I have an array that might be any depth or number of elements:
$ra['a'] = 'one';
$ra['b']['two'] = 'b2';
$ra['c']['two']['three'] = 'c23';
$ra['c']['two']['four'] = 'c24';
$ra['c']['five']['a'] = 'c5a';
I want to have an array of the strings, like this:
array (
0 => 'one',
1 => 'b2',
2 => 'c23',
3 => 'c24',
4 => 'c5a',
)
Here is a recursive function I made. It seems to work. But I'm not sure that I'm doing it right, as far as declaring the static, and when to unset the static var (in case I want to use the function again, I dont want that old static array)
function lastthinggetter($ra){
static $out;
foreach($ra as $r){
if(is_array($r))
lastthinggetter($r);
else
$out[] = $r;
}
return $out;
}
How do I make sure each time I call the function, the $out var is fresh, every time? Is there a better way of doing this?
Maybe check if we're in recursion?
function lastthinggetter($ra, $recurse=false){
static $out;
foreach($ra as $r){
if(is_array($r))
lastthinggetter($r, true);
else
$out[] = $r;
}
$tmp = $out;
if(!$recurse)
unset($out);
return $tmp;
}
Your last version will probably work correctly. However, if you want to get rid of the static variable you could also do it like this:
function getleaves($ra) {
$out=array();
foreach($ra as $r) {
if(is_array($r)) {
$out=array_merge($out,getleaves($r));
}
else {
$out[] = $r;
}
}
return $out;
}
The key here is, that you actually return the so far found values at the end of your function but so far you have not 'picked them up' in the calling part of your script. This version works without any static variables.
I'll simply use array_walk_recursive over here instead like as
array_walk_recursive($ra, function($v)use(&$result) {
$result[] = $v;
});
Demo
I have a question about a recursive PHP function.
I have an array of ID’s and a function, returning an array of „child id’s“ for the given id.
public function getChildId($id) {
…
//do some stuff in db
…
return childids;
}
One childid can have childids, too!
Now, I want to have an recursive function, collecting all the childids.
I have an array with ids like this:
$myIds = array("1111“,"2222“,"3333“,“4444“,…);
and a funktion:
function getAll($myIds) {
}
What I want: I want an array, containing all the id’s (including an unknown level of childids) on the same level of my array. As long as the getChildId($id)-function is returning ID’s…
I started with my function like this:
function getAll($myIds) {
$allIds = $myIds;
foreach($myIds as $mId) {
$childids = getChildId($mId);
foreach($childids as $sId) {
array_push($allIds, $sId);
//here is my problem.
//what do I have to do, to make this function rekursive to
//search for all the childids?
}
}
return $allIds;
}
I tried a lot of things, but nothing worked. Can you help me?
Assuming a flat array as in your example, you simply need to call a function that checks each array element to determine if its an array. If it is, the function calls it itself, if not the array element is appended to a result array. Here's an example:
$foo = array(1,2,3,
array(4,5,
array(6,7,
array(8,9,10)
)
),
11,12
);
$bar = array();
recurse($foo,$bar);
function recurse($a,&$bar){
foreach($a as $e){
if(is_array($e)){
recurse($e,$bar);
}else{
$bar[] = $e;
}
}
}
var_dump($bar);
DEMO
I think this code should do the trick
function getAll($myIds) {
$allIds = Array();
foreach($myIds as $mId) {
array_push($allIds, $mId);
$subids = getSubId($mId);
foreach($subids as $sId) {
$nestedIds = getAll($sId);
$allIds = array_merge($allIds, $nestedIds);
}
}
return $allIds;
}
Please help! I have been staring at this for too long. I have a property of an object that is an array of objects. I want to pass in an object to a method of the parent object and search through that array property for a match, and if one is found return the index. Otherwise, I need it to return -1. For some reason, it is not iterating. If I echo out what should be the $order->product property (where the index is pointing during the loop), it is unchanging. I have dumped the array and I know it contains different values. I can show you a big var dump, but I figured I would first ask if there is a simple error or something else that is obvious to you that I have missed.
public function getItemIndex($prod) {
if (isset($this->orders)){
foreach($this->orders as $key => $order) {
if ($order->product == $prod) { //if I echo this $order->product to the screen, it is unchanging
return $key;
} else { return -1; }
}
}
else {
return -1;
}
}
If anyone has any ideas, I am open to discuss and post more information as needed. Thank you for your time.
You are ALWAYS returning a value on the first iteration, either the $key or -1. Try removing the else statement that you currently have. This will allow you to fully iterate over the entire array.
public function getItemIndex($prod) {
if (isset($this->orders)){
foreach($this->orders as $key => $order) {
if ($order->product == $prod) { //if I echo this $order->product to the screen, it is unchanging
return $key;
}
}
}
return -1;
}
This will ONLY return -1 once it has iterated over everything and found nothing to match. It will still return $key if it finds a match.
$arrResult=array(
0=>array('categoryid'=>112,'catname'=>'apperal','subcategory'=>array(
412=>array('categoryid'=>428,'catname'=>'rainwear','subcategory'=>array(
428=>array('categoryid'=>413,'catname'=>'summer','subcategory'=>array()))))));
print_r($arrResult);
$iterator = new RecursiveArrayIterator($arrResult);
iterator_apply($iterator, 'traverseStructure', array($iterator));
function traverseStructure($iterator) {
$arrAddResult=array('categoryid'=>416,'catname'=>'winter','subcategory'=>array());
while ( $iterator -> valid() ) {
if ( $iterator -> hasChildren() ) {
traverseStructure($iterator -> getChildren());
}
else {
if($iterator -> current() == 413)
{
$arr=&$iterator;
$a='arr';
${$a}['subcategory']=$arrAddResult;
break;
}
}
$iterator -> next();
}
}
the expected output is to append the 'arrAddResult' appenedn in $arrResult. But with some reason the iterator get modify but it doesn't reflect the modification in arrResult array.
I tried passing the array by ref in function 'traverseStructure' but still struggling to get the correct output.
I am trying iterator first. I have to constructor a N-Level associative array as arrResult hence opt to use the iterator.
Here's an example on a way of doing this with one array.
<?php
$arrResult=array(
1=>array('categoryid'=>112,'catname'=>'apperal','subcategory'=>array()),
0=>array('categoryid'=>112,'catname'=>'apperal','subcategory'=>array(
1=>array('categoryid'=>112,'catname'=>'rainwear','subcategory'=>array(
1=>array('categoryid'=>112,'catname'=>'apperal','subcategory'=>array()),
428=>array('categoryid'=>413,'catname'=>'summer','subcategory'=>array()))
),
412=>array('categoryid'=>428,'catname'=>'rainwear','subcategory'=>array(
1=>array('categoryid'=>112,'catname'=>'apperal','subcategory'=>array()),
428=>array('categoryid'=>413,'catname'=>'summer','subcategory'=>array()))
)
)
)
);
function append(&$ar,$who,$what){
// just a simple check, you can remove it
if(!is_array($ar))return false;
// loop through all keys
foreach($ar as $k=>$v){
// found node, i'm assuming you don't have the node multiple times
// if you want this to go forever, remove the returns and the if on the add()
if($v['categoryid']==$who){
$ar[$k]['subcategory'][]=$what;
return true;
}
// recursion !
if(add($ar[$k]['subcategory'],$who,$what))return true;// if found stop
}
// key not found here in this node or subnodes
return false;
}
append($arrResult,413,array('categoryid'=>416,'catname'=>'winter','subcategory'=>array()));
echo'<pre>';
var_dump($arrResult);
This might be inefficient on large arrays. I'd recommend making a class that caches the $who and $what so it doesn't get copied to all the levels of the traversal. The rest should be identical.
Is there a way to convert a multidimensional array to a stdClass object in PHP?
Casting as (object) doesn't seem to work recursively. json_decode(json_encode($array)) produces the result I'm looking for, but there has to be a better way...
As far as I can tell, there is no prebuilt solution for this, so you can just roll your own:
function array_to_object($array) {
$obj = new stdClass();
foreach ($array as $k => $v) {
if (strlen($k)) {
if (is_array($v)) {
$obj->{$k} = array_to_object($v); //RECURSION
} else {
$obj->{$k} = $v;
}
}
}
return $obj;
}
I know this answer is coming late but I'll post it for anyone who's looking for a solution.
Instead of all this looping etc, you can use PHP's native json_* function. I've got a couple of handy functions that I use a lot
/**
* Convert an array into a stdClass()
*
* #param array $array The array we want to convert
*
* #return object
*/
function arrayToObject($array)
{
// First we convert the array to a json string
$json = json_encode($array);
// The we convert the json string to a stdClass()
$object = json_decode($json);
return $object;
}
/**
* Convert a object to an array
*
* #param object $object The object we want to convert
*
* #return array
*/
function objectToArray($object)
{
// First we convert the object into a json string
$json = json_encode($object);
// Then we convert the json string to an array
$array = json_decode($json, true);
return $array;
}
Hope this can be helpful
You and many others have pointed to the JSON built-in functions, json_decode() and json_encode(). The method which you have mentioned works, but not completely: it won't convert indexed arrays to objects, and they will remain as indexed arrays. However, there is a trick to overcome this problem. You can use JSON_FORCE_OBJECT constant:
// Converts an array to an object recursively
$object = json_decode(json_encode($array, JSON_FORCE_OBJECT));
Tip: Also, as mentioned here, you can convert an object to array recursively using JSON functions:
// Converts an object to an array recursively
$array = json_decode(json_encode($object), true));
Important Note: If you do care about performance, do not use this method. While it is short and clean, but it is the slowest among alternatives. See my other answer in this thread relating this.
function toObject($array) {
$obj = new stdClass();
foreach ($array as $key => $val) {
$obj->$key = is_array($val) ? toObject($val) : $val;
}
return $obj;
}
You can use the array_map recursively:
public static function _arrayToObject($array) {
return is_array($array) ? (object) array_map([__CLASS__, __METHOD__], $array) : $array;
}
Works perfect for me since it doesn't cast for example Carbon objects to a basic stdClass (which the json encode/decode does)
/**
* Recursively converts associative arrays to stdClass while keeping integer keys subarrays as arrays
* (lists of scalar values or collection of objects).
*/
function a2o( array $array ) {
$resultObj = new \stdClass;
$resultArr = array();
$hasIntKeys = false;
$hasStrKeys = false;
foreach ( $array as $k => $v ) {
if ( !$hasIntKeys ) {
$hasIntKeys = is_int( $k );
}
if ( !$hasStrKeys ) {
$hasStrKeys = is_string( $k );
}
if ( $hasIntKeys && $hasStrKeys ) {
$e = new \Exception( 'Current level has both integer and string keys, thus it is impossible to keep array or convert to object' );
$e->vars = array( 'level' => $array );
throw $e;
}
if ( $hasStrKeys ) {
$resultObj->{$k} = is_array( $v ) ? a2o( $v ) : $v;
} else {
$resultArr[$k] = is_array( $v ) ? a2o( $v ) : $v;
}
}
return ($hasStrKeys) ? $resultObj : $resultArr;
}
Some of the other solutions posted here fail to tell apart sequential arrays (what would be [] in JS) from maps ({} in JS.) For many use cases it's important to tell apart PHP arrays that have all sequential numeric keys, which should be left as such, from PHP arrays that have no numeric keys, which should be converted to objects. (My solutions below are undefined for arrays that don't fall in the above two categories.)
The json_decode(json_encode($x)) method does handle the two types correctly, but is not the fastest solution. It's still decent though, totaling 25µs per run on my sample data (averaged over 1M runs, minus the loop overhead.)
I benchmarked a couple of variations of the recursive converter and ended up with the following. It rebuilds all arrays and objects (performing a deep copy) but seems to be faster than alternative solutions that modify the arrays in place. It clocks at 11µs per execution on my sample data:
function array_to_object($x) {
if (!is_array($x)) {
return $x;
} elseif (is_numeric(key($x))) {
return array_map(__FUNCTION__, $x);
} else {
return (object) array_map(__FUNCTION__, $x);
}
}
Here is an in-place version. It may be faster on some large input data where only small parts need to be converted, but on my sample data it took 15µs per execution:
function array_to_object_inplace(&$x) {
if (!is_array($x)) {
return;
}
array_walk($x, __FUNCTION__);
reset($x);
if (!is_numeric(key($x))) {
$x = (object) $x;
}
}
I did not try out solutions using array_walk_recursive()
public static function _arrayToObject($array) {
$json = json_encode($array);
$object = json_decode($json);
return $object
}
Because the performance is mentioned, and in fact it should be important in many places, I tried to benchmark functions answered here.
You can see the code and sample data here in this gist. The results are tested with the data exists there (a random JSON file, around 200 KB in size), and each function repeated one thousand times, for the results to be more accurate.
Here are the results for different PHP configurations:
PHP 7.4.16 (no JIT)
$ php -dopcache.enable_cli=1 benchmark.php
pureRecursive(): Completed in 0.000560s
pureRecursivePreservingIntKeys(): Completed in 0.000580s
jsonEncode(): Completed in 0.002045s
jsonEncodeOptimized(): Completed in 0.002060s
jsonEncodeForceObject(): Completed in 0.002174s
arrayMap(): Completed in 0.000561s
arrayMapPreservingIntKeys(): Completed in 0.000592s
arrayWalkInplaceWrapper(): Completed in 0.001016s
PHP 8.0.2 (no JIT)
$ php -dopcache.enable_cli=1 benchmark.php
pureRecursive(): Completed in 0.000535s
pureRecursivePreservingIntKeys(): Completed in 0.000578s
jsonEncode(): Completed in 0.001991s
jsonEncodeOptimized(): Completed in 0.001990s
jsonEncodeForceObject(): Completed in 0.002164s
arrayMap(): Completed in 0.000579s
arrayMapPreservingIntKeys(): Completed in 0.000615s
arrayWalkInplaceWrapper(): Completed in 0.001040s
PHP 8.0.2 (tracing JIT)
$ php -dopcache.enable_cli=1 -dopcache.jit_buffer_size=250M -dopcache.jit=tracing benchmark.php
pureRecursive(): Completed in 0.000422s
pureRecursivePreservingIntKeys(): Completed in 0.000410s
jsonEncode(): Completed in 0.002004s
jsonEncodeOptimized(): Completed in 0.001997s
jsonEncodeForceObject(): Completed in 0.002094s
arrayMap(): Completed in 0.000577s
arrayMapPreservingIntKeys(): Completed in 0.000593s
arrayWalkInplaceWrapper(): Completed in 0.001012s
As you see, the fastest method with this benchmark is pure recursive PHP functions (posted by #JacobRelkin and #DmitriySintsov), especially when it comes to the JIT compiler. When it comes to json_* functions, they are the slowest ones. They are about 3x-4x (in the case of JIT, 5x) slower than the pure method, which may seem unbelievable.
One thing to note: If you remove iterations (i.e. run each function only one time), or even strictly lower its count, the results would differ. In such cases, arrayMap*() variants win over pureRecursive*() ones (still json_* functions method should be the slowest). But, you should simply ignore these cases. In the terms of performance, scalability is much more important.
As a result, in the case of converting arrays to object (and vice versa?), you should always use pure PHP functions, resulting in the best performance, perhaps independent from your configurations.
The simpliest way to convert an associative array to object is:
First encode it in json, then decode it.
like $objectArray = json_decode(json_encode($associtiveArray));
Here's a function to do an in-place deep array-to-object conversion that uses PHP internal (shallow) array-to-object type casting mechanism.
It creates new objects only when necessary, minimizing data duplication.
function toObject($array) {
foreach ($array as $key=>$value)
if (is_array($value))
$array[$key] = toObject($value);
return (object)$array;
}
Warning - do not use this code if there is a risk of having circular references.
Here is a smooth way to do it that can handle an associative array with great depth and doesn't overwrite object properties that are not in the array.
<?php
function setPropsViaArray( $a, $o )
{
foreach ( $a as $k => $v )
{
if ( is_array( $v ) )
{
$o->{$k} = setPropsViaArray( $v, ! empty ( $o->{$k} ) ? $o->{$k} : new stdClass() );
}
else
{
$o->{$k} = $v;
}
}
return $o;
};
setPropsViaArray( $newArrayData, $existingObject );
Late, but just wanted to mention that you can use the JSON encoding/decoding to convert fully from/to array:
//convert object $object into array
$array = json_decode(json_encode($object), true);
//convert array $array into object
$object = json_decode(json_encode($array));
json_encode and json_decode functions are available starting from php 5.2
EDIT: This function is conversion from object to array.
From https://forrst.com/posts/PHP_Recursive_Object_to_Array_good_for_handling-0ka
protected function object_to_array($obj)
{
$arrObj = is_object($obj) ? get_object_vars($obj) : $obj;
foreach ($arrObj as $key => $val) {
$val = (is_array($val) || is_object($val)) ? $this->object_to_array($val) : $val;
$arr[$key] = $val;
}
return $arr;
}
I was looking for a way that acts like json_decode(json_encode($array))
The problem with most other recursive functions here is that they also convert sequential arrays into objects. However, the JSON variant does not do this by default. It only converts associative arrays into objects.
The following implementation works for me like the JSON variant:
function is_array_assoc ($arr) {
if (!is_array($arr)) return false;
foreach (array_keys($arr) as $k => $v) if ($k !== $v) return true;
return false;
}
// json_decode(json_encode($array))
function array_to_object ($arr) {
if (!is_array($arr) && !is_object($arr)) return $arr;
$arr = array_map(__FUNCTION__, (array)$arr);
return is_array_assoc($arr) ? (object)$arr : $arr;
}
// json_decode(json_encode($array, true))
// json_decode(json_encode($array, JSON_OBJECT_AS_ARRAY))
function object_to_array ($obj) {
if (!is_object($obj) && !is_array($obj)) return $obj;
return array_map(__FUNCTION__, (array)$obj);
}
If you want to have the functions as a class:
class ArrayUtils {
public static function isArrAssoc ($arr) {
if (!is_array($arr)) return false;
foreach (array_keys($arr) as $k => $v) if ($k !== $v) return true;
return false;
}
// json_decode(json_encode($array))
public static function arrToObj ($arr) {
if (!is_array($arr) && !is_object($arr)) return $arr;
$arr = array_map([__CLASS__, __METHOD__], (array)$arr);
return self::isArrAssoc($arr) ? (object)$arr : $arr;
}
// json_decode(json_encode($array, true))
// json_decode(json_encode($array, JSON_OBJECT_AS_ARRAY))
public static function objToArr ($obj) {
if (!is_object($obj) && !is_array($obj)) return $obj;
return array_map([__CLASS__, __METHOD__], (array)$obj);
}
}
If anyone finds any mistakes please let me know.
/**
* Convert a multidimensional array to an object recursively.
* For any arrays inside another array, the result will be an array of objects.
*
* #author Marcos Freitas
* #param array|any $props
* #return array|any
*/
function array_to_object($props, $preserve_array_indexes = false) {
$obj = new \stdClass();
if (!is_array($props)) {
return $props;
}
foreach($props as $key => $value) {
if (is_numeric($key) && !$preserve_array_indexes) {
if(!is_array($obj)) {
$obj = [];
}
$obj[] = $this->array_to_object($value);
continue;
}
$obj->{$key} = is_array($value) ? $this->array_to_object($value) : $value;
}
return $obj;
}
The shortest I could come up with:
array_walk_recursive($obj, function (&$val) { if (is_object($val)) $val = get_object_vars($val); });