PHP Looping through an array with strings AND an array inside - php

Question

This is a basic looping question but with a twist, so it's likely that i'm missing something easy - apologies in advance...
I'm trying to pull the results from an array $testoutput - which is filled with 3 arrays:
Running the following code:
foreach ($testoutput as $ID => $Array) {
echo $Array . "<BR>";
}
Returns:
ARRAY
ARRAY
ARRAY
Adding a second nested loop with the following code:
foreach ($testoutput as $ID => $Array) {
foreach ($Array as $ID => $L1item) {
echo $L1item . "<BR>";
}
}
Results in:
String1a
String1b
String1c
ARRAY
String2a
String2b
String2c
ARRAY
String3a
String3b
String3c
ARRAY
I'm fine with retuning all of the above strings, however, I can't figure out how to return the values from the 3rd-level of nested Arrays.
Is there an easy way to do this?
Many thanks in advance.

Answer 1

You can use array_map
$testoutput = array('x', array('y', 'z', array('1', '2', '3')));
function output($element) {
if(is_array($element)) {
array_map('output', $element); //RECURSION
return;
}
echo $element;
}
array_map('output', $testoutput);
Or if you prefer, you can use array_walk_recursive:
function output(&$value, $index) {
echo $value;
}
array_walk_recursive($testoutput, 'output');

Answer 2

Try this:
/**
* array nested_array_map(callback $callback, array $array)
* Warning - doesn't check for recursion,
* therefore child arrays shouldn't contain references to any of parent level arrays
*
* #param $callback, function
* #param $array, array of elements to map the function to
* #return array
*/
function nested_array_map($callback, $param) {
if (!is_array($param)) {
return call_user_func($callback, $param);
}
$result = array();
foreach ($param as $index => $value) {
$result[$index] = nested_array_map($callback, $value);
}
return $result;
}
function echo_value($value) {
echo "$value\n";
return $value;
}
$test = array(
'1st level'
,array(
'2nd level'
,array(
'3rd level'
)
,'2nd level'
)
,array(
'2nd level'
)
,'1st level'
);
$result = nested_array_map('echo_value', $test);

Answer 3

foreach ($testoutput as $key1 => $value1) {
foreach ($value1 as $key2 => $value2) {
if(is_array($value2))
{
foreach ($value2 as $key3 => $value3) {
echo $value3;
}
}
else
{
echo $value2;
}
}
}