I'm using MongoDB and PHP and trying to do a $in based on a generated array.
When I specify the same array manually, it works, but when I build it, it return any results with the same data.
There's what I have:
$settings = array();
foreach($items as $item) {
$settings[] = $item['id'];
}
//Settings is the same as this
$setting2 = array(1,2,3,4,5,6,7,8);
//This returns no results
$cursor = $collection->find(array('status' => 0, 'sid' => array('$in' => $settings)));
//This does return results
$cursor = $collection->find(array('status' => 0, 'sid' => array('$in' => $setting2)));
I've checked using
$cursor->info()
And the items in the array are the same.
Any ideas what I'm doing wrong?
Thanks!
It's likely that the data types of the numbers are not the same. Try using var_dump() on the built array, and the specified array. You'll probably see one has them as numbers in a string, and the other as simple integers.
Related
This is my code:
$amenitiesObject = array('parameter-amenities' => array('value' => $amenities));
$buildingObject = array('parameter-building' => array('value' => $building));
$data = array($amenitiesObject, $buildingObject);
$post_data = json_encode($data, JSON_FORCE_OBJECT);
return $post_data;
the result is:
{"0":{"parameter-amenities":{"value":""}},"1":{"parameter-building":{"value":""}}}
while i was hoping for this:
{"parameter-amenities":{"value":""},"parameter-building":{"value":""}}
what is my mistake please?
While #fusion3k's comment is correct and doing $data = array_merge( $amenitiesObject, $buildingObject ); fixes it, I'd like to explain it a little further so you can avoid this type of scenario.
When you do $data = array($amenitiesObject, $buildingObject);, you are not creating a merge of both arrays, you are creating an array with index 0 equals to $amenitiesObject and index 1 equals to $buildingObject, the equivalent of doing :
array(0 => $amenitiesObject, 1 => $buildingObject);
So the json_encode part is working as expected.
When you use array_merge, you maintain only ONE array, that is a combination on both arrays, so you have the expected result.
I have the following array, I'm trying to append the following ("","--") code
Array
(
[0] => Array
(
[Name] => Antarctica
)
)
Current JSON output
[{"Name":"Antarctica"}]
Desired output
{"":"--","Name":"Antarctica"}]
I have tried using the following:
$queue = array("Name", "Antarctica");
array_unshift($queue, "", "==");
But its not returning correct value.
Thank you
You can prepend by adding the original array to an array containing the values you wish to prepend
$queue = array("Name" => "Antarctica");
$prepend = array("" => "--");
$queue = $prepend + $queue;
You should be aware though that for values with the same key, the prepended value will overwrite the original value.
The translation of PHP Array to JSON generates a dictionary unless the array has only numeric keys, contiguous, starting from 0.
So in this case you can try with
$queue = array( 0 => array( "Name" => "Antarctica" ) );
$queue[0][""] = "--";
print json_encode($queue);
If you want to reverse the order of the elements (which is not really needed, since dictionaries are associative and unordered - any code relying on their being ordered in some specific way is potentially broken), you can use a sort function on $queue[0], or you can build a different array:
$newqueue = array(array("" => "--"));
$newqueue[0] += $queue[0];
which is equivalent to
$newqueue = array(array_merge(array("" => "--"), $queue[0]));
This last approach can be useful if you need to merge large arrays. The first approach is probably best if you need to only fine tune an array. But I haven't ran any performance tests.
Try this:
$queue = array(array("Name" => "Antarctica")); // Makes it multidimensional
array_unshift($queue, array("" => "--"));
Edit
Oops, just noticed OP wanted a Prepend, not an Append. His syntax was right, but we was missing the array("" => "--") in his unshift.
You can try this :
$queue = array("Name" => "Antarctica");
$result = array_merge(array("" => "=="), $queue);
var_dump(array_merge(array(""=>"--"), $arr));
Using the numbers from $ids, I want to pull the data from $nuts.
So for example:
$ids = [0,3,5]; // 0 calories, 3 sugar, 5 fat
$nuts = [
'calories' => 'cal',
'protein' => 'pro',
'carbohydrate' => 'car',
'sugar' => 'sug',
'fiber' => 'fib',
'fat' => 'fat',
];
$returnData = [
'calories' => 'cal',
'sugar' => 'sug',
'fat' => 'fat',
];
I could loop through each $ids number with a foreach(); but I'm curious to see if there is a better method than this?
$newNuts = array_values(array_flip($nuts));
foreach($ids as $i)
$returnData[$newNuts[$i]] = $nuts[$newNuts[$i]];
I did some work and realized, you don't need array_flip, array_values is fine.
$num_nuts = array_values ($nuts);
for ($z=0; $z<sizeof($ids); $z++) {
echo $num_nuts[$ids[$z]];
}
Just 1 more line of code, but I think it does the job. I think mine is going to be faster because the array_flip basically exchanges all keys with their associated values in an array, which is not what I am doing. It's actually one less pain.
I am simply converting the original array to a new one by index and simply looping upon it. Also, not the elegant way to use the power of PHP available to us, but works just fine. array_flip is O(n), but I think better not use it for larger data-sets.
How about a simple array_slice?
$result = array();
foreach ($ids as $i) {
$result += array_slice($nuts, $i, 1, true);
}
No need to create a copy of the array.
if i have the following array:
array(
'var1' => 123,
'var2' => 234,
'var3' => 345
);
I would like to extract specific parts of this to build a new array i.e. var1 and var3.
The result i would be looking for is:
array(
'var1' => 123,
'var3' => 345
);
The example posted is very stripped down, in reality the array has a much larger number of keys and I am looking to extract a larger number of key and also some keys may or may not be present.
Is there a built in php function to do this?
Edit:
The keys to be extracted will be hardcoded as an array in the class i..e $this->keysToExtract
$result = array_intersect_key($yourarray,array_flip(array('var1','var3')));
So, with your edit:
$result = array_intersect_key($yourarray,array_flip($this->keysToExtract));
You don't need a built in function to do this, try this :
$this->keysToExtract = array('var1', 'var3'); // The keys you wish to transfer to the new array
// For each record in your initial array
foreach ($firstArray as $key => $value)
{
// If the key (ex : 'var1') is part of the desired keys
if (in_array($key, $this->keysToExtract)
{
$finalArray[$key] = $value; // Add to the new array
}
}
var_dump($finalArray);
Note that this is most likely the most efficient way to do this.
I have this multidimensional array which I'll name "original":
$original=
array
0 =>
array
'animal' => 'cats'
'quantity' => 1
1 =>
array
'animal' => 'dogs'
'quantity' => '1'
2 =>
array
'animal' => 'cats'
'quantity' => '3'
However, I want to merge internal arrays with the same animal to produce this new array (with quantities combined):
$new=
array
0 =>
array
'animal' => 'cats'
'quantity' => 4
1 =>
array
'animal' => 'dogs'
'quantity' => '1'
I understand that there are similar questions on stackoverflow, but not similar enough for me to be able to figure out how to use the feedback those questions have gotted to apply to this specific example. Yes, I know I probably look stupid to a lot of you, but please remember that there was a time when you too didn't know crap about working with arrays :)
I've tried the following code, but get Fatal error: Unsupported operand types (Referring to line 11). And if I got that error to go away, I'm not sure if this code would even produce what I'm trying to achieve.
$new = array();
foreach($original as $entity){
if(!isset($new[$entity["animal"]])){
$new[$entity["animal"]] = array(
"animal" => $entity["animal"],
"quantity" => 0,
);
}
$new[$entity["animal"]] += $entity["quantity"];
}
So, I don't know what I'm doing and I could really use some help from the experts.
To try to give a super clear question, here goes... What changes do I need to make to the code so that it will take $original and turn it into $new? If the code I provided is totally wrong, could you provide an alternative example that would do the trick? Also, the only language I am familiar with is PHP, so please provide an example using only PHP.
Thank you
You're very close.
$new[$entity["animal"]] += $entity["quantity"];
needs to be
$new[$entity["animal"]]['quantity'] += $entity["quantity"];
In your if ( !isset [...] ) line, you're setting $new[$entity['animal']] to an array, so you need to access the 'quantity' field of that array before trying to add the new quantity value to it.
One of the reasons why your code is not working is that you're using the animal name as the array index, not the integer index which is used in your desired output.
Try this:
$new = array(); // Desired output
$map = array(); // Map animal names to index in $new
$idx = 0; // What is the next index we can use
foreach ($original as $entity) {
$animal = $entity['animal'];
// If we haven't saved the animal yet, put it in the $map and $new array
if(!isset($map[$animal])) {
$map[$animal] = $idx++;
$new[$map[$animal]] = $entity;
}
else {
$new[$map[$animal]]['quantity'] += $entity['quantity'];
}
}
This works:
$new = array();
$seen = array();
foreach($original as $entity) {
// If this is the first time we're encountering the animal
if (!in_array($entity['animal'], $seen)) {
$new[] = $entity;
$seen[] = $entity['animal'];
// Otherwise, if this animal is already in the new array...
} else {
// Find the index of the animal in the new array...
foreach($new as $index => $new_entity) {
if ($new_entity['animal'] == $entity['animal']) {
// Add to the quantity
$new[$index]['quantity'] += $entity['quantity'];
}
}
}
}
Your example was using the animal name as the index, yet the actual index is just an integer.
However, I think the resulting array would be easier to use and easier to read if it was formatting like this instead:
array('cats' => 4, 'dogs' => 1)
That would require different but simpler code than above... but, it wouldn't be a direct response to your question.