how to flatten a multidimensional array in php [duplicate] - php

Question

This question already has answers here:
How to Flatten a Multidimensional Array?
(31 answers)
Closed 1 year ago.
This is my array and i want 60 , 20, 39, 70,12, 29,31,72,59 in a single array. one-dimensional array.
$marks = array(
"abc" => array(
"a" => 60,
"b" => 20,
"c" => 39
),
"def" => array(
"a" => 70,
"b" => 12,
"c" => 29
),
"xyz" => array(
"a" => 31,
"b" => 72,
"c" => 59
)
);
my try was
foreach($marks as $name=>$score)
{
foreach($score as $subject=>$number)
{
$array[]= $number;
}
}
But when i am printing this array it again generate three array.
on print_r($array); its showing this output.
Array ( [0] => 60 [1] => 20 [2] => 39 ) Array ( [0] => 60 [1] => 20 [2] => 39 [3] => 70 [4] => 12 [5] => 29 ) Array ( [0] => 60 [1] => 20 [2] => 39 [3] => 70 [4] => 12 [5] => 29 [6] => 31 [7] => 72 [8] => 59 )
is there any method to get only last array from the above array.or any other solution.

Answer 1

Try this to flatten the array:
<?php
$marks = array(
"abc" => array(
"a" => 60,
"b" => 20,
"c" => 39
),
"def" => array(
"a" => 70,
"b" => 12,
"c" => 29
),
"xyz" => array(
"a" => 31,
"b" => 72,
"c" => 59
)
);
function array_values_recursive($array)
{
$arrayValues = array();
foreach ($array as $value)
{
if (is_scalar($value) OR is_resource($value))
{
$arrayValues[] = $value;
}
elseif (is_array($value))
{
$arrayValues = array_merge($arrayValues, array_values_recursive($value));
}
}
return $arrayValues;
}
var_dump(array_values_recursive($marks));
Output:
array(9) { [0]=> int(60) [1]=> int(20) [2]=> int(39) [3]=> int(70) [4]=> int(12) [5]=> int(29) [6]=> int(31) [7]=> int(72) [8]=> int(59) }
This custom function was taken from: http://php.net/manual/en/function.array-values.php

Answer 2

you can do in either traditional way i.e. foreach loop and also can use iterator. have a look on below solution:
1) using foreach loop and array_merge function
$marks = array(
"abc" => array(
"a" => 60,
"b" => 20,
"c" => 39
),
"def" => array(
"a" => 70,
"b" => 12,
"c" => 29
),
"xyz" => array(
"a" => 31,
"b" => 72,
"c" => 59
)
);
$new_array = array();
foreach ($marks as $mark) {
$new_array = array_merge($new_array, array_values($mark));
}
print_r($new_array);
2) using ArrayIterator:
$new_array = array();
$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($marks));
foreach ($iterator as $key => $value) {
$new_array[] = $value;
}
print_r($new_array);
In both solution Output will be:
Array
(
[0] => 60
[1] => 20
[2] => 39
[3] => 70
[4] => 12
[5] => 29
[6] => 31
[7] => 72
[8] => 59
)

Answer 3

Because you're dumping $array inside the first foreach loop :)

Answer 4

Your sound like you may be declare your $array in for loop ,if you do so you will get three arrays.So declare outside of for loop will be get single array
$array = array(); //correct
foreach($marks as $name=>$score)
{
//$array = array(); //incorrect
foreach($score as $subject=>$number)
{
$array[]= $number;
}
}
var_dump($array);

Answer 5

foreach($marks as $name=>$score)
{
foreach($score as $subject=>$number)
{
$array[]= $number;
}
}