I have some arrays called
$array[1], $array[2] etc.
$array[1] is something like array(1,2,3) and $array[2] is sth. like array(2,3,4)
now I want to have alle numbers which are in all arrays.
I want to use
array_intersect($array[1],$array[2])
for this.
BUT I have maybe 2 or 3 or 4 of this array. Is it possible to create a string like
$list_of_array = $array[1],$array[2];
and make a
$result = array_intersect($list_of_arrays)
?
For such behaviour with variable amount of arrays, you can use call_user_func_array:
$array_list = array($array[1],$array[2],$array[3]);
$intersect = call_user_func_array('array_intersect',$aarray_list);
Test
$array_list = array(array(1,2,3), array(2,3,4,5), array(3,7,"a"));
$result = call_user_func_array('array_intersect',$array_list);
print_r($result);
Returns
Array ( [2] => 3 )
Yes, you can use call_user_func_array():
As the name suggests, you can use this function to call a user function and apply it with the parameters in the given array:
$result = call_user_func_array('array_intersect',$list_of_arrays);
Here, the first parameter is the name of the function callback, and second one is our array.
Assuming you have the $array filled with your input arrays, you can do:
$list_of_arrays = $array;
$result = call_user_func_array('array_intersect', $list_of_arrays);
Output:
Array
(
[2] => 3
)
Demo!
Related
If I had an array like this...
array('1','2','3','4','10')
... how could I remove elements before the element whose value I supply.
For example:
If I supplied 1 then array = (1,2,3,4,10)
If it were 2 then array = (2,3,4,10) //Remove the numbers before 2
If it were 3 then array = (3,4,10) //Remove the numbers before 3
If it were 4 then array = (4,10) //Remove the numbers before 4
If it were 10 then array = (10) //Remove all before the 10
I'm currently thinking of doing with using if else. But is there a way to do this using some kind of php array function itself.
Make use of array_search and array_slice
<?php
$arr=array_slice($arr, array_search('4',array('1','2','3','4','10')));
print_r($arr);
OUTPUT :
Array
(
[0] => 4
[1] => 10
)
Demo
Maybe this would help:
$myArray = array('1','2','3','4','10');
$x=3;
$myArray = array_splice($myArray, array_search($x, $myArray), count($myArray));
$myArray = array('1','2','3','4','10');
$value = 3;
$key = array_search($value, $myArray);
$myNewArray = array_splice($myArray, 0, $key);
$array = array_filter($array, function($item) use ($filterItem) {
return $item !== $filterItem;
});
Will filter out every item equal to $filterItem. array_filter on php.net
How can I delete duplicates in array?
For example if I had the following array:
$array = array('1','1','2','3');
I want it to become
$array = array('2','3');
so I want it to delete the whole value if two of it are found
Depending on PHP version, this should work in all versions of PHP >= 4.0.6 as it doesn't require anonymous functions that require PHP >= 5.3:
function moreThanOne($val) {
return $val < 2;
}
$a1 = array('1','1','2','3');
print_r(array_keys(array_filter(array_count_values($a1), 'moreThanOne')));
DEMO (Change the PHP version in the drop-down to select the version of PHP you are using)
This works because:
array_count_values will go through the array and create an index for each value and increment it each time it encounters it again.
array_filter will take the created array and pass it through the moreThanOne function defined earlier, if it returns false, the key/value pair will be removed.
array_keys will discard the value portion of the array creating an array with the values being the keys that were defined. This final step gives you a result that removes all values that existed more than once within the original array.
You can filter them out using array_count_values():
$array = array('1','1','2','3');
$res = array_keys(array_filter(array_count_values($array), function($freq) {
return $freq == 1;
}));
The function returns an array comprising the original values and their respective frequencies; you then pick only the single frequencies. The end result is obtained by retrieving the keys.
Demo
Try this code,
<?php
$array = array('1','1','2','3');
foreach($array as $data){
$key= array_keys($array,$data);
if(count($key)>1){
foreach($key as $key2 => $data2){
unset($array[$key2]);
}
}
}
$array=array_values($array);
print_r($array);
?>
Output
Array ( [0] => 2 [1] => 3 )
PHP offers so many array functions, you just have to combine them:
$arr = array_keys(array_filter(array_count_values($arr), function($val) {
return $val === 1;
}));
Reference: array_keys, array_filter, array_count_values
DEMO
Remove duplicate values from an array.
array_unique($array)
$array = array(4, "4", "3", 4, 3, "3");
$result = array_unique($array);
print_r($result);
/*
Array
(
[0] => 4
[2] => 3
)
*/
I have a comma separated string which i explode into an array. If the array is of un-known length and i want to make it into a key value pair array where each element in the array has the same key, how do i do this? i'm assuming i'd have to use array_combine? can anyone give me an example using the array bellow? :
for instance:
array([0]=>zebra, [1]=>cow, [2]=>dog, [3]=>monkey, [4]=>ape)
into:
array([animal]=>zebra, [animal]=>cow, [animal]=>dog, [animal]=>monkey, [animal]=>ape)
You can't use the same key for each element in your array. You need a unique identifier to access the value of the array. When you use animal for all, what value should be used? What you can do is to make a 2 dimensional array that you have an array inside an array:
array(
[animals] => array(
[0]=>zebra, [1]=>cow, [2]=>dog, [3]=>monkey, [4]=>ape
)
)
this can be used with $array['animals'][0]
But still you need numbers or unique identifiers to access the values of the array.
Something like this:
$string = 'zebra,cow,dog,monkey,ape';
$array = explode(',', $string);
$arrayReturn['animals'] = $array;
print_r($arrayReturn);
u cant have same key for all the values but u can do this
lets say your string is
$a = 'dog,ant,rabbit,lion';
$ar = explode(',',$a);
$yourArray = array();
foreach($ar as $animals){
$yourArray['animals']=$animals;
}
Now it doesnot matter how long your string is you will have you array as
$yourArray['animals'][0]='dog'
$yourArray['animals'][1]='ant'
....... so on ......
I have two arrays like this
$arr1 = Array('fn', 'ln', 'em');
$arr2 = Array('fn'=>'xyz', 'ano' => 'abc', 'ln'=>'122', 'em' => 'a#b.com', 'db'=>'xy');
I want to create an array from arr2 with all the elements from $arr1. So the result should be like this.
$result = Array( 'fn'=>'xyz', 'ln'=>'122', 'em'='a#b.com');
Don't want to loop.
Any idea?
The order of arguments is important here
print_r(array_intersect_key($arr2, array_flip($arr1)));
You can use array_map for this.
// PHP 5.3+ only
$result = array_combine($arr1, array_map(function($a) use($arr2){
return $arr2[$a];
}, $arr1));
DEMO: http://codepad.viper-7.com/Y1aYcf
If you have PHP < 5.3, you can do some trickery with array_intersect_key and array_flip.
$result = array_intersect_key($arr2, array_flip($arr1));
DEMO: http://codepad.org/MuydURQT
You just have to loop, as in create a new array or maybe check some array set in mathematics functions. I think, maybe, insection might work.
I don't want to use array_merge() as it results in i misunderstood that all values with the same keys would be overwritten. i have two arrays
$array1 = array(0=>'foo', 1=>'bar');
$array2 = array(0=>'bar', 1=>'foo');
and would like to combine them resulting like this
array(0=>'foo', 1=>'bar',2=>'bar', 3=>'foo');
array_merge() appends the values of the second array to the first. It does not overwrite keys.
Your example, results in:
Array (
[0] => foo
[1] => bar
[2] => bar
[3] => foo )
However, If the input arrays have the same string keys, then the later value for that key will overwrite the previous one. If, however, the arrays contain numeric keys, the later value will not overwrite the original value, but will be appended.
Unless this was just an example to another problem you were having?
Does this answer your question? I'm not sure exactly what you're trying to accomplish, but from your description it sounds like this will work:
$array1 = array(0=>'foo', 1=>'bar');
$array2 = array(0=>'bar', 1=>'foo');
foreach ($array2 as $i) {
$array1[] = $i;
}
echo var_dump($array1);
If someone stumbles upon this, this is a way to do it nowadays:
var_dump(array_merge_recursive($array1, $array2));
There are probably much better ways but what about:
$newarray= array();
$array1 = array(0=>'foo', 1=>'bar');
$array2 = array(0=>'bar', 1=>'foo');
$dataarrays = array($array1, $array2);
foreach($dataarrays as $dataarray) {
foreach($dataarray as $data) {
$newarray[] = $data;
}
}
print_r($newarray);
$result = array_keys(array_merge(array_flip($array1), array_flip($array2)));
var_dump($result);