Mixing
Is there a way to loop through a multidimensional array without knowing it's depth?
So far, if I have to loop through a multidimensional array, I use a foreach loop for each dimension.
e.g for two dimensions
foreach($array as $key=>$value)
{
foreach($value as $k2=>$v2)
{
echo
}
}
What do I do when I don't know the depth of the array? ie the depth is variable.
The only thing I can think of is to code a whole stack of loops and to break the loop if the next value is not an array.This seems a little silly.
Is there a better way?
php arrays nested-loops
asked Jun 7 '12 at 9:19
Matthew AndrianakosMatthew Andrianakos
95116
add a comment |
So far, if I have to loop through a multidimensional array, I use a foreach loop for each dimension.
e.g for two dimensions
foreach($array as $key=>$value)
{
foreach($value as $k2=>$v2)
{
echo
}
}
What do I do when I don't know the depth of the array? ie the depth is variable.
The only thing I can think of is to code a whole stack of loops and to break the loop if the next value is not an array.This seems a little silly.
Is there a better way?
php arrays nested-loops
asked Jun 7 '12 at 9:19
Matthew AndrianakosMatthew Andrianakos
95116
add a comment |
So far, if I have to loop through a multidimensional array, I use a foreach loop for each dimension.
e.g for two dimensions
foreach($array as $key=>$value)
{
foreach($value as $k2=>$v2)
{
echo
}
}
What do I do when I don't know the depth of the array? ie the depth is variable.
The only thing I can think of is to code a whole stack of loops and to break the loop if the next value is not an array.This seems a little silly.
Is there a better way?
php arrays nested-loops
asked Jun 7 '12 at 9:19
Matthew AndrianakosMatthew Andrianakos
95116
So far, if I have to loop through a multidimensional array, I use a foreach loop for each dimension.
e.g for two dimensions
foreach($array as $key=>$value)
{
foreach($value as $k2=>$v2)
{
echo
}
}
What do I do when I don't know the depth of the array? ie the depth is variable.
The only thing I can think of is to code a whole stack of loops and to break the loop if the next value is not an array.This seems a little silly.
Is there a better way?
php arrays nested-loops
php arrays nested-loops
asked Jun 7 '12 at 9:19
Matthew AndrianakosMatthew Andrianakos
95116
asked Jun 7 '12 at 9:19
Matthew AndrianakosMatthew Andrianakos
95116
asked Jun 7 '12 at 9:19
Matthew AndrianakosMatthew Andrianakos
95116
asked Jun 7 '12 at 9:19
Matthew AndrianakosMatthew Andrianakos
95116
asked Jun 7 '12 at 9:19
Matthew AndrianakosMatthew Andrianakos
95116
95116
add a comment |
add a comment |
5 Answers
5
active
oldest
votes
Yes, you can use recursion. Here's an example where you output all the elements in an array:
function printAll($a) {
if (!is_array($a)) {
echo $a, ' ';
return;
}
foreach($a as $v) {
printAll($v);
}
}
$array = array('hello',
array('world',
'!',
array('whats'),
'up'),
array('?'));
printAll($array);
What you should always remember when doing recursion is that you need a base case where you won't go any deeper.
I like to check for the base case before continuing the function. That's a common idiom, but is not strictly necessary. You can just as well check in the foreach loop if you should output or do a recursive call, but I often find the code to be harder to maintain that way.
The "distance" between your current input and the base case is called a variant and is an integer. The variant should be strictly decreasing in every recursive call. The variant in the previous example is the depth of $a. If you don't think about the variant you risk ending up with infinite recursions and eventually the script will die due to a stack overflow. It's not uncommon to document exactly what the variant is in a comment before recursive functions.
answered Jun 7 '12 at 9:28
Emil VikströmEmil Vikström
74.5k13109151
1
No. Use the builtin array_walk_recursive(). PHP sucks at recursion.
– Ярослав Рахматуллин
Dec 1 '17 at 12:38
array_walk_recursive only handles leaf nodes and skips sub-arrays. It would be unusable with the example given. php.net/manual/en/function.array-walk-recursive.php
– Matt Smith
Jul 18 '18 at 5:15
add a comment |
You can use recursion for this problem:
Here is one example
$array = array(1 => array(1 => "a", 2 => array(1 => "b", 2 => "c", 3 => array(1 => "final value"))));
//print_r($array);
printAllValues($array);
function printAllValues($arr) {
if(!is_array($arr)) {
echo '<br />' . $arr;
return;
}
foreach($arr as $k => $v) {
printAllValues($v);
}
}
It will use recursion to loop through array
It will print like
a
b
c
final value
answered Jun 7 '12 at 9:28
SanjaySanjay
1,25011027
add a comment |
Simple function inside array_walk_recursive to show the level of nesting and the keys and values:
array_walk_recursive($array, function($v, $k) {
static $l = 0;
echo "Level " . $l++ . ": $k => $vn";
});
Another one showing use with a reference to get a result:
array_walk_recursive($array, function($v) use(&$result) {
$result = $v;
});
answered Jan 24 '18 at 21:35
AbraCadaverAbraCadaver
58.1k73966
array_walk_recursive only handles leaf nodes and skips sub-arrays. It would be unusable with the example given. php.net/manual/en/function.array-walk-recursive.php
– Matt Smith
Jul 18 '18 at 5:17
add a comment |
You can do the below function for loop-through-a-multidimensional-array-without-knowing-its-depth
// recursive function loop through the dimensional array
function loop($array){
//loop each row of array
foreach($array as $key => $value)
{
//if the value is array, it will do the recursive
if(is_array($value) ) $array[$key] = loop($array[$key]);
if(!is_array($value))
{
// you can do your algorithm here
// example:
$array[$key] = (string) $value; // cast value to string data type
}
}
return $array;
}
by using above function, it will go through each of the multi dimensional array, below is the sample array you could pass to loop function :
//array sample to pass to loop() function
$data = [
'invoice' => [
'bill_information' => [
'price' => 200.00,
'quantity' => 5
],
'price_per_quantity' => 50.00
],
'user_id' => 20
];
// then you can pass it like this :
$result = loop($data);
var_dump($result);
//it will convert all the value to string for this example purpose
answered Dec 12 '18 at 4:46
bathulah mahirbathulah mahir
342315
add a comment |
Based on previous recursion examples, here is a function that keeps an array of the path of keys a value is under, in case you need to know how you got there:
function recurse($a,$keys=array())
{
if (!is_array($a))
{
echo implode("-", $keys)." => $a <br>";
return;
}
foreach($a as $k=>$v)
{
$newkeys = array_merge($keys,array($k));
recurse($v,$newkeys);
}
}
recurse($array);
answered Jan 1 at 19:25
HenryHenry
1,04311219
add a comment |
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5 Answers
5
active
oldest
votes
5 Answers
5
active
oldest
votes
active
oldest
votes
active
oldest
votes
Yes, you can use recursion. Here's an example where you output all the elements in an array:
function printAll($a) {
if (!is_array($a)) {
echo $a, ' ';
return;
}
foreach($a as $v) {
printAll($v);
}
}
$array = array('hello',
array('world',
'!',
array('whats'),
'up'),
array('?'));
printAll($array);
What you should always remember when doing recursion is that you need a base case where you won't go any deeper.
I like to check for the base case before continuing the function. That's a common idiom, but is not strictly necessary. You can just as well check in the foreach loop if you should output or do a recursive call, but I often find the code to be harder to maintain that way.
The "distance" between your current input and the base case is called a variant and is an integer. The variant should be strictly decreasing in every recursive call. The variant in the previous example is the depth of $a. If you don't think about the variant you risk ending up with infinite recursions and eventually the script will die due to a stack overflow. It's not uncommon to document exactly what the variant is in a comment before recursive functions.
answered Jun 7 '12 at 9:28
Emil VikströmEmil Vikström
74.5k13109151
1
No. Use the builtin array_walk_recursive(). PHP sucks at recursion.
– Ярослав Рахматуллин
Dec 1 '17 at 12:38
array_walk_recursive only handles leaf nodes and skips sub-arrays. It would be unusable with the example given. php.net/manual/en/function.array-walk-recursive.php
– Matt Smith
Jul 18 '18 at 5:15
add a comment |
Yes, you can use recursion. Here's an example where you output all the elements in an array:
function printAll($a) {
if (!is_array($a)) {
echo $a, ' ';
return;
}
foreach($a as $v) {
printAll($v);
}
}
$array = array('hello',
array('world',
'!',
array('whats'),
'up'),
array('?'));
printAll($array);
What you should always remember when doing recursion is that you need a base case where you won't go any deeper.
I like to check for the base case before continuing the function. That's a common idiom, but is not strictly necessary. You can just as well check in the foreach loop if you should output or do a recursive call, but I often find the code to be harder to maintain that way.
The "distance" between your current input and the base case is called a variant and is an integer. The variant should be strictly decreasing in every recursive call. The variant in the previous example is the depth of $a. If you don't think about the variant you risk ending up with infinite recursions and eventually the script will die due to a stack overflow. It's not uncommon to document exactly what the variant is in a comment before recursive functions.
answered Jun 7 '12 at 9:28
Emil VikströmEmil Vikström
74.5k13109151
1
No. Use the builtin array_walk_recursive(). PHP sucks at recursion.
– Ярослав Рахматуллин
Dec 1 '17 at 12:38
array_walk_recursive only handles leaf nodes and skips sub-arrays. It would be unusable with the example given. php.net/manual/en/function.array-walk-recursive.php
– Matt Smith
Jul 18 '18 at 5:15
add a comment |
Yes, you can use recursion. Here's an example where you output all the elements in an array:
function printAll($a) {
if (!is_array($a)) {
echo $a, ' ';
return;
}
foreach($a as $v) {
printAll($v);
}
}
$array = array('hello',
array('world',
'!',
array('whats'),
'up'),
array('?'));
printAll($array);
What you should always remember when doing recursion is that you need a base case where you won't go any deeper.
I like to check for the base case before continuing the function. That's a common idiom, but is not strictly necessary. You can just as well check in the foreach loop if you should output or do a recursive call, but I often find the code to be harder to maintain that way.
The "distance" between your current input and the base case is called a variant and is an integer. The variant should be strictly decreasing in every recursive call. The variant in the previous example is the depth of $a. If you don't think about the variant you risk ending up with infinite recursions and eventually the script will die due to a stack overflow. It's not uncommon to document exactly what the variant is in a comment before recursive functions.
answered Jun 7 '12 at 9:28
Emil VikströmEmil Vikström
74.5k13109151
Yes, you can use recursion. Here's an example where you output all the elements in an array:
function printAll($a) {
if (!is_array($a)) {
echo $a, ' ';
return;
}
foreach($a as $v) {
printAll($v);
}
}
$array = array('hello',
array('world',
'!',
array('whats'),
'up'),
array('?'));
printAll($array);
What you should always remember when doing recursion is that you need a base case where you won't go any deeper.
I like to check for the base case before continuing the function. That's a common idiom, but is not strictly necessary. You can just as well check in the foreach loop if you should output or do a recursive call, but I often find the code to be harder to maintain that way.
The "distance" between your current input and the base case is called a variant and is an integer. The variant should be strictly decreasing in every recursive call. The variant in the previous example is the depth of $a. If you don't think about the variant you risk ending up with infinite recursions and eventually the script will die due to a stack overflow. It's not uncommon to document exactly what the variant is in a comment before recursive functions.
answered Jun 7 '12 at 9:28
Emil VikströmEmil Vikström
74.5k13109151
edited Jun 7 '12 at 10:10
answered Jun 7 '12 at 9:28
Emil VikströmEmil Vikström
74.5k13109151
answered Jun 7 '12 at 9:28
Emil VikströmEmil Vikström
74.5k13109151
answered Jun 7 '12 at 9:28
Emil VikströmEmil Vikström
74.5k13109151
74.5k13109151
1
No. Use the builtin array_walk_recursive(). PHP sucks at recursion.
– Ярослав Рахматуллин
Dec 1 '17 at 12:38
array_walk_recursive only handles leaf nodes and skips sub-arrays. It would be unusable with the example given. php.net/manual/en/function.array-walk-recursive.php
– Matt Smith
Jul 18 '18 at 5:15
add a comment |
1
No. Use the builtin array_walk_recursive(). PHP sucks at recursion.
– Ярослав Рахматуллин
Dec 1 '17 at 12:38
array_walk_recursive only handles leaf nodes and skips sub-arrays. It would be unusable with the example given. php.net/manual/en/function.array-walk-recursive.php
– Matt Smith
Jul 18 '18 at 5:15
1
1
No. Use the builtin array_walk_recursive(). PHP sucks at recursion.
– Ярослав Рахматуллин
Dec 1 '17 at 12:38
No. Use the builtin array_walk_recursive(). PHP sucks at recursion.
– Ярослав Рахматуллин
Dec 1 '17 at 12:38
array_walk_recursive only handles leaf nodes and skips sub-arrays. It would be unusable with the example given. php.net/manual/en/function.array-walk-recursive.php
– Matt Smith
Jul 18 '18 at 5:15
array_walk_recursive only handles leaf nodes and skips sub-arrays. It would be unusable with the example given. php.net/manual/en/function.array-walk-recursive.php
– Matt Smith
Jul 18 '18 at 5:15
add a comment |
You can use recursion for this problem:
Here is one example
$array = array(1 => array(1 => "a", 2 => array(1 => "b", 2 => "c", 3 => array(1 => "final value"))));
//print_r($array);
printAllValues($array);
function printAllValues($arr) {
if(!is_array($arr)) {
echo '<br />' . $arr;
return;
}
foreach($arr as $k => $v) {
printAllValues($v);
}
}
It will use recursion to loop through array
It will print like
a
b
c
final value
answered Jun 7 '12 at 9:28
SanjaySanjay
1,25011027
add a comment |
You can use recursion for this problem:
Here is one example
$array = array(1 => array(1 => "a", 2 => array(1 => "b", 2 => "c", 3 => array(1 => "final value"))));
//print_r($array);
printAllValues($array);
function printAllValues($arr) {
if(!is_array($arr)) {
echo '<br />' . $arr;
return;
}
foreach($arr as $k => $v) {
printAllValues($v);
}
}
It will use recursion to loop through array
It will print like
a
b
c
final value
answered Jun 7 '12 at 9:28
SanjaySanjay
1,25011027
add a comment |
You can use recursion for this problem:
Here is one example
$array = array(1 => array(1 => "a", 2 => array(1 => "b", 2 => "c", 3 => array(1 => "final value"))));
//print_r($array);
printAllValues($array);
function printAllValues($arr) {
if(!is_array($arr)) {
echo '<br />' . $arr;
return;
}
foreach($arr as $k => $v) {
printAllValues($v);
}
}
It will use recursion to loop through array
It will print like
a
b
c
final value
answered Jun 7 '12 at 9:28
SanjaySanjay
1,25011027
You can use recursion for this problem:
Here is one example
$array = array(1 => array(1 => "a", 2 => array(1 => "b", 2 => "c", 3 => array(1 => "final value"))));
//print_r($array);
printAllValues($array);
function printAllValues($arr) {
if(!is_array($arr)) {
echo '<br />' . $arr;
return;
}
foreach($arr as $k => $v) {
printAllValues($v);
}
}
It will use recursion to loop through array
It will print like
a
b
c
final value
answered Jun 7 '12 at 9:28
SanjaySanjay
1,25011027
answered Jun 7 '12 at 9:28
SanjaySanjay
1,25011027
answered Jun 7 '12 at 9:28
SanjaySanjay
1,25011027
answered Jun 7 '12 at 9:28
SanjaySanjay
1,25011027
1,25011027
add a comment |
add a comment |
Simple function inside array_walk_recursive to show the level of nesting and the keys and values:
array_walk_recursive($array, function($v, $k) {
static $l = 0;
echo "Level " . $l++ . ": $k => $vn";
});
Another one showing use with a reference to get a result:
array_walk_recursive($array, function($v) use(&$result) {
$result = $v;
});
answered Jan 24 '18 at 21:35
AbraCadaverAbraCadaver
58.1k73966
array_walk_recursive only handles leaf nodes and skips sub-arrays. It would be unusable with the example given. php.net/manual/en/function.array-walk-recursive.php
– Matt Smith
Jul 18 '18 at 5:17
add a comment |
Simple function inside array_walk_recursive to show the level of nesting and the keys and values:
array_walk_recursive($array, function($v, $k) {
static $l = 0;
echo "Level " . $l++ . ": $k => $vn";
});
Another one showing use with a reference to get a result:
array_walk_recursive($array, function($v) use(&$result) {
$result = $v;
});
answered Jan 24 '18 at 21:35
AbraCadaverAbraCadaver
58.1k73966
array_walk_recursive only handles leaf nodes and skips sub-arrays. It would be unusable with the example given. php.net/manual/en/function.array-walk-recursive.php
– Matt Smith
Jul 18 '18 at 5:17
add a comment |
Simple function inside array_walk_recursive to show the level of nesting and the keys and values:
array_walk_recursive($array, function($v, $k) {
static $l = 0;
echo "Level " . $l++ . ": $k => $vn";
});
Another one showing use with a reference to get a result:
array_walk_recursive($array, function($v) use(&$result) {
$result = $v;
});
answered Jan 24 '18 at 21:35
AbraCadaverAbraCadaver
58.1k73966
Simple function inside array_walk_recursive to show the level of nesting and the keys and values:
array_walk_recursive($array, function($v, $k) {
static $l = 0;
echo "Level " . $l++ . ": $k => $vn";
});
Another one showing use with a reference to get a result:
array_walk_recursive($array, function($v) use(&$result) {
$result = $v;
});
answered Jan 24 '18 at 21:35
AbraCadaverAbraCadaver
58.1k73966
answered Jan 24 '18 at 21:35
AbraCadaverAbraCadaver
58.1k73966
answered Jan 24 '18 at 21:35
AbraCadaverAbraCadaver
58.1k73966
answered Jan 24 '18 at 21:35
AbraCadaverAbraCadaver
58.1k73966
58.1k73966
array_walk_recursive only handles leaf nodes and skips sub-arrays. It would be unusable with the example given. php.net/manual/en/function.array-walk-recursive.php
– Matt Smith
Jul 18 '18 at 5:17
add a comment |
array_walk_recursive only handles leaf nodes and skips sub-arrays. It would be unusable with the example given. php.net/manual/en/function.array-walk-recursive.php
– Matt Smith
Jul 18 '18 at 5:17
array_walk_recursive only handles leaf nodes and skips sub-arrays. It would be unusable with the example given. php.net/manual/en/function.array-walk-recursive.php
– Matt Smith
Jul 18 '18 at 5:17
array_walk_recursive only handles leaf nodes and skips sub-arrays. It would be unusable with the example given. php.net/manual/en/function.array-walk-recursive.php
– Matt Smith
Jul 18 '18 at 5:17
add a comment |
You can do the below function for loop-through-a-multidimensional-array-without-knowing-its-depth
// recursive function loop through the dimensional array
function loop($array){
//loop each row of array
foreach($array as $key => $value)
{
//if the value is array, it will do the recursive
if(is_array($value) ) $array[$key] = loop($array[$key]);
if(!is_array($value))
{
// you can do your algorithm here
// example:
$array[$key] = (string) $value; // cast value to string data type
}
}
return $array;
}
by using above function, it will go through each of the multi dimensional array, below is the sample array you could pass to loop function :
//array sample to pass to loop() function
$data = [
'invoice' => [
'bill_information' => [
'price' => 200.00,
'quantity' => 5
],
'price_per_quantity' => 50.00
],
'user_id' => 20
];
// then you can pass it like this :
$result = loop($data);
var_dump($result);
//it will convert all the value to string for this example purpose
answered Dec 12 '18 at 4:46
bathulah mahirbathulah mahir
342315
add a comment |
You can do the below function for loop-through-a-multidimensional-array-without-knowing-its-depth
// recursive function loop through the dimensional array
function loop($array){
//loop each row of array
foreach($array as $key => $value)
{
//if the value is array, it will do the recursive
if(is_array($value) ) $array[$key] = loop($array[$key]);
if(!is_array($value))
{
// you can do your algorithm here
// example:
$array[$key] = (string) $value; // cast value to string data type
}
}
return $array;
}
by using above function, it will go through each of the multi dimensional array, below is the sample array you could pass to loop function :
//array sample to pass to loop() function
$data = [
'invoice' => [
'bill_information' => [
'price' => 200.00,
'quantity' => 5
],
'price_per_quantity' => 50.00
],
'user_id' => 20
];
// then you can pass it like this :
$result = loop($data);
var_dump($result);
//it will convert all the value to string for this example purpose
answered Dec 12 '18 at 4:46
bathulah mahirbathulah mahir
342315
add a comment |
You can do the below function for loop-through-a-multidimensional-array-without-knowing-its-depth
// recursive function loop through the dimensional array
function loop($array){
//loop each row of array
foreach($array as $key => $value)
{
//if the value is array, it will do the recursive
if(is_array($value) ) $array[$key] = loop($array[$key]);
if(!is_array($value))
{
// you can do your algorithm here
// example:
$array[$key] = (string) $value; // cast value to string data type
}
}
return $array;
}
by using above function, it will go through each of the multi dimensional array, below is the sample array you could pass to loop function :
//array sample to pass to loop() function
$data = [
'invoice' => [
'bill_information' => [
'price' => 200.00,
'quantity' => 5
],
'price_per_quantity' => 50.00
],
'user_id' => 20
];
// then you can pass it like this :
$result = loop($data);
var_dump($result);
//it will convert all the value to string for this example purpose
answered Dec 12 '18 at 4:46
bathulah mahirbathulah mahir
342315
You can do the below function for loop-through-a-multidimensional-array-without-knowing-its-depth
// recursive function loop through the dimensional array
function loop($array){
//loop each row of array
foreach($array as $key => $value)
{
//if the value is array, it will do the recursive
if(is_array($value) ) $array[$key] = loop($array[$key]);
if(!is_array($value))
{
// you can do your algorithm here
// example:
$array[$key] = (string) $value; // cast value to string data type
}
}
return $array;
}
by using above function, it will go through each of the multi dimensional array, below is the sample array you could pass to loop function :
//array sample to pass to loop() function
$data = [
'invoice' => [
'bill_information' => [
'price' => 200.00,
'quantity' => 5
],
'price_per_quantity' => 50.00
],
'user_id' => 20
];
// then you can pass it like this :
$result = loop($data);
var_dump($result);
//it will convert all the value to string for this example purpose
answered Dec 12 '18 at 4:46
bathulah mahirbathulah mahir
342315
edited Dec 12 '18 at 5:03
answered Dec 12 '18 at 4:46
bathulah mahirbathulah mahir
342315
answered Dec 12 '18 at 4:46
bathulah mahirbathulah mahir
342315
answered Dec 12 '18 at 4:46
bathulah mahirbathulah mahir
342315
342315
add a comment |
add a comment |
Based on previous recursion examples, here is a function that keeps an array of the path of keys a value is under, in case you need to know how you got there:
function recurse($a,$keys=array())
{
if (!is_array($a))
{
echo implode("-", $keys)." => $a <br>";
return;
}
foreach($a as $k=>$v)
{
$newkeys = array_merge($keys,array($k));
recurse($v,$newkeys);
}
}
recurse($array);
answered Jan 1 at 19:25
HenryHenry
1,04311219
add a comment |
Based on previous recursion examples, here is a function that keeps an array of the path of keys a value is under, in case you need to know how you got there:
function recurse($a,$keys=array())
{
if (!is_array($a))
{
echo implode("-", $keys)." => $a <br>";
return;
}
foreach($a as $k=>$v)
{
$newkeys = array_merge($keys,array($k));
recurse($v,$newkeys);
}
}
recurse($array);
answered Jan 1 at 19:25
HenryHenry
1,04311219
add a comment |
Based on previous recursion examples, here is a function that keeps an array of the path of keys a value is under, in case you need to know how you got there:
function recurse($a,$keys=array())
{
if (!is_array($a))
{
echo implode("-", $keys)." => $a <br>";
return;
}
foreach($a as $k=>$v)
{
$newkeys = array_merge($keys,array($k));
recurse($v,$newkeys);
}
}
recurse($array);
answered Jan 1 at 19:25
HenryHenry
1,04311219
Based on previous recursion examples, here is a function that keeps an array of the path of keys a value is under, in case you need to know how you got there:
function recurse($a,$keys=array())
{
if (!is_array($a))
{
echo implode("-", $keys)." => $a <br>";
return;
}
foreach($a as $k=>$v)
{
$newkeys = array_merge($keys,array($k));
recurse($v,$newkeys);
}
}
recurse($array);
answered Jan 1 at 19:25
HenryHenry
1,04311219
answered Jan 1 at 19:25
HenryHenry
1,04311219
answered Jan 1 at 19:25
HenryHenry
1,04311219
answered Jan 1 at 19:25
HenryHenry
1,04311219
1,04311219
add a comment |
add a comment |
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