Change value within array based on input in php - php

Question

I am trying to locale the correct sub-array in order to change the count, if a specific value is present more than once.
I have the following code:
$trending = [];
foreach($hashtags as $hashtag) {
if(in_array($hashtag->hashtag, $hashtags))
{
array_search()
}
else {
array_push($trending, [
'hashtag' => $hashtag->hashtag,
'counts' => '1'
]);
}
}
This gives me the following example outout:
array(3) {
[0]=> array(2)
{
["hashtag"]=> "foobar"
["counts"]=> "1"
}
[1]=> array(2)
{
["hashtag"]=> "hashtags"
["counts"]=> "1"
}
[2]=> array(2)
{
["hashtag"]=> "imageattached"
["counts"]=> "1"
}
}
So in the foreach loop and the if statement, i want to check for dublicates of hashtags, e.g. if the hashtag foobar exists more than one time, I don't want to create another dublicate in the array, but I want to change the count to 2
How do I find the correct "sub"-array, and change the count of this to 2, if a hashtag is present within $hashtags more than once??
The idea is, that I at the end can sort these arrays, and get the hashtag that is most common, by looking at the count.

Answer 1

If you change the structure of your output, you could do something like this:
$trending = [];
foreach($hashtags as $tag) {
if (isset($trending[$tag])) $trending[$tag]++;
else $trending[$tag] = 1;
}
Which would result in $trending having the structure
array(2) {
["foobar"] => 1,
["hashtags"] => 2
}
Which could then be looped through with
foreach($trending as $tag => $count) {
echo $tag . ' appears ' . $count . ' times.' . PHP_EOL;
}

Answer 2

The PHP method array_count_values might be of some help.
http://php.net/manual/en/function.array-count-values.php

Answer 3

Have you considered using a keyed array?
$trending = array();
foreach($hashtags as $hashtag) {
if(!isset($trending[$hashtag])){
$trending[$hashtag] = 1;
}else{
$trending[$hashtag] += 1;
}
}
By using a keyed array, there is no duplication and you can easily check how frequently a hashtag is used by just accessing $trending[$hashtag]. Additionally, you can get the list of all hashtags in the trending array using $allHashtags = array_keys($trending);.
Of course, if your project specifications do not allow for this, then by all means, use a different approach, but that would be the approach I would take.

Answer 4

It can be more linear of you can change your array structure but for the current this should work.
$trending = [];
$checker = true;
foreach($hashtags as $hashtag) {
foreach ($trending as $key =>$value) {
if($value["hashtag"] == $hashtag->hashtag){
$trending[$key]["counts"]++;
$checker = false;
}
}
if($checker) {
array_push($trending, [
'hashtag' => $hashtag->hashtag,
'counts' => '1'
]);
}
$checker = true;
}