array combine three or more arrays with php [duplicate] - php

Question

This question already has answers here:
Two arrays in foreach loop
(24 answers)
Closed 6 months ago.
ok, assuming I have 5 arrays, all just indexed arrays, and I would like to combine them, this is the best way I can figure, is there a better way to handle this?
function mymap_arrays(){
$args=func_get_args();
$key=array_shift($args);
return array_combine($key,$args);
}
$keys=array('u1','u2','u3');
$names=array('Bob','Fred','Joe');
$emails=array('bob#mail.com','fred#mail.com','joe#mail.com');
$ids=array(1,2,3);
$u_keys=array_fill(0,count($names),array('name','email','id'));
$users=array_combine($keys,array_map('mymap_arrays',$u_keys,$names,$emails,$ids));
this returns:
Array
(
[u1] => Array
(
[name] => Bob
[email] => bob#mail.com
[id] => 1
)
[u2] => Array
(
[name] => Fred
[email] => fred#mail.com
[id] => 2
)
[u3] => Array
(
[name] => Joe
[email] => joe#mail.com
[id] => 3
)
)
EDIT: After lots of benchmarking I wend with a version of Glass Robots answer to handle a variable number of arrays, it's slower than his obviously, but faster than my original:
function test_my_new(){
$args=func_get_args();
$keys=array_shift($args);
$vkeys=array_shift($args);
$results=array();
foreach($args as $key=>$array){
$vkey=array_shift($vkeys);
foreach($array as $akey=>$val){
$result[$keys[$akey]][$vkey]=$val;
}
}
return $result;
}
$keys=array('u1','u2','u3');
$names=array('Bob','Fred','Joe');
$emails=array('bob#mail.com','fred#mail.com','joe#mail.com');
$ids=array(1,2,3);
$vkeys=array('name','email','id');
test_my_new($keys,$vkeys,$names,$emails,$ids);

Answer 1

Personally for readability I would do it this way:
$keys = array('u1','u2','u3');
$names = array('Bob','Fred','Joe');
$emails = array('bob#mail.com','fred#mail.com','joe#mail.com');
$ids = array(1,2,3);
$result = array();
foreach ($keys as $id => $key) {
$result[$key] = array(
'name' => $names[$id],
'email' => $emails[$id],
'id' => $ids[$id],
);
}

Answer 2

I did not check the efficiency, but in my solution I am using only standard functions (they should be optimized) without custom mapping and looping outside them:
// assigning the data from your question
$keys = array('u1','u2','u3');
$names = array('Bob','Fred','Joe');
$emails = array('bob#mail.com','fred#mail.com','joe#mail.com');
$ids = array(1,2,3);
// creating resulting array
$result = array_merge_recursive(
array_combine($keys, $names),
array_combine($keys, $emails),
array_combine($keys, $ids)
);
Did you try this solution?

Answer 3

Here's basically a one-liner for a set number of elements:
$combined = array_combine($keys, array_map(function ($id, $name, $email) {
return compact('id', 'name', 'email');
}, $ids, $names, $emails));
And here a version for PHP 5.2- without anonymous functions:
$combined = array_combine($keys, array_map(create_function('$id, $name, $email',
'return compact("id", "name", "email");'
), $ids, $names, $emails));
For a variable number of elements, it'll look like this:
function combineValues($keys, $values) {
$vKeys = array_keys($values);
return array_combine($keys, array_map(
function ($values) use ($vKeys) { return array_combine($vKeys, $values); },
call_user_func_array('array_map', array_merge(
array(function () { return func_get_args(); }),
$values))));
}
$combined = combineValues($keys, array('name' => $names, 'email' => $emails, 'id' => $ids));
I have to admit that looks pretty cryptic, so here's an expanded version:
function combineValues($keys, $values) {
$valueKeys = array_keys($values);
$combinedValues = call_user_func_array('array_map', array_merge(array(function () { return func_get_args(); }), $values));
$combinedValues = array_map(function ($values) use ($valueKeys) { return array_combine($valueKeys, $values); }, $combinedValues);
return array_combine($keys, $combinedValues);
}
For PHP 5.2- this may look like this:
function combineValues($keys, $values) {
$result = call_user_func_array('array_map', array_merge(
array(create_function('', 'return func_get_args();')),
$values));
array_walk($result,
create_function('&$val, $i, $keys', '$val = array_combine($keys, $val);'),
array_keys($values));
return array_combine($keys, $result);
}

Answer 4

Simply try this for multiples array combine (if you have length of arrays)
$array_id = array ('1', '2', '3');
$array1 = array ('arr1_value1', 'arr1_value2', 'arr1_value3');
$array2 = array ('arr2_value1', 'arr2_value2', 'arr2_value3');
$array3 = array ('arr3_value1', 'arr3_value2', 'arr3_value3');
$lenght = count($array_id);
$i = 0;
while ($i < $lenght) {
$result[] = array(
$array_id[$i]
, $array1[$i]
, $array2[$i]
, $array3[$i]
);
$i++;
}
echo '<pre>';
print_r($result);