Convert three dimensional array to two dimensional array in PHP [duplicate] - php

Question

This question already has answers here:
How to Flatten a Multidimensional Array?
(31 answers)
Closed 6 years ago.
A little help needed here
I have this array:
0 => array:4 [▼
"StudentName" => "John Doe "
"StudentNumber" => "2055222"
0 => array:1 [▼
"Test" => 33.5
]
1 => array:1 [▼
"Assignment" => 57.0
]
]
1 => array:4 [▼
"StudentName" => "Jane Doe"
"StudentNumber" => "5222112"
0 => array:1 [▼
"Test" => 47.0
]
1 => array:1 [▼
"Assignment" => 68.0
]
]
2 => array:4 [▼
"StudentName" => "Alice Doe"
"StudentNumber" => "5555555"
0 => array:1 [▼
"Test" => 0.0
]
1 => array:1 [▼
"Assignment" => 67.0
]
]
And I want to convert it to look like this:
0 => array:4 [▼
"StudentName" => "John Doe "
"StudentNumber" => "20160022"
"Test" => 33.5
"Assignment" => 57.0]
Is there some sort of php function I can use?
Edit: Added more examples to help you think of a better solution

Answer 1

There's no native array flatten in PHP but you can do this:
function array_flatten($array) {
if (!is_array($array)) {
return false;
}
$result = array();
foreach ($array as $key => $value) {
if (is_array($value)) {
$result = array_merge($result, array_flatten($value));
} else {
$result[$key] = $value;
}
}
return $result;
}
Found here
Also numerous other approaches here: How to Flatten a Multidimensional Array?

Answer 2

You can do it using like this (not tested):
$arr = Array();
foreach($oldArr AS $k => $v){
if(is_array($v)){
foreach($v AS $a => $b){
$arr[$a] = $b;
}
}else{
$arr[$k] = $v;
}
}

Answer 3

This should work:
// Store your new array in a separate variable to avoid key conflicts with trying to us unset() in a loop
$new_array = array();
foreach($original_array as $k=>$v)
{
if(is_array($v)) // check if element is an array
{
foreach($v as $k2=>$v2) // loop the sub-array and add its keys/indexes to the new array
{
$new_array[$k2] = $v2;
}
}
else
{
// the element is not a sub-array so just add the key and value to the new array
$new_array[$k] = $v;
}
}