I have list of unique elements and want to change it to list of associative arrays. What is the most elegant way to do this? I tried foreach but it looks bogus.
Expected Input:
array('2019-10-01', '2019-10-02', '2019-10-03')
Expected Output:
array(array('day' => '2019-10-01'), array('day' => '2019-10-02'), array('day' => '2019-10-03'))
You can use array_map:
$array = array('2019-10-01', '2019-10-02', '2019-10-03');
$output = array_map(function ($v) { return array('day' => $v); }, $array);
or a simple foreach:
$output = array();
foreach ($array as $v) {
$output[] = array('day' => $v);
}
In both cases the output is the same:
Array
(
[0] => Array
(
[day] => 2019-10-01
)
[1] => Array
(
[day] => 2019-10-02
)
[2] => Array
(
[day] => 2019-10-03
)
)
Demo on 3v4l.org
See this short code example. it iterates over the given array and associates a key with an increment:
$a = Array('2019-10-01', '2019-10-02', '2019-10-03');
$b = [];
for($x = 0; $x < count($a); $x++) {
$b['day' . $x] = $a[$x];
}
print_r($b);
// output: Array ( [day0] => 2019-10-01 [day1] => 2019-10-02 [day2] => 2019-10-03 )
Related
I have this array:
Array
(
[0] => Array
(
[0] => 1
[1] => a,b,c
)
[1] => Array
(
[0] => 5
[1] => d,e,f
)
)
I want the final array to be this:
Array
(
[0] => Array
(
[0] => 1
[1] => a
)
[1] => Array
(
[0] => 1
[1] => b
)
[2] => Array
(
[0] => 1
[1] => c
)
[3] => Array
(
[0] => 5
[1] => d
)
[4] => Array
(
[0] => 5
[1] => e
)
[5] => Array
(
[0] => 5
[1] => f
)
)
This is what I did:
<?php
$array = array(array(1,"a,b,c"),array(5,"d,e,f"));
$temp=array();
$count = 0;
foreach($array as $arr){
$rows = explode(",",$arr[1]);
foreach($rows as $row){
$temp[$count] = $arr;
$temp[$count][1] = $row;
$count++;
}
}
print_r($temp);
?>
This totally works but I was wondering if there was a better way to do this. This can be very slow when I have huge data.
Try like this way...
<?php
$array = array(array(1,"a,b,c"),array(5,"d,e,f"));
$temp=array();
$count = 0;
foreach($array as $arr){
$rows = explode(",",$arr[1]);
foreach($rows as $row){
$temp[$count][] = $arr[0];
$temp[$count][] = $row;
$count++;
}
}
/*print "<pre>";
print_r($temp);
print "<pre>";*/
?>
Here's a functional approach:
$result = array_merge(...array_map(function(array $a) {
return array_map(function($x) use ($a) {
return [$a[0], $x];
}, explode(",", $a[1]));
}, $array));
Try it online.
Or simply with two loops:
$result = [];
foreach ($array as $a) {
foreach (explode(",", $a[1]) as $x) {
$result[] = [$a[0], $x];
}
}
Try it online.
Timing these reveals that a simple loop construct is ~8 times faster.
functional: 4.06s user 0.08s system 99% cpu 4.160 total
loop: 0.53s user 0.05s system 102% cpu 0.561 total
If you need other way around,
$array = array(array(1, "a,b,c"), array(5, "d,e,f"));
$temp = [];
array_walk($array, function ($item, $key) use (&$temp) {
$second = explode(',', $item[1]);
foreach ($second as $v) {
$temp[] = [$item[0], $v];
}
});
print_r($temp);
array_walk — Apply a user supplied function to every member of an array
Here is working demo.
I have an array that looks like this:
array
(
[name] => name
[description] => description here
[first] => Array
(
[0] => weight
[1] => height
)
[second] => Array
(
[0] => 20 kg
[1] => 50 cm
)
[company_id] => 1
[category_id] => 7
)
what function will allow me to combine these into something that looks like the following?
array
(
[together]
(
[0] => weight 20kg
[1] => height 50cm
)
)
Update
For that current array you need to use the loop.
$first = $second = array();
foreach($yourArray as $key => $array) {
if(in_array($key, array('first', 'second')) {
$first[] = $array[0];
$second[] = $array[1];
}
}
$final['together'] = array($first, $second);
According to the first array
You can try this -
$new = array(
'together' => array(
implode(' ', array_column($yourArray, 0)), // This would take out all the values in the sub arrays with index 0 and implode them with a blank space
implode(' ', array_column($yourArray, 1)), // Same as above with index 1
)
);
array_column is supported PHP >= 5.5
Or you can try -
$first = $second = array();
foreach($yourArray as $array) {
$first[] = $array[0];
$second[] = $array[1];
}
$final['together'] = array($first, $second);
you also can try array_map as below
function merge($first,$second)
{
return $first ." ".$second;
}
$combine = array_map('merge', $yourArray[0],$yourArray[1]);
I have the following array defined.
$a = Array
(
[0] => 30:27
[1] => 29:28
[2] => 30:27
)
$b = Array
(
[0] => 102186
[3] => 102991
[4] => 102241
)
I have used array_map($a,$b); But not what i want the result comes.
Always first to first key, second to second key, third to third key, I expect the following result...
$ab = $b = Array
(
[0] => 102186 [30:27]
[1] => 102991 [29:28]
[2] => 102241 [30:27]
)
Edit:
If the array keys doesn't match (thought it was a typo), then just reset the arrays by using $a = array_values($a) and $b = array_values($b) like this:
$a = array(
0 => "30:27",
1 => "29:28",
2 => "30:27"
);
$b = array(
0 => "102186",
3 => "102991",
4 => "102241"
);
// Reset keys
$a = array_values($a);
$b = array_values($b);
$ab = array();
for ($i=0; $i < count($a); $i++) {
$ab[] = "{$b[$i]} [{$a[$i]}]";
}
echo "<pre>";
print_r($ab);
echo "</pre>";
Outputs:
Array
(
[0] => 102186 [30:27]
[1] => 102991 [29:28]
[2] => 102241 [30:27]
)
Just loop over the 1st array and add the corresponding value from the 2nd one. You can actually use array_map for this:
$ab = array_map(function($aVal, $bVal){
return "$bVal [$aVal]";
}, $a, $b);
DEMO: https://eval.in/78684
USE:
$arrayFirst and $arraySecond - your input arrays;
$result = array();
for ($i=0; $i < count($arrayFirst); $i++) {
$result[] = "{$arraySecond[$i]} [{$arrayFirst[$i]}]";
}
var_dump ($result);
Or array_merge_recursive()
$array = array_merge_recursive($array1, $array2);
I have an 2d array which returns me this values:
Array (
[0] => Array (
[0] => wallet,pen
[1] => perfume,pen
)
[1] => Array (
[0] => perfume, charger
[1] => pen,book
).
Out of this i would like to know if it is possible to create a function which would combine the array going this way,and create a new one :
if for example [0] => Array ( [0] => wallet,pen [1] => perfume,pen ) then should be equal to
[0] => Array ( [0] => wallet,pen, perfume ) because there is a common word else do nothing.
And also after that retrieve each words as strings for further operations.
How can i make the values of such an array unique. Array ( [0] => Array ( [0] => wallet [1] => pen [2] => perfume [3] => pen) ) as there is pen twice i would like it to be deleted in this way ( [0] => Array ( [0] => wallet [1] => pen [2] => perfume) )
It's just a matter of mapping the array and combining the inner arrays:
$x = [['wallet,pen', 'perfume,pen'], ['perfume,charger', 'pen,book']];
$r = array_map(function($item) {
return array_unique(call_user_func_array('array_merge', array_map(function($subitem) {
return explode(',', $subitem);
}, $item)));
}, $x);
Demo
This first splits all the strings based on comma. They are then merged together with array_merge() and the duplicates are removed using array_unique().
See also: call_user_func_array(), array_map()
Try this :
$array = Array (Array ( "wallet,pen", "perfume,pen" ), Array ( "perfume, charger", "pen,book" ));
$res = array();
foreach($array as $key=>$val){
$temp = array();
foreach($val as $k=>$v){
foreach(explode(",",$v) as $vl){
$temp[] = $vl;
}
}
if(count(array_unique($temp)) < count($temp)){
$res[$key] = implode(",",array_unique($temp));
}
else{
$res[$key] = $val;
}
}
echo "<pre>";
print_r($res);
output :
Array
(
[0] => wallet,pen,perfume
[1] => Array
(
[0] => perfume, charger
[1] => pen,book
)
)
You can eliminate duplicate values while pushing them into your result array by assigning the tag as the key to the element -- PHP will not allow duplicate keys on the same level of an array, so any re-encountered tags will simply be overwritten.
You can use recursion or statically written loops for this task.
Code: (Demo)
$result = [];
foreach ($array as $row) {
foreach ($row as $tags) {
foreach (explode(',', $tags) as $tag) {
$result[$tag] = $tag;
}
}
}
var_export(array_values($result));
Code: (Demo)
$result = [];
array_walk_recursive(
$array,
function($v) use(&$result) {
foreach (explode(',', $v) as $tag) {
$result[$tag] = $tag;
}
}
);
var_export(array_values($result));
I know there's a ton of answers but I can't seem to get it right. I have the following arrays and what I've tried:
$a = array ( 0 => '1421' , 1 => '2241' );
$b = array ( 0 => 'teststring1' , 1 => 'teststring2' );
$c = array ( 0 => 'teststring3' , 1 => 'teststring4' );
$d = array ( 0 => 'teststring5' , 1 => 'teststring6' );
$e = array_combine($a, array($b,$c,$d) );
But with this I get the error array_combine() [function.array-combine]: Both parameters should have an equal number of elements.
I know it's because the $a's array values aren't keys. That's why I'm coming here to see if I could get some help with an answer that can help me make it look something like this:
array(2) {
[1421]=>array( [0] => teststring1
[1] => teststring3
[2] => teststring5
)
[2241]=>array( [0] => teststring2
[1] => teststring4
[2] => teststring6
)
}
If you have control over creating the arrays, you should create them like:
$a = array ('1421' ,'2241');
$b = array ('teststring1', 'teststring3', 'teststring5');
$c = array ('teststring2', 'teststring4', 'teststring6');
$e = array_combine($a, array($b,$c) );
If not, you have to loop over them:
$result = array();
$values = array($b, $c, $d);
foreach($a as $index => $key) {
$t = array();
foreach($values as $value) {
$t[] = $value[$index];
}
$result[$key] = $t;
}
DEMO
Here is a one-liner in a functional coding style. Calling array_map() with a null function parameter followed by the "values" arrays will generate the desired subarray structures. array_combine() does the key=>value associations.
Code (Demo)
var_export(array_combine($a, array_map(null, $b, $c, $d)));
Output:
array (
1421 =>
array (
0 => 'teststring1',
1 => 'teststring3',
2 => 'teststring5',
),
2241 =>
array (
0 => 'teststring2',
1 => 'teststring4',
2 => 'teststring6',
),
)
Super clean, right? I know. It's a useful little trick when you don't have control of the initial array generation step.
Here's a new version of array_merge_recursive which will handle integer keys. Let know how it goes.
$a = array ( 0 => '1421' , 1 => '2241' );
$b = array ( 0 => 'teststring1' , 1 => 'teststring2' );
$c = array ( 0 => 'teststring3' , 1 => 'teststring4' );
$d = array ( 0 => 'teststring5' , 1 => 'teststring6' );
$e = array_combine($a, array_merge_recursive2($b, $c, $d));
echo "<pre>";
print_r($e);
function array_merge_recursive2() {
$args = func_get_args();
$ret = array();
foreach ($args as $arr) {
if(is_array($arr)) {
foreach ($arr as $key => $val) {
$ret[$key][] = $val;
}
}
}
return $ret;
}