I have a very simple array like this:
Array ( [friend_id] => 180 [user_id] => 175 )
What I want to do is just to switch the values, in order to be come this:
Array ( [friend_id] => 175 [user_id] => 180 )
Is there any elegant NON STATIC way in PHP to do it?
you can use array_combine and array_reverse
$swapped = array_combine(array_keys($arr), array_reverse(array_values($arr)));
No. Use a temporary value:
$temp = $array['friend_id'];
$array['friend_id'] = $array['user_id'];
$array['user_id'] = $temp;
A bit longish, but I think it satisfies you requirements for 2 element arrays, just as you used in your example:
// your input array = $yourarray;
$keyarray = array_keys($yourarray);
$valuearray = array_values($yourarray);
/// empty input array just to make sure
$yourarray = array();
$yourarray[$keyarray[0]] = $valuearray[1];
$yourarray[$keyarray[1]] = $valuearray[0];
Basically Orangepill's answer done manually...
How about using array_flip?
array array_flip ( array $trans )
$myar = array('apples', 'oranges', 'pineaples'); print_r($myar);
print_r(array_flip($myar));
Array
(
[0] => apples
[1] => oranges
[2] => pineaples
)
Array
(
[apples] => 0
[oranges] => 1
[pineaples] => 2
)
$tmp = $array['user_id'];
$array['user_id'] = $array['friend_id'];
$array['friend_id'] = $tmp;
Related
Assuming that I have an array of objects like this:
Array
(
[0] => stdClass Object
(
[id] => 10-423-1176
[qty] => 2
[price] => 12.6
)
[1] => stdClass Object
(
[id] => 26-295-1006
[qty] => 24
[price] => 230.35
)
[2] => stdClass Object
(
[id] => 12-330-1000
[qty] => 2
[price] => 230.35
)
And I have another array of object hat looks like this:
Array
(
[0] => Item Object
(
[internalId] => 14062
[itemVendorCode] => 89-605-1250
)
[1] => Item Object
(
[internalId] => 33806
[itemVendorCode] => 89-575-2354
)
[2] => Item Object
(
[internalId] => 64126
[itemVendorCode] => 26-295-1006
)
)
I want to loop through the 2nd array of objects and get the 'itemVendorCode' and then use it as the 'id' to get the object from the first array of objects. Is there a way to obtain what I want without looping the first array? Looping is very costly in my use-case.
You will have to use loops in any case, even if those loops are hidden within PHP built-in functions.
For instance:
$codes = array_map(function ($item) { return $item->itemVendorCode; }, $array2);
$items = array_filter($array1, function ($item) use ($codes) { return in_array($item->id, $codes); });
// $items contains only elements from $array1 that match on $array2
If this will be more efficient than using regular loops is hard to tell.
Since you are aparently trying to code what is supposed to be a DBMS's job, I recommend you export those tables to a database server such as MySQL instead and let it work its magic on those "JOINs".
Answering your comment, you could merge with something like this:
$result = array();
foreach ($array1 as $item1)
foreach ($array2 as $item2)
if ($item1->id == $item2->itemVendorCode)
$result[] = (object)array_merge((array)$item1, (array)$item2));
$result will contain a new set of objects that merge properties from both $array1 and $array2 where they intersect in id == itemVendorCode.
Do you need first arrays index keys? if not you could iterate throuh first array once and set key to id. Something like:
foreach ($items as $key => $item) {
$items[$item->id] = $item;
unset($items[$key]);
}
Here is another direct approach to solve this problem, even better than the one I proposed earlier:
// you got the $itemVendorCode from looping through the second array, let say :
$itemVendorCode = "89-605-1250";
// I'm assuming that you converted the array of objects in into accessible multidimensional array
// so the $first_array would look like :
$first_array= array (
array (
"id" => "10-423-1176",
"qty" => 2,
"price" => 12.6
),
array (
"id" => "10-423-1176",
"qty" => 5,
"price" => 25
),
array (
"id" => "89-605-1250",
"qty" => 12,
"price" => 30
)
);
// Now you can filter the first array using
$filter = function ($player) use($itemVendorCode) {
return $player ['id'] == $itemVendorCode;
};
$filtered = array_filter ( $first_array, $filter );
// print the price of the matching filtered item
print $filtered[key($filtered)]['price'] ;
You can use the array_map and array_filter() function to achieve that.
Try with this code:
<?php
$first = array();
$first[0] = new stdClass;
$first[0]->id = '89-605-1250';
$first[0]->qty = 2;
$first[0]->price = 12.6;
$first[1] = new stdClass;
$first[1]->id = '89-575-2354';
$first[1]->qty = 24;
$first[1]->price = 230.35;
$last = array();
$last[0] = new stdClass;
$last[0]->internalId = 14062;
$last[0]->itemVendorCode = '89-605-1250';
$last[1] = new stdClass;
$last[1]->internalId = 33806;
$last[1]->itemVendorCode = '89-575-2354';
$ids = array_map(function($element){return $element->itemVendorCode;}, $last);
$to_find = $ids[0];
$object = array_filter($first, function($element){global $to_find; return $element->id == $to_find ? true: false;})[0];
print_r($object);
?>
Output:
stdClass Object
(
[id] => 89-605-1250
[qty] => 2
[price] => 12.6
)
try using array_search:
http://php.net/manual/en/function.array-search.php
foreach($array2 as $key=>$item) {
$firstArrayObjectKey = array_search($item['itemVendorCode'], $array1);
//... do something with the key $firstArrayObjectKey
}
In this case you'll need to loop through the first array to get the itemVendorCode.
Right after that you can use the itemValue you got from the previous process to search in a reduced array of the first object using array_reduce function:
http://php.net/manual/en/function.array-reduce.php
I have 5 different array whose structure is :-
Array ( [0] => http://www.php.net/200
)
Array ( [0] => http://www.php.net/?setbeta=1&beta=1302
)
Array ( [0] => http://www.php.net/downloads.php200
)
Array ( [0] => http://www.php.net/docs.php200
)
Array ( [0] => http://www.php.net/FAQ.php302
)
I need to merge these all in a single array whose structure would be like:-
Array ( [0] => http://www.php.net/200
[1] => http://www.php.net/?setbeta=1&beta=1302
[2] => http://www.php.net/downloads.php200
[3] => http://www.php.net/docs.php200
[4] => http://www.php.net/FAQ.php302
)
One thing i want to confirm that these arrays are forming inside a loop function and it could be of any number and also they have a single name i.e $array
Simplest is probably just array_merge().
$merged = array_merge( $ar1, $ar2, $ar3, $ar4, $ar5 );
Use array_merge.
$arr = array_merge($arr1,$arr2,$arr3,$arr4,$arr5);
Edit After seeing your comment, you are having multidimensional array.
$arr = array();
for($i = 0; $i < $old_arr; $i++) {
$arr[] = $old_arr[$i][0];
}
Use array_merge
$arr1=Array ( 0 => 'http://www.php.net/200');
$arr2=Array( 0 => 'http://www.php.net/?setbeta=1&beta=1302');
$arr3=Array( 0 => 'http://www.php.net/downloads.php200');
$merged=array_merge($arr1,$arr2,$arr3);
print_r($merged);
$newarray = array();
while ( is_array( array_get_function_here() ) )
{
$newarray = array_merge( $newarray, $array );
}
I would try that if you get the different arrays in a looping function.
The above $array is something that array_get_function_here() should return for the while loop validity check (if it returns and array, the while check runs as true). array_get_function_here() is just an example and should be some function that returns a value for $array.
I have this array:
$fields = $_GET['r'];
Which has some ids, for example:
Array (
[0] => 3134
[1] => 3135 )
and then I have this string in $tematiche:
3113,3120
How can I marge this string in the first array? Also, how can I remove the equals id (if any)?
Try,
$fields = array_unique(array_merge($fields,explode(",",$tematiche)));
echo "<pre>";
print_r($fields);
Try this :
$fields = $_GET['r'];
$string = '3113,3120';
$array = explode(",",$string);
$res_array = array_unique(array_merge($fields,$array));
echo "<pre>";
print_r($res_array);
Output :
Array (
[0] => 3134
[1] => 3135
[2] => 3113
[3] => 3120
)
A combination of explode(), array_merge() and array_unique() would be suitable.
// Make $tematiche into an array
$tematiche_array = explode(',', $tematiche);
// Merge the two arrays
$merged_array = array_merge($fields, $tematiche_array);
// Remove all duplicate values in the array
$unique_array = array_unique($merged_array);
Please try like this. This should work for you.
$a = explode(',', '3113,3120');
print_r(array_merge($fields,$a));
I have an array that is generated from a SQL query that I run. It looks like the following:
$arr[$i]['id'] = $id;
$arr[$i]['name'] = $name;
$arr[$i]['email'] = $email;
How can I get the unique values from the email column? I appreciate the help.
The best answer is :
array_unique(array_column($arr, 'email'))
Either filter it in your column using the DISTINCT method in MySQL, or use something like
$uniqueEmails = array();
foreach($arr as $array)
{
if(!in_array($array['email'], $uniqueEmails)
$uniqueEmails[] = $array['email'];
}
Since PHP 5.5, a new function called array_column() is also available.
You can use it following way:
$allEmails = array_column($arr, 'email');
$uniqueEmails = array_unique($allEmails);
Remove duplicates from array comparing a specific key
Consider the same array but id of 3rd index is different:
$all_array = Array
(
[0] => Array
(
[id] => 1
[value] => 111
)
[1] => Array
(
[id] => 2
[value] => 222
)
[2] => Array
(
[id] => 3
[value] => 333
)
[3] => Array
(
[id] => 4
[value] => 111
)
)
Now, both 1 & 4 have same values. So we want to remove any of them:
$unique_arr = array_unique( array_column( $all_array , 'value' ) );
print_r( array_intersect_key( $all_array, $unique_arr ) );
If you get the list sorted by email from SQL you can improve performance by looping through the array like Gareth does, but instead only compare current email address with the last inserted email address. Below is a code example for this:
$uniqueEmails = array();
$lastemail = '';
foreach($arr as $array)
{
if($array['email'] != $lastemail)
{
$uniqueEmails[] = $array['email'];
$lastemail = $array['email'];
}
}
I have an array that is structured like this:
[33] => Array
(
[time] => 1285571561
[user] => test0
)
[34] => Array
(
[time] => 1285571659
[user] => test1
)
[35] => Array
(
[time] => 1285571682
[user] => test2
)
How can I get the last value in the array, but maintaining the index [35]?
The outcome that I am looking for is this:
[35] => Array
(
[time] => 1285571682
[user] => test2
)
try to use
end($array);
$last = array_slice($array, -1, 1, true);
See http://php.net/array_slice for details on what the arguments mean.
P.S. Unlike the other answers, this one actually does what you want. :-)
You can use end to advance the internal pointer to the end or array_slice to get an array only containing the last element:
$last = end($arr);
$last = current(array_slice($arr, -1));
If you have an array
$last_element = array_pop(array);
Example 1:
$arr = array("a"=>"a", "5"=>"b", "c", "key"=>"d", "lastkey"=>"e");
print_r(end($arr));
Output = e
Example 2:
ARRAY without key(s)
$arr = array("a", "b", "c", "d", "e");
print_r(array_slice($arr, -1, 1, true));
// output is = array( [4] => e )
Example 3:
ARRAY with key(s)
$arr = array("a"=>"a", "5"=>"b", "c", "key"=>"d", "lastkey"=>"e");
print_r(array_slice($arr, -1, 1, true));
// output is = array ( [lastkey] => e )
Example 4:
If your array keys like : [0] [1] [2] [3] [4] ... etc. You can use this:
$arr = array("a","b","c","d","e");
$lastindex = count($arr)-1;
print_r($lastindex);
Output = 4
Example 5:
But if you are not sure!
$arr = array("a"=>"a", "5"=>"b", "c", "key"=>"d", "lastkey"=>"e");
$ar_k = array_keys($arr);
$lastindex = $ar_k [ count($ar_k) - 1 ];
print_r($lastindex);
Output = lastkey
Resources:
https://php.net/array_slice
https://www.php.net/manual/en/function.array-keys.php
https://www.php.net/manual/en/function.count.php
https://www.php.net/manual/en/function.end.php
Like said Gumbo,
<?php
$fruits = array('apple', 'banana', 'cranberry');
echo end($fruits); // cranberry
?>
Another solution cold be:
$value = $arr[count($arr) - 1];
The above will count the amount of array values, substract 1 and then return the value.
Note: This can only be used if your array keys are numeric.
As the key is needed, the accepted solution doesn't work.
This:
end($array);
return array(key($array) => array_pop($array));
will return exactly as the example in the question.
"SPL-way":
$splArray = SplFixedArray::fromArray($array);
$last_item_with_preserved_index[$splArray->getSize()-1] = $splArray->offsetGet($splArray->getSize()-1);
Read more about SplFixedArray and why it's in some cases ( especially with big-index sizes array-data) more preferable than basic array here => The SplFixedArray class.