PHP foreach with Nested Array? - php

Question

I have a nested array in which I want to display a subset of results. For example, on the array below I want to loop through all the values in nested array[1].
Array
(
[0] => Array
(
[0] => one
[1] => Array
(
[0] => 1
[1] => 2
[2] => 3
)
)
[1] => Array
(
[0] => two
[1] => Array
(
[0] => 4
[1] => 5
[2] => 6
)
)
[2] => Array
(
[0] => three
[1] => Array
(
[0] => 7
[1] => 8
[2] => 9
)
)
)
I was trying to use the foreach function but I cannot seem to get this to work. This was my original syntax (though I realise it is wrong).
$tmpArray = array(array("one",array(1,2,3)),array("two",array(4,5,6)),array("three",array(7,8,9)));
foreach ($tmpArray[1] as $value) {
echo $value;
}
I was trying to avoid a variable compare on whether the key is the same as the key I want to search, i.e.
foreach ($tmpArray as $key => $value) {
if ($key == 1) {
echo $value;
}
}
Any ideas?

Answer 1

If you know the number of levels in nested arrays you can simply do nested loops. Like so:
// Scan through outer loop
foreach ($tmpArray as $innerArray) {
// Check type
if (is_array($innerArray)){
// Scan through inner loop
foreach ($innerArray as $value) {
echo $value;
}
}else{
// one, two, three
echo $innerArray;
}
}
if you do not know the depth of array you need to use recursion. See example below:
// Multi-dementional Source Array
$tmpArray = array(
array("one", array(1, 2, 3)),
array("two", array(4, 5, 6)),
array("three", array(
7,
8,
array("four", 9, 10)
))
);
// Output array
displayArrayRecursively($tmpArray);
/**
* Recursive function to display members of array with indentation
*
* #param array $arr Array to process
* #param string $indent indentation string
*/
function displayArrayRecursively($arr, $indent='') {
if ($arr) {
foreach ($arr as $value) {
if (is_array($value)) {
//
displayArrayRecursively($value, $indent . '--');
} else {
// Output
echo "$indent $value \n";
}
}
}
}
The code below with display only nested array with values for your specific case (3rd level only)
$tmpArray = array(
array("one", array(1, 2, 3)),
array("two", array(4, 5, 6)),
array("three", array(7, 8, 9))
);
// Scan through outer loop
foreach ($tmpArray as $inner) {
// Check type
if (is_array($inner)) {
// Scan through inner loop
foreach ($inner[1] as $value) {
echo "$value \n";
}
}
}

Answer 2

foreach ($tmpArray as $innerArray) {
// Check type
if (is_array($innerArray)){
// Scan through inner loop
foreach ($innerArray as $value) {
echo $value;
}
}else{
// one, two, three
echo $innerArray;
}
}

Answer 3

Both syntaxes are correct. But the result would be Array. You probably want to do something like this:
foreach ($tmpArray[1] as $value) {
echo $value[0];
foreach($value[1] as $val){
echo $val;
}
}
This will print out the string "two" ($value[0]) and the integers 4, 5 and 6 from the array ($value[1]).

Answer 4

As I understand , all of previous answers , does not make an Array output,
In my case :
I have a model with parent-children structure (simplified code here):
public function parent(){
return $this->belongsTo('App\Models\Accounting\accounting_coding', 'parent_id');
}
public function children()
{
return $this->hasMany('App\Models\Accounting\accounting_coding', 'parent_id');
}
and if you want to have all of children IDs as an Array , This approach is fine and working for me :
public function allChildren()
{
$allChildren = [];
if ($this->has_branch) {
foreach ($this->children as $child) {
$subChildren = $child->allChildren();
if (count($subChildren) == 1) {
$allChildren [] = $subChildren[0];
} else if (count($subChildren) > 1) {
$allChildren += $subChildren;
}
}
}
$allChildren [] = $this->id;//adds self Id to children Id list
return $allChildren;
}
the allChildren() returns , all of childrens as a simple Array .

Answer 5

I had a nested array of values and needed to make sure that none of those values contained &, so I created a recursive function.
function escape($value)
{
// return result for non-arrays
if (!is_array($value)) {
return str_replace('&', '&', $value);
}
// here we handle arrays
foreach ($value as $key => $item) {
$value[$key] = escape($item);
}
return $value;
}
// example usage
$array = ['A' => '&', 'B' => 'Test'];
$result = escape($array);
print_r($result);
// $result: ['A' => '&', 'B' => 'Test'];

Answer 6

array(
"IT"=>
array(
array('id'=>888,'First_name'=>'Raahul','Last_name'=>'Pandey'),
array('id'=>656,'First_name'=>'Ravi','Last_name'=>'Teja'),
array('id'=>998,'First_name'=>'HRX','Last_name'=>'HRITHIK')
),
// array(
"DS"=>
array(
array('id'=>87,'First_name'=>'kalia','Last_name'=>'Pandey'),
array('id'=>6576,'First_name'=>'Raunk','Last_name'=>'Teja'),
array('id'=>9987,'First_name'=>'Krish','Last_name'=>'HRITHIK')
)
// )
)
);
// echo "";
// print_r($a);
echo "";
print_r($a);
?>
////how to get id in place of index value....