apologies if this is a simple fix - I'm having trouble passing a few arrays in PHP.
I have two arrays setup eg:
$person = array(
'height' => 100,
'build' => "average",
'waist' => 38,
);
$hobbies = array(
'climbing' => true,
'skiing' => false,
'waist' => 38,
);
now if I perform a print_r() on these arrays they return results as expected.I then insert the 2 arrays into a new array as seen below:
$total = array($person, $hobbies);
using print_r once again returns a new array containing both arrays but it is not associative. However if I try to do the following:
$total = array(
'person' <= $person,
'hobbies' <= $hobbies,
);
and I perform a print_r on $total using the code above I am not seeing both arrays with associations. ^ the above data is just an example data but identical in structure in my real app, I get returned the following result:
Array ( [0] => 1 [1] => 1 )
Once again apologies if I am being extremely thick - which I have a feeling I am.
It sounds like you want the $total array to have person and hobbies keys for the sub-arrays. If so, simply do this:
$total = array("person" => $person, "hobbies" => $hobbies);
Example with output: http://3v4l.org/5U5Hh
Your array assignments are the wrong way round: 'person' <= $person should be 'person' => $person.
// Wrong
$total = array(
'person' <= $person,
'hobbies' <= $hobbies,
);
// Right
$total = array(
'person' => $person,
'hobbies' => $hobbies,
);
You need to use array_merge, if you want to merge both array into a new array.
$result = array_merge($person, $hobbies);
Related
I have a large multidimensional array that looks like the below.
I want to remove duplicate arrays based on the ID, however, I am struggling to achieve this.
I want the duplicates to work over the entire array, so you can see that ID 1229873 is a duplicate, in the array 2021-07-07 and 2021-07-09, it should therefore be removed from 2021-07-09
How would I achieve this? array_unique has not worked for me.
$data = array (
'2021-07-07' =>
array (
0 =>
array (
'id' => 5435435,
'homeID' => 8754,
'match_url' => '/usa/reading-united-ac-vs-ocean-city-noreasters-fc-h2h-stats#1229873',
'competition_id' => 5808,
'matches_completed_minimum' => 12,
),
1 =>
array (
'id' => 1229873,
'homeID' => 8754,
'match_url' => '/usa/reading-united-ac-vs-ocean-city-noreasters-fc-h2h-stats#1229873',
'competition_id' => 5808,
'matches_completed_minimum' => 12,
),
),
'2021-07-09' =>
array (
0 =>
array (
'id' => 3243234,
'homeID' => 8754,
'match_url' => '/usa/reading-united-ac-vs-ocean-city-noreasters-fc-h2h-stats#1229873',
'competition_id' => 5808,
'matches_completed_minimum' => 12,
),
1 =>
array (
'id' => 1229873,
'homeID' => 8754,
'match_url' => '/usa/reading-united-ac-vs-ocean-city-noreasters-fc-h2h-stats#1229873',
'competition_id' => 5808,
'matches_completed_minimum' => 12,
),
),
);
This is a perfect case for array_uunique()! No wait, scratch that. The PHP devs refused to implement it for the perfectly valid reason of... [shuffles notes] "the function name looks like a typo".
[sets notes on fire]
Anyhow, you just need to iterate over that data, keep track of the IDs you've seen, and remove entries that you've already seen.
$seen = [];
foreach(array_keys($data) as $i) {
foreach(array_keys($data[$i]) as $j) {
$id = $data[$i][$j]['id'];
if( in_array($id, $seen) ) {
unset($data[$i][$j]);
} else {
$seen[] = $id;
}
}
}
I've opted for the foreach(array_keys(...) as $x) approach as avoiding PHP references is always the sane choice.
Run it.
I am Sure That is the way which you want to get the unique array.
$unique = array_map("unserialize", array_unique(array_map("serialize", $data)));
echo "<pre>";
print_r($unique);
echo "</pre>";
I want to insert data in table 'projects'. I have two arrays with different sizes, they are
$advisor_id = array(
'id' =>1
'id' =>2
'id' =>3
);
$project_id = array(
'pid'=>1
'pid'=>2
'pid'=>3
'pid'=>4
);
My code is:
$advisors = count($this->input->post('advisor_id[]'));
$PM_ids = count($this->input->post('PM_id[]'));
if($advisors > $PM_ids){
$count = $advisors;
}else{
$count = $PM_ids;
}
$data[] = array();
for($i =0; $i<$count ; $i++){
$data = array(
'advisor_id' =>$this->input->post('advisor_id')[$i],
'PM_id' =>$this->input->post('PM_id')[$i],
);
//print_r($data);
$this->db->insert_batch('project_config',$data);
}
My problem is the different sizes of arrays. How can I insert into database.
If you are happy to submit NULL values where missing, array_map() is the best tool for the job.
First a general demonstration of how/where NULL elements are generated when array size mismatches occur...
Code: (Demo)
$advisor_id=['id1'=>1,'id2'=>2,'id3'=>3];
$project_id=['pid1'=>1,'pid2'=>2,'pid3'=>3,'pid4'=>4];
$data=array_map(function($id,$pid){return ['advisor_id'=>$id,'PM_id'=>$pid];},$advisor_id,$project_id);
var_export($data); // see how NULL elements are formed in the output array
Output:
array (
0 =>
array (
'advisor_id' => 1,
'PM_id' => 1,
),
1 =>
array (
'advisor_id' => 2,
'PM_id' => 2,
),
2 =>
array (
'advisor_id' => 3,
'PM_id' => 3,
),
3 =>
array (
'advisor_id' => NULL,
'PM_id' => 4,
),
)
The above multi-dimensional array is now fully prepared for a single insert_batch() call. IMPORTANT CodeIgniter's insert_batch() is specifically designed to INSERT multiple rows of data at once -- to use this call inside of a loop defeats the purpose of making this call.
As for you actual implementation, this should work (I don't code in CodeIgniter):
$data=array_map(function($id,$pid){return ['advisor_id'=>$id,'PM_id'=>$pid];},$this->input->post('advisor_id'),$this->input->post('PM_id'));
$this->db->insert_batch('project_config',$data);
CLEAN & DONE: No for loops, no $i counters, and just one call to the database.
It is possible to put an array into a multi dim array? I have a list of user settings that I want to return in a JSON array and also have another array stored in that JSON array...what is the best way to do that if it isn't possible?
A multi dimension is already an array inside an array. So there's nothing stopping you from putting another array in there. Sort of like dreams within dreams :P
Just use associative arrays if you want to give your array meaning
array(
'SETTINGS' => array(
'arr1' => array( 0, 1),
'arr2' => array( 0, 1)
),
'DATA' => array(
'arr1' => array( 0, 1),
'arr2' => array( 0, 1)
)
)
EDIT
To answer your comment, $output_files[$file_id]['shared_with'] = $shared_info; translates to (your comment had an extra ] which I removed)
$shared_info = array(1, 2, 3);
$file_id = 3;
$output_files = array(
'3' => array(
'shared_with' => array() //this is where $shared_info will get assigned
)
);
//you don't actually have to declare it an empty array. I just did it to demonstrate.
$output_files[$file_id]['shared_with'] = $shared_info; // now that empty array is replaced.
any array key can have an array value in php, as well as in json.
php:
'key' => array(...)
json:
"key" : [...]
note: php doesn't support multidimensional arrays as in C or C++. it's just an array element containing another array.
What do
$categories[$id] = array('name' => $name, 'children' => array());
and
$categories[$parentId]['children'][] = array('id' => $id, 'name' => $name);
mean?
Thanks a lot.
How should i format the output so i can learn the results that was returned?
You can format your code into tables by looping on the array using for or foreach. Read the docs for each if you don't have a grasp on looping.
2.What does
$categories[$id] = array('name' => $name, 'children' => array());
and
$categories[$parentId]['children'][] = array('id' => $id, 'name' => $name);
The first line assigns an associative array to another element of the $categories array. For instance if you wanted the name of the category with ID of 6 it would look like this:
$categories[6]['name']
The second line does something similar, except when you are working with an array in PHP, you can use the [] operator to automatically add another element to the array with the next available index.
What is the uses of .= ?
This is the concatenation assignment operator. The following two statements are equal:
$string1 .= $string2
$string1 = $string1 . $string2
These all have to do with nesting arrays.
first example:
$categories[$id] = array('name' => $name, 'children' => array());
$categories is an array, and you are setting the key id to contain another array, which contains name and another array. you could accomplish something similar with this:
$categories = array(
$id => array(
'name' => $name,
'children' => array()
)
)
The second one is setting the children array from the first example. when you have arrays inside of arrays, you can use multiple indexes. It is then setting an ID and Name in that array. here is a another way to look at example #2:
$categories = array(
$parentID => array(
'children' => array(
'id' = $id,
'name' => $name
)
)
)
note: my two ways of rewriting are functionally identical to what you posted, I'm just hoping this makes it easier to visualize what's going on.
I would like to retrieve the first key from this multi-dimensional array.
Array
(
[User] => Array
(
[id] => 2
[firstname] => first
[lastname] => last
[phone] => 123-1456
[email] =>
[website] =>
[group_id] => 1
[company_id] => 1
)
)
This array is stored in $this->data.
Right now I am using key($this->data) which retrieves 'User' as it should but this doesn't feel like the correct way to reach the result.
Are there any other ways to retrieve this result?
Thanks
There are other ways of doing it but nothing as quick and as short as using key(). Every other usage is for getting all keys. For example, all of these will return the first key in an array:
$keys=array_keys($this->data);
echo $keys[0]; //prints first key
foreach ($this->data as $key => $value)
{
echo $key;
break;
}
As you can see both are sloppy.
If you want a oneliner, but you want to protect yourself from accidentally getting the wrong key if the iterator is not on the first element, try this:
reset($this->data);
reset():
reset() rewinds array 's internal
pointer to the first element and
returns the value of the first array
element.
But what you're doing looks fine to me. There is a function that does exactly what you want in one line; what else could you want?
Use this (PHP 5.5+):
echo reset(array_column($this->data, 'id'));
I had a similar problem to solve and was pleased to find this post. However, the solutions provided only works for 2 levels and do not work for a multi-dimensional array with any number of levels. I needed a solution that could work for an array with any dimension and could find the first keys of each level.
After a bit of work I found a solution that may be useful to someone else and therefore I included my solution as part of this post.
Here is a sample start array:
$myArray = array(
'referrer' => array(
'week' => array(
'201901' => array(
'Internal' => array(
'page' => array(
'number' => 201,
'visits' => 5
)
),
'External' => array(
'page' => array(
'number' => 121,
'visits' => 1
)
),
),
'201902' => array(
'Social' => array(
'page' => array(
'number' => 921,
'visits' => 100
)
),
'External' => array(
'page' => array(
'number' => 88,
'visits' => 4
)
),
)
)
)
);
As this function needs to display all the fist keys whatever the dimension of the array, this suggested a recursive function and my function looks like this:
function getFirstKeys($arr){
$keys = '';
reset($arr);
$key = key($arr);
$arr1 = $arr[$key];
if (is_array($arr1)){
$keys .= $key . '|'. getFirstKeys($arr1);
} else {
$keys = $key;
}
return $keys;
}
When the function is called using the code:
$xx = getFirstKeys($myArray);
echo '<h4>Get First Keys</h4>';
echo '<li>The keys are: '.$xx.'</li>';
the output is:
Get First Keys
The keys are: referrer|week|201901|Internal|page|number
I hope this saves someone a bit of time should they encounter a similar problem.