c);
so I get this result in the end,
object(property)#3 (0) { }
but it is still not perfect. as my understanding, the above solution processes the object in a chain like this,
$type = object{}->object{}->object{}
so I wonder if I can find whether it is the last chain and it is empty then just output a null?
$type = object{}->object{}->NULL
is it possible with PHP?
EDIT:
I have thought of an idea which is to count how many times the property class has been instantiated,
class property
{
public static $counter = 0;
function __construct() {
self::$counter++;
}
public function __get($name)
{
if(isset($this->$name))
{
return $this->$name;
}
elseif(property::$counter < 3)
{
return new property;
}
else
{
return null;
}
}
}
but my only problem is how to make the number 3 dynamic. Any ideas?
Sounds like you're looking for a PHP version of Groovy's ?. operator: http://groovy.codehaus.org/Null+Object+Pattern
Afaik, you can't overload or create a new operator in PHP. You could perhaps simulate it by passing all of your nested calls to a function, and the function knows when to return null.
Edit: other options posted here - http://justafewlines.com/2009/10/groovys-operator-in-php-sort-of/
Related
It doesn't seem to work:
$ref = new ReflectionObject($obj);
if($ref->hasProperty('privateProperty')){
print_r($ref->getProperty('privateProperty'));
}
It gets into the IF loop, and then throws an error:
Property privateProperty does not exist
:|
$ref = new ReflectionProperty($obj, 'privateProperty') doesn't work either...
The documentation page lists a few constants, including IS_PRIVATE. How can I ever use that if I can't access a private property lol?
class A
{
private $b = 'c';
}
$obj = new A();
$r = new ReflectionObject($obj);
$p = $r->getProperty('b');
$p->setAccessible(true); // <--- you set the property to public before you read the value
var_dump($p->getValue($obj));
Please, note that accepted answer will not work if you need to get the value of a private property which comes from a parent class.
For this you can rely on getParentClass method of Reflection API.
Also, this is already solved in this micro-library.
More details in this blog post.
getProperty throws an exception, not an error. The significance is, you can handle it, and save yourself an if:
$ref = new ReflectionObject($obj);
$propName = "myProperty";
try {
$prop = $ref->getProperty($propName);
} catch (ReflectionException $ex) {
echo "property $propName does not exist";
//or echo the exception message: echo $ex->getMessage();
}
To get all private properties, use $ref->getProperties(ReflectionProperty::IS_PRIVATE);
In case you need it without reflection:
public function propertyReader(): Closure
{
return function &($object, $property) {
$value = &Closure::bind(function &() use ($property) {
return $this->$property;
}, $object, $object)->__invoke();
return $value;
};
}
and then just use it (in the same class) like this:
$object = new SomeObject();
$reader = $this->propertyReader();
$result = &$reader($object, 'some_property');
Without reflection, one can also do
class SomeHelperClass {
// Version 1
public static function getProperty1 (object $object, string $property) {
return Closure::bind(
function () use ($property) {
return $this->$property;
},
$object,
$object
)();
}
// Version 2
public static function getProperty2 (object $object, string $property) {
return (
function () use ($property) {
return $this->$property;
}
)->bindTo(
$object,
$object
)->__invoke();
}
}
and then something like
SomeHelperClass::getProperty1($object, $propertyName)
SomeHelperClass::getProperty2($object, $propertyName)
should work.
This is a simplified version of Nikola Stojiljković's answer
I would like to get/set a property of a property of a property (...) having the path. For example, if I have
$obj->a->b->c
I would like to get it with
get_property(["a", "b", "c"], $obj)
I've written this function for getting it and it works for array and object values but I need it for objects.
public static function get_value_by_path($index, $array) {
if (!$index || empty($index))
return NULL;
if (is_array($index)) {
if (count($index) > 1) {
if (is_array($array) && array_key_exists($index[0], $array)) {
return static::get_value_by_path(array_slice($index, 1), $array[$index[0]]);
}
if (is_object($array)) {
return static::get_value_by_path(array_slice($index, 1), $array->{$index[0]});
}
return NULL;
}
$index = $index[0];
}
if (is_array($array) && array_key_exists($index, $array))
return $array[$index];
if (is_object($array) && property_exists($array, $index)) return $array->$index;
return NULL;
}
My question is: is it possible to do this without recursion?
I haven't found similiar questions.
This function below will do it:
function get_property($propertyPath, $object)
{
foreach ($propertyPath as $propertyName) {
// basic protection against bad path
if (!property_exists($object,$property)) return NULL;
// get the property
$property = $object->{$propertyName};
// if it is not an object it has to be the end point
if (!is_object($property)) return $property;
// if it is an object replace current object
$object = $property;
}
return $object;
}
depending on what you exactly want to can build in some error code. You can use the get function if you want to set something like this:
function set_property($propertyPath, &$object, $value)
{
// pop off the last property
$lastProperty = array_pop($propertyPath);
// get the object to which the last property should belong
$targetObject = get_property($propertyPath,$object);
// and set it to value if it is valid
if (is_object($targetObject) && property_exists($targetObject,$lastProperty)) {
$targetObject->{$lastProperty} = $value;
}
}
I do however like recursion, and with it these functions could possibly be better.
I've been fooling with ArrayAccess and PHP's magic (__get, __set) for awhile now, and I'm stuck.
I'm trying to implement a class in which some properties, which are arrays, are read only. They will be set initially by the constructor, but should not be modifiable thereafter.
Using __get magic by reference, I can access array elements arbitrarily deep in the properties, and I was thinking I can throw exceptions when those properties are targeted via __set.
The problem is though, when I'm accessing the value of an array element, PHP is calling __get to return that part of the array by reference, and I have no knowledge of whether or not its a read or write action.
(The worst part is I knew this going in, but have been fooling with ArrayAccess as a possible workaround solution, given the properties were instances of an implemented object)
Simple example:
class Test{
public function &__get($key){
echo "[READ:{$key}]\n";
}
public function __set($key, $value){
echo "[WRITE:{$key}={$value}]\n";
}
}
$test = new Test;
$test->foo;
$test->foo = 'bar';
$test->foo['bar'];
$test->foo['bar'] = 'zip';
And the output:
[READ:foo]
[WRITE:foo=bar]
[READ:foo]
[READ:foo] // here's the problem
Realistically, I only need the value foo (as per my example) anyways, but I need to know it's a write action, not read.
I've already half accepted that this cannot be achieved, but I'm still hopeful. Does anyone have any idea how what I'm looking to accomplish can be done?
I was considering some possible workarounds with ArrayAccess, but so far as I can tell, I'll end up back at this spot, given I'm going to use the property notation that invokes __get.
Update: Another fun day with ArrayAccess.
(This is a different issue, but I suppose it works in. Posting just for kicks.)
class Mf_Params implements ArrayAccess{
private $_key = null;
private $_parent = null;
private $_data = array();
private $_temp = array();
public function __construct(Array $data = array(), $key = null, self $parent = null){
$this->_parent = $parent;
$this->_key = $key;
foreach($data as $key => $value){
$this->_data[$key] = is_array($value)
? new self($value, $key, $this)
: $value;
}
}
public function toArray(){
$array = array();
foreach($this->_data as $key => $value){
$array[$key] = $value instanceof self
? $value->toArray()
: $value;
}
return $array;
}
public function offsetGet($offset){
if(isset($this->_data[$offset])){
return $this->_data[$offset];
}
// if offset not exist return temp instance
return $this->_temp[$offset] = new self(array(), $offset, $this);
}
public function offsetSet($offset, $value){
$child = $this;
// copy temp instances to data after array reference chain
while(!is_null($parent = $child->_parent) && $parent->_temp[$child->_key] === $child){
$parent->_data[$child->_key] = $parent->_temp[$child->_key];
$child = $parent;
}
// drop temp
foreach($child->_temp as &$temp){
unset($temp);
}
if(is_null($offset)){
$this->_data[] = is_array($value)
? new self($value, null, $this)
: $value;
}else{
$this->_data[$offset] = is_array($value)
? new self($value, $offset, $this)
: $value;
}
}
public function offsetExists($offset){
return isset($this->_data[$offset]);
}
public function offsetUnset($offset){
unset($this->_data[$offset]);
}
}
You need to use a second class, implementing ArrayAccess, to use instead of your arrays. Then you will be able to control what is added to the array with the offsetSet() method:
class ReadOnlyArray implements ArrayAccess {
private $container = array();
public function __construct(array $array) {
$this->container = $array;
}
public function offsetSet($offset, $value) {
throw new Exception('Read-only');
}
public function offsetExists($offset) {
return isset($this->container[$offset]);
}
public function offsetUnset($offset) {
unset($this->container[$offset]);
}
public function offsetGet($offset) {
if (! array_key_exists($offset, $this->container)) {
throw new Exception('Undefined offset');
}
return $this->container[$offset];
}
}
You can then initialize your ReadOnlyArray with your original array:
$readOnlyArray = new ReadOnlyArray(array('foo', 'bar'));
You could not return by ref, which would solve the problem of changability, but would not allow changing of some values that are allowed to be changed.
Alternatively you need to wrap every returned array in ArrayAccess, too - and forbid write access there.
Is there such a function like in_array, but can be used on objects?
Nope, but you can cast the object to an array and pass it into in_array().
$obj = new stdClass;
$obj->one = 1;
var_dump(in_array(1, (array) $obj)); // bool(true)
That violates all kinds of OOP principles though. See my comment on your question and Aron's answer.
First of all, arrays and objects are quite different.
A PHP object can not be iterated through like an array, by default. A way to implement object iteration is to implement the Iterator interface.
Concerning your specific question, you probably want to take a look at the ArrayAccess interface:
class obj implements ArrayAccess {
private $container = array();
public function __construct() {
$this->container = array(
"one" => 1,
"two" => 2,
"three" => 3,
);
}
public function offsetSet($offset, $value) {
if (is_null($offset)) {
$this->container[] = $value;
} else {
$this->container[$offset] = $value;
}
}
public function offsetExists($offset) {
return isset($this->container[$offset]);
}
public function offsetUnset($offset) {
unset($this->container[$offset]);
}
public function offsetGet($offset) {
return isset($this->container[$offset]) ? $this->container[$offset] : null;
}
}
Now you can access your object like an array in the following manner:
$object = new obj();
var_dump(isset($obj['two'])); // exists!
var_dump(isset($obj['foo'])); // does not exist
Before you go crazy on this though, please consider why you are actually trying to do this and take a look at the examples at php.net.
Option 2: when you are simply trying to see if a property exists, you can use property_exists() for this:
class foo {
public $bar = 'baz';
}
$object = new foo();
var_dump(property_exists($object, 'bar')); // true
You could cast the object to an array:
$obj = new stdClass();
$obj->var = 'foobar';
in_array( 'foobar', (array)$obj ); // true
function in_object($needle, $haystack) {
return in_array($needle, get_object_vars($haystack));
}
It's unbelievable how all the people miss the point of the usefulness of an in_object PHP method! Here is what I came up with, it is very useful, and you will see why!
Here is a simple function I wrote which will check if a value can be found within an object.
<?php
// in_object method
// to check if a value in an object exists.
function in_object($value,$object) {
if (is_object($object)) {
foreach($object as $key => $item) {
if ($value==$item) return $key;
}
}
return false;
}
?>
This is very useful if an object has been created dynamically (especially from external code, which you don't control, as in an application-plugin, CMS, etc), and you don't know the object's properties.
The above function will return the property, so you will be able to use it in your code later on.
Here is a very good basic example of how useful this function is!
<?php
class My_Class {
function __construct($key, $value) {
$this->$key = $value;
// As you can see, this is a dynamic class, its properties and values can be unknown...
}
}
function in_object($value,$object) {
if (is_object($object)) {
foreach($object as $key => $item) {
if ($value==$item) return $key;
}
}
return false;
}
function manipulate_property($value,$object) {
if ($property = in_object($value,$object)) {
// value found. I can now use this property.
// I can simply echo'it (makes no sense, as I could instead simply echo "value")
echo "<br />I found the property holding this value: ".$object->$property;
// or (here comes the good part)
// change the property
$object->$property = "This is a changed value!";
echo "<br />I changed the value to: ".$object->$property;
// or return it for use in my program flow
return $property;
} else {
echo "Value NOT FOUND!<br />";
return false;
}
}
// imagine if some function creates the class conditionally...
if ( 1 == 1) {
$class = new My_Class("property","Unchanged Value");
} else {
$class = new My_Class("property","Some Other Value");
}
// now let's check if the value we want exists, and if yes, let's have some fun with it...
$property = manipulate_property("Unchanged Value",$class);
if ($property) {
$my_variable = $class->$property;
echo "<br />This is my variable now:".$my_variable;
} else $my_variable = $some_other_variable;
?>
Just run it to see for yourself!
I don't recommend it, because it's very bad practice but you can use get_object_vars.
Gets the accessible non-static properties of the given object according to scope.
There are other limitations you should refer to the documentation to see if it is suitable for you.
if(in_array('find me', get_object_vars($obj)))
This is the most efficient and correct solution. With some modifications it could be applied to check any data type present in any object.
if(gettype($object->var1->var2) == "string"){
echo "Present";
}
I have a class implementing ArrayAccess and I'm trying to get it to work with a multidimensional array. exists and get work. set and unset are giving me a problem though.
class ArrayTest implements ArrayAccess {
private $_arr = array(
'test' => array(
'bar' => 1,
'baz' => 2
)
);
public function offsetExists($name) {
return isset($this->_arr[$name]);
}
public function offsetSet($name, $value) {
$this->_arr[$name] = $value;
}
public function offsetGet($name) {
return $this->_arr[$name];
}
public function offsetUnset($name) {
unset($this->_arr[$name]);
}
}
$arrTest = new ArrayTest();
isset($arrTest['test']['bar']); // Returns TRUE
echo $arrTest['test']['baz']; // Echo's 2
unset($arrTest['test']['bar']); // Error
$arrTest['test']['bar'] = 5; // Error
I know $_arr could just be made public so you could access it directly, but for my implementation it's not desired and is private.
The last 2 lines throw an error: Notice: Indirect modification of overloaded element.
I know ArrayAccess just generally doesn't work with multidimensional arrays, but is there anyway around this or any somewhat clean implementation that will allow the desired functionality?
The best idea I could come up with is using a character as a separator and testing for it in set and unset and acting accordingly. Though this gets really ugly really fast if you're dealing with a variable depth.
Does anyone know why exists and get work so as to maybe copy over the functionality?
Thanks for any help anyone can offer.
The problem could be resolved by changing public function offsetGet($name) to public function &offsetGet($name) (by adding return by reference), but it will cause Fatal Error ("Declaration of ArrayTest::offsetGet() must be compatible with that of ArrayAccess::offsetGet()").
PHP authors screwed up with this class some time ago and now they won't change it in sake of backwards compatibility:
We found out that this is not solvable
without blowing up the interface and
creating a BC or providing an
additional interface to support
references and thereby creating an
internal nightmare - actually i don't
see a way we can make that work ever.
Thus we decided to enforce the
original design and disallow
references completley.
Edit: If you still need that functionality, I'd suggest using magic method instead (__get(), __set(), etc.), because __get() returns value by reference. This will change syntax to something like this:
$arrTest->test['bar'] = 5;
Not an ideal solution of course, but I can't think of a better one.
Update: This problem was fixed in PHP 5.3.4 and ArrayAccess now works as expected:
Starting with PHP 5.3.4, the prototype checks were relaxed and it's possible for implementations of this method to return by reference. This makes indirect modifications to the overloaded array dimensions of ArrayAccess objects possible.
This issue is actually solvable, entirely functional how it should be.
From a comment on the ArrayAccess documentation here:
<?php
// sanity and error checking omitted for brevity
// note: it's a good idea to implement arrayaccess + countable + an
// iterator interface (like iteratoraggregate) as a triplet
class RecursiveArrayAccess implements ArrayAccess {
private $data = array();
// necessary for deep copies
public function __clone() {
foreach ($this->data as $key => $value) if ($value instanceof self) $this[$key] = clone $value;
}
public function __construct(array $data = array()) {
foreach ($data as $key => $value) $this[$key] = $value;
}
public function offsetSet($offset, $data) {
if (is_array($data)) $data = new self($data);
if ($offset === null) { // don't forget this!
$this->data[] = $data;
} else {
$this->data[$offset] = $data;
}
}
public function toArray() {
$data = $this->data;
foreach ($data as $key => $value) if ($value instanceof self) $data[$key] = $value->toArray();
return $data;
}
// as normal
public function offsetGet($offset) { return $this->data[$offset]; }
public function offsetExists($offset) { return isset($this->data[$offset]); }
public function offsetUnset($offset) { unset($this->data); }
}
$a = new RecursiveArrayAccess();
$a[0] = array(1=>"foo", 2=>array(3=>"bar", 4=>array(5=>"bz")));
// oops. typo
$a[0][2][4][5] = "baz";
//var_dump($a);
//var_dump($a->toArray());
// isset and unset work too
//var_dump(isset($a[0][2][4][5])); // equivalent to $a[0][2][4]->offsetExists(5)
//unset($a[0][2][4][5]); // equivalent to $a[0][2][4]->offsetUnset(5);
// if __clone wasn't implemented then cloning would produce a shallow copy, and
$b = clone $a;
$b[0][2][4][5] = "xyzzy";
// would affect $a's data too
//echo $a[0][2][4][5]; // still "baz"
?>
You can then extend that class, like so:
<?php
class Example extends RecursiveArrayAccess {
function __construct($data = array()) {
parent::__construct($data);
}
}
$ex = new Example(array('foo' => array('bar' => 'baz')));
print_r($ex);
$ex['foo']['bar'] = 'pong';
print_r($ex);
?>
This will give you an object that can be treated like an array (mostly, see note in code), which supports multi-dimensional array set/get/unset.
EDIT: See the response of Alexander Konstantinov. I was thinking of the __get magic method, which is analogous, but was actually implemented correctly. So you cannot do that without an internal implementation of your class.
EDIT2: Internal implementation:
NOTE: You might argue this is purely masturbatory, but anyway here it goes:
static zend_object_handlers object_handlers;
static zend_object_value ce_create_object(zend_class_entry *class_type TSRMLS_DC)
{
zend_object_value zov;
zend_object *zobj;
zobj = emalloc(sizeof *zobj);
zend_object_std_init(zobj, class_type TSRMLS_CC);
zend_hash_copy(zobj->properties, &(class_type->default_properties),
(copy_ctor_func_t) zval_add_ref, NULL, sizeof(zval*));
zov.handle = zend_objects_store_put(zobj,
(zend_objects_store_dtor_t) zend_objects_destroy_object,
(zend_objects_free_object_storage_t) zend_objects_free_object_storage,
NULL TSRMLS_CC);
zov.handlers = &object_handlers;
return zov;
}
/* modification of zend_std_read_dimension */
zval *read_dimension(zval *object, zval *offset, int type TSRMLS_DC) /* {{{ */
{
zend_class_entry *ce = Z_OBJCE_P(object);
zval *retval;
void *dummy;
if (zend_hash_find(&ce->function_table, "offsetgetref",
sizeof("offsetgetref"), &dummy) == SUCCESS) {
if(offset == NULL) {
/* [] construct */
ALLOC_INIT_ZVAL(offset);
} else {
SEPARATE_ARG_IF_REF(offset);
}
zend_call_method_with_1_params(&object, ce, NULL, "offsetgetref",
&retval, offset);
zval_ptr_dtor(&offset);
if (!retval) {
if (!EG(exception)) {
/* ought to use php_error_docref* instead */
zend_error(E_ERROR,
"Undefined offset for object of type %s used as array",
ce->name);
}
return 0;
}
/* Undo PZVAL_LOCK() */
Z_DELREF_P(retval);
return retval;
} else {
zend_error(E_ERROR, "Cannot use object of type %s as array", ce->name);
return 0;
}
}
ZEND_MODULE_STARTUP_D(testext)
{
zend_class_entry ce;
zend_class_entry *ce_ptr;
memcpy(&object_handlers, zend_get_std_object_handlers(),
sizeof object_handlers);
object_handlers.read_dimension = read_dimension;
INIT_CLASS_ENTRY(ce, "TestClass", NULL);
ce_ptr = zend_register_internal_class(&ce TSRMLS_CC);
ce_ptr->create_object = ce_create_object;
return SUCCESS;
}
now this script:
<?php
class ArrayTest extends TestClass implements ArrayAccess {
private $_arr = array(
'test' => array(
'bar' => 1,
'baz' => 2
)
);
public function offsetExists($name) {
return isset($this->_arr[$name]);
}
public function offsetSet($name, $value) {
$this->_arr[$name] = $value;
}
public function offsetGet($name) {
throw new RuntimeException("This method should never be called");
}
public function &offsetGetRef($name) {
return $this->_arr[$name];
}
public function offsetUnset($name) {
unset($this->_arr[$name]);
}
}
$arrTest = new ArrayTest();
echo (isset($arrTest['test']['bar'])?"test/bar is set":"error") . "\n";
echo $arrTest['test']['baz']; // Echoes 2
echo "\n";
unset($arrTest['test']['baz']);
echo (isset($arrTest['test']['baz'])?"error":"test/baz is not set") . "\n";
$arrTest['test']['baz'] = 5;
echo $arrTest['test']['baz']; // Echoes 5
gives:
test/bar is set
2
test/baz is not set
5
ORIGINAL follows -- this is incorrect:
Your offsetGet implementation must return a reference for it to work.
public function &offsetGet($name) {
return $this->_arr[$name];
}
For the internal equivalent, see here.
Since there's no analogous to get_property_ptr_ptr, you ought to return a reference (in the sense of Z_ISREF) or a proxy object (see the get handler) in write-like contexts (types BP_VAR_W, BP_VAR_RW and BP_VAR_UNSET), though it's not mandatory. If read_dimension is being called in a write-like context such as in $val =& $obj['prop'], and you return neither a reference nor an object, the engine emit a notice. Obviously, returning a reference is not enough for those operations to work correctly, it is necessary that modifying the returned zval actually has some effect. Note that assignments such as $obj['key'] = &$a are still not possible – for that one would need the dimensions to actually be storable as zvals (which may or may not be the case) and two levels of indirection.
In sum, operations that involve writing or unseting a sub-dimension of sub-property call offsetGet, not offsetSet, offsetExists or offsetUnset.
Solution:
<?php
/**
* Cube PHP Framework
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* #author Dillen / Steffen
*/
namespace Library;
/**
* The application
*
* #package Library
*/
class ArrayObject implements \ArrayAccess
{
protected $_storage = array();
// necessary for deep copies
public function __clone()
{
foreach ($this->_storage as $key => $value)
{
if ($value instanceof self)
{
$this->_storage[$key] = clone $value;
}
}
}
public function __construct(array $_storage = array())
{
foreach ($_storage as $key => $value)
{
$this->_storage[$key] = $value;
}
}
public function offsetSet($offset, $_storage)
{
if (is_array($_storage))
{
$_storage = new self($_storage);
}
if ($offset === null)
{
$this->_storage[] = $_storage;
}
else
{
$this->_storage[$offset] = $_storage;
}
}
public function toArray()
{
$_storage = $this -> _storage;
foreach ($_storage as $key => $value)
{
if ($value instanceof self)
{
$_storage[$key] = $value -> toArray();
}
}
return $_storage;
}
// as normal
public function offsetGet($offset)
{
if (isset($this->_storage[$offset]))
{
return $this->_storage[$offset];
}
if (!isset($this->_storage[$offset]))
{
$this->_storage[$offset] = new self;
}
return $this->_storage[$offset];
}
public function offsetExists($offset)
{
return isset($this->_storage[$offset]);
}
public function offsetUnset($offset)
{
unset($this->_storage);
}
}
I solved it using this:
class Colunas implements ArrayAccess {
public $cols = array();
public function offsetSet($offset, $value) {
$coluna = new Coluna($value);
if (!is_array($offset)) {
$this->cols[$offset] = $coluna;
} else {
if (!isset($this->cols[$offset[0]])) $this->cols[$offset[0]] = array();
$col = &$this->cols[$offset[0]];
for ($i = 1; $i < sizeof($offset); $i++) {
if (!isset($col[$offset[$i]])) $col[$offset[$i]] = array();
$col = &$col[$offset[$i]];
}
$col = $coluna;
}
}
public function offsetExists($offset) {
if (!is_array($offset)) {
return isset($this->cols[$offset]);
} else {
$key = array_shift($offset);
if (!isset($this->cols[$key])) return FALSE;
$col = &$this->cols[$key];
while ($key = array_shift($offset)) {
if (!isset($col[$key])) return FALSE;
$col = &$col[$key];
}
return TRUE;
}
}
public function offsetUnset($offset) {
if (!is_array($offset)) {
unset($this->cols[$offset]);
} else {
$col = &$this->cols[array_shift($offset)];
while (sizeof($offset) > 1) $col = &$col[array_shift($offset)];
unset($col[array_shift($offset)]);
}
}
public function offsetGet($offset) {
if (!is_array($offset)) {
return $this->cols[$offset];
} else {
$col = &$this->cols[array_shift($offset)];
while (sizeof($offset) > 0) $col = &$col[array_shift($offset)];
return $col;
}
}
}
So you can use it with:
$colunas = new Colunas();
$colunas['foo'] = 'Foo';
$colunas[array('bar', 'a')] = 'Bar A';
$colunas[array('bar', 'b')] = 'Bar B';
echo $colunas[array('bar', 'a')];
unset($colunas[array('bar', 'a')]);
isset($colunas[array('bar', 'a')]);
unset($colunas['bar']);
Please note that I don't check if offset is null, and if it's an array, it must be of size > 1.
Mainly according to Dakota's solution* I want to share my simplification of it.
*) Dakota's was the most understandable one to me and the outcome is quite great (- the others seem quite similar great).
So, for the ones like me, who have their difficulties in understanding what's going on here:
class DimensionalArrayAccess implements ArrayAccess {
private $_arr;
public function __construct(array $arr = array()) {
foreach ($arr as $key => $value)
{
$this[$key] = $value;
}
}
public function offsetSet($offset, $val) {
if (is_array($val)) $val = new self($val);
if ($offset === null) {
$this->_arr[] = $val;
} else {
$this->_arr[$offset] = $val;
}
}
// as normal
public function offsetGet($offset) {
return $this->_arr[$offset];
}
public function offsetExists($offset) {
return isset($this->_arr[$offset]);
}
public function offsetUnset($offset) {
unset($this->_arr);
}
}
class Example extends DimensionalArrayAccess {
function __construct() {
parent::__construct([[["foo"]]]);
}
}
$ex = new Example();
echo $ex[0][0][0];
$ex[0][0][0] = 'bar';
echo $ex[0][0][0];
I did some changes:
deleted the toArray-function, as it has no immediate purpose as long as you don't want to convert your object into an real (in Dakota's case associative) array.
deleted the clone-thing, as it has no immediate purpose as long as you don't want to clone your object.
renamed the extended class and same vars: seems more understandable to me. especially I want to emphasize, that the DimensionalArrayAccess-class gives array-like access to your object even for 3- or more-dimensional (and of course also non-associative) 'arrays' - at least as long as you instanciate it with an array counting the number of dimensions you need.
last it seems important to me to emphasize, that as you can see the Example-class itself is not dependent on a constructor variable, whereas the DimensionalArrayAccess-class is (as it calls itself in the offsetSet-function recursively.
As I introduced, this post is rather for the not so advanced ones like me.
EDIT: this only works for cells which are set during instantiation, whereas it is not possible to add new cells afterwards.
class Test implements \ArrayAccess {
private
$input = [];
public function __construct () {
$this->input = ['foo' => ['bar' => 'qux']];
}
public function offsetExists ($offset) {}
public function offsetGet ($offset) {}
public function offsetSet ($offset, $value) {}
public function offsetUnset ($offset) {}
}
runkit_method_redefine ('Test', 'offsetGet', '&$offset', 'return $this->input[$offset];');
$ui = new Test;
var_dump($ui['foo']['bar']); // string(3) "qux"