I have two arrays with the following values,
First Array:
Array
(
[Strongly Agree] => 100
)
Second Array:
Array
(
[0] => Strongly Agree
[1] => Agree
[2] => Neither Agree or Disagree
[3] => Strongly Disagree
)
I need the output should like this,
Array (
[0] => 100
[1] => 0
[2] => 0
[3] => 0
)
Try like
foreach($array2 as $key => $value) {
$temp = array_key_exists($value, $array2) ? $array1[$value] : 0;
$newArr[$key] = $temp;
}
array key exists won't trigger notices
$sample = array('Strongly Agree' => 100);
$alternatives = array( 'Strongly Agree', 'Agree', 'Neither Agree or Disagree', 'Strongly Disagree');
$output=array();
foreach($alternatives as $alternative) {
$output[$alternative] = array_key_exists($alternative, $sample)? $sample[$alternative]:0;
}
print_r($output);
Try
$arr2 = array_merge(array_fill_keys($arr2, 0), $arr1);
See demo here
Related
Seems like a pretty basic question, but how can I simplify an array such as:
Array
(
[0] => Array
(
[blue_dog_1] => 2
)
[1] => Array
(
[red_dog_1] => 4
)
[2] => Array
(
[red_dog_2] => 6
)
)
To be like:
Array
(
[blue_dog_1] => 2
[red_dog_1] => 4
[red_dog_2] => 6
)
Thanks in advance.
Try this way to make it single dimension from multi dimension using array_merge
$singleD = array_reduce($multiD, 'array_merge', array());
OR
$singleD = call_user_func_array('array_merge', $multiD);
Try this,
foreach($array as $sub_val)
{
foreach($sub_val as $key=>$val)
{
$new_array[$key] = $val;
}
}
print_r($new_array);
To accomplish this you can simply use array union operator.
$oldData = array(
0 => array('blue_dog_1'=>2),
1 => array('red_dog_1'=>4),
2 => array('red_dog_2'=>6)
);
$newData = array();
foreach ($oldData as $arrayData) {
$newData += $arrayData;
}
print_r($newData);
Is there a function/method I am unaware of that avoids removal of like keys when the array is flipped. Example below:
Original array:
Array ( [last_modified] => input [published] => input [project_content] => textarea )
With array flip (collision of keys):
Array ( [input] => published [textarea] => project_content )
If you want to preserve your keys, you can have a two dimensional array:
<?php
$arr = array ( 'last_modified' => 'input', 'published' => 'input', 'project_content' => 'textarea' );
$result = array();
foreach($arr as $k => $v) {
if (array_key_exists($v, $result)) {
$result[$v][] = $k;
} else {
$result[$v] = array($k);
}
}
print_r($result);
?>
This will print out:
Array
(
[input] => Array
(
[0] => last_modified
[1] => published
)
[textarea] => Array
(
[0] => project_content
)
)
There is a dead simple way to get all the keys in the array that have the value "input" using the standard function array_keys:
$keys = array_keys($array, "input");
That is all; see it in action.
There are many nice Q&A on Stackoverflow on how to take a multidimensional associative array and sum values in it. Unfortunately, I can't find one where the key names aren't lost.
For example:
$arr=array(
array('id'=>'1', 'amount'=>'5'),
array('id'=>'1', 'amount'=>'5'),
array('id'=>'2', 'amount'=>'1'),
array('id'=>'2', 'amount'=>'3')
);
I want the resulting array to look like this:
$result=array(
array('id'=>'1', 'amount'=>'10'),
array('id'=>'2', 'amount'=>'4')
);
Unfortunately the only thing I can figure out how to do is this:
$result = array();
foreach($arr as $amount){
if(!array_key_exists($amount['id'], $arr))
$result[$amount['id']] =0;
$result[$amount['id']] += $amount['amount'];
}
Which when echo'd as follows produces (notice the lack of the keys' words "id" and "amount"):
foreach($result as $id => $amount){
echo $id."==>".$amount."\n";
}
1==>10
2==>4
This is just to show that you already had the data you originally needed, though, the answer you accepted is a better way to deal with it.
You have the following to start with right?
$arr = array(
array('id'=>'1', 'amount'=>'5'),
array('id'=>'1', 'amount'=>'5'),
array('id'=>'2', 'amount'=>'1'),
array('id'=>'2', 'amount'=>'3')
);
Output
Array
(
[0] => Array
(
[id] => 1
[amount] => 5
)
[1] => Array
(
[id] => 1
[amount] => 5
)
[2] => Array
(
[id] => 2
[amount] => 1
)
[3] => Array
(
[id] => 2
[amount] => 3
)
)
Then you run it through the following algorithm:
$summedArr = array();
foreach ($arr as $amount) {
$summedArr['amount'][$amount['id']] += $amount['amount'];
$summedArr['id'][$amount['id']] = $amount['id'];
}
Now, disregarding the Notice warnings that are produced since you are referencing indexes that don't yet exist, this outputs the following:
Output
Array
(
[amount] => Array
(
[1] => 10
[2] => 4
)
[id] => Array
(
[1] => 1
[2] => 2
)
)
Do you see the keys, yet? Because I do.
Now iterate over the array:
foreach ($summedArr as $key => $value) {
echo $k . "==>" . $v . "\n";
}
Output
amount==>Array
id==>Array
That's not what you want, though. You want:
foreach ($summedArr as $key => $arr) {
foreach ($arr as $v) {
echo $key . "==>" . $v;
}
}
Why not use that method, and then reconstruct the array you want at the end?
$results = array();
foreach ($arr as $id=>$amount) {
$results[] = array('id' => $id, 'amount' => $amount);
}
Any other way of doing this would be more computationally expensive.
--$arr1----
Array
(
[0] => Array
(
[id] => 1
[Name] => AAA
)
[1] => Array
(
[id] => 6
[Name] => BBB
)
)
--$arr2---
Array
(
[0] => Array
(
[id] => 1
[Name] => AAA
)
[1] => Array
(
[id] => 6
[Name] => BBB
)
[2] => Array
(
[id] => 46
[Name] => CCC
)
)
I would like the final result as following. Is there anyone can help me?
--Final Result--
Array
(
[0] => Array
(
[id] => 46
[Name] => CCC
)
)
UPDATE---
In this case, the result of array_diff($arr1,$arr2) is empty.
The easiest way is Mark Baker's solution or just write your own simple function:
Code:
function arrdiff($a1, $a2) {
$res = array();
foreach($a2 as $a) if (array_search($a, $a1) === false) $res[] = $a;
return $res;
}
print_r(arrdiff($arr1, $arr2));
Output:
Array
(
[0] => Array
(
[id] => 46
[name] => CCC
)
)
$arr1 = array(array('id' => 1, 'Name' => 'AAA'),
array('id' => 6, 'Name' => 'BBB')
);
$arr2 = array(array('id' => 1, 'Name' => 'AAA'),
array('id' => 6, 'Name' => 'BBB'),
array('id' => 46, 'Name' => 'CCC')
);
$results = array_diff(array_map('serialize',$arr2),array_map('serialize',$arr1));
$results = array_map('unserialize',$results);
var_dump($results);
EDIT
And just for the sheer fun of it, you could use array_filter() instead of array_diff() - which means no need to serialize anything at all
$results = array_filter($arr2, function ($value) use($arr1) { return !in_array($value,$arr1); } );
var_dump($results);
You should use array_diff():
$finalResult = array_diff($arr2, $arr1);
If you need more complex comparison you may also build foreach loop and use like this:
function compareItems( $a, $b){
return $a['id'] == $b['id']; // Example compare criteria
}
$result = array();
foreach( $arr1 as $item){
foreach( $arr2 as $key => $it){
if( !compareItems( $item, $it)){
$result[] = $it; // Either build new array
unset( $arr2[$key]); // Or remove items from original array
break;
}
}
}
And than you'll probably want to implement the same with reversed order of $arr1 and $arr2.
You can solve this with array_udiff()
function arr_comp($a, $b)
{
if ($a['id'] == $b['id'])
return 0;
else if ($a['id'] > $b['id'])
return 1;
else
return -1;
}
$result = array_udiff($arr2, $arr1, 'arr_comp');
or if you don't know in which array the differences may be you can try:
$res1 = array_udiff($arr1, $arr2, 'arr_comp');
$res2 = array_udiff($arr2, $arr1, 'arr_comp');
$result = array_merge($res1, $res2);
$arrDif=array();
$i=0;
foreach($arr1 as $value)
{
if(!in_array($value, $arr2))
{
$arrDif[$i]=$value;
$i++;
}
}
Take a look at the PHP built-in function array_diff. That'll help you out :-) Just pass your two arrays, and store the array returned by array_diff(), which will contain the differences between the two arrays.
As you're using multi-dimensional arrays, look at this comment on the PHP website: http://www.php.net/manual/en/function.array-diff.php#98680.
I have an array that looks like
Array
(
[1] => Array
(
[0] => Date
[1] => Action
)
[2] => Array
(
[0] => 2011-01-22 11:23:19
[1] => SHARE_TWEET
)
[3] => Array
(
[0] => 2011-01-22 11:23:19
[1] => SHARE_FACEBOOK
)
and many other different values (about 10), what I want to do is I want to count the number of times a string is in the array. I was going to use array_count_values but it doesn't count multidimensional arrays.
Any other options?
This could be done by first flattening the array, and then using array_count_values() on it:
For flattening, here is the trick:
$array = call_user_func_array('array_merge', $arrays);
And then:
$counts = array_count_values($array);
Output:
array (
'Date' => 1,
'Action' => 1,
'2011-01-22 11:23:19' => 2,
'SHARE_TWEET' => 1,
'SHARE_FACEBOOK' => 1,
)
Full code:
$array = call_user_func_array('array_merge', $arrays);
var_export(array_count_values($array));
Any time you're dealing with arrays, especially with loops in PHP I can't string enough suggest you look at the array documentation, You'd be suprised how quickly you realise most of the loops in your code is unnecessary. PHP has a built in function to achieve what you're after called array_walk_recursive. And since you're using PHP5 you can use closures rather that create_function (which can be very troublesome, especially to debug, and can't be optimised by the PHP interpreter afik)
$strings = array();
array_walk_recursive($arr, function($value, $key) use (&$strings) {
$strings[$value] = isset($strings[$value]) ? $strings[$value]+1 : 1;
});
I know, unary statements aren't always clear, but this one is simple enough, but feel free to expand out the if statement.
The result of the above is:
print_r($strings);
Array
(
[Date] => 1,
[Action] => 1,
[2011-01-22 11:23:19] => 2,
[SHARE_TWEET] => 1,
[SHARE_FACEBOOK] => 1,
)
Pseudo Code
$inputArray = // your array as in the example above
foreach ($inputArray as $key => $value) {
$result[$value[1]] = $result[$value[1]] + 1;
}
var_dump($result);
Here is a way to do the job:
$arr = Array (
1 => Array (
0 => 'Date',
1 => 'Action'
),
2 => Array (
0 => '2011-01-22 11:23:19',
1 => 'SHARE_TWEET'
),
3 => Array (
0 => '2011-01-22 11:23:19',
1 => 'SHARE_FACEBOOK'
)
);
$result = array();
function count_array($arr) {
global $result;
foreach($arr as $k => $v) {
if (is_array($v)) {
count_array($v);
} else {
if (isset($result[$v])) {
$result[$v]++;
} else {
$result[$v] = 1;
}
}
}
}
count_array($arr);
print_r($result);
output:
Array
(
[Date] => 1
[Action] => 1
[2011-01-22 11:23:19] => 2
[SHARE_TWEET] => 1
[SHARE_FACEBOOK] => 1
)