Related
So I have this JSON Array:
[0] => 238
[1] => 7
[2] => 86
[3] => 79
[4] => 55
[5] => 92
[6] => 55
[7] => 7
[8] => 254
[9] => 9
[10] => 75
[11] => 238
[12] => 89
[13] => 238
I will be having more values in the actual JSON file. But by looking at this I can see that 238 and 55 is being repeated more than any other number. What I want to do is get the top 5 most repeated values in the array and store them in a new PHP array.
$values = array_count_values($array);
arsort($values);
$popular = array_slice(array_keys($values), 0, 5, true);
array_count_values() gets the count of the number of times each item appears in an array
arsort() sorts the array by number of occurrences in reverse order
array_keys() gets the actual value which is the array key in the results from array_count_values()
array_slice() gives us the first five elements of the results
Demo
$array = [1,2,3,4,238, 7, 86, 79, 55, 92, 55, 7, 254, 9, 75, 238, 89, 238];
$values = array_count_values($array);
arsort($values);
$popular = array_slice(array_keys($values), 0, 5, true);
array (
0 => 238,
1 => 55,
2 => 7,
3 => 4,
4 => 3,
)
The key is to use something like array_count_values() to tally up the number of occurrences of each value.
<?php
$array = [238, 7, 86, 79, 55, 92, 55, 7, 254, 9, 75, 238, 89, 238];
// Get array of (value => count) pairs, sorted by descending count
$counts = array_count_values($array);
arsort($counts);
// array(238 => 3, 55 => 2, 7 => 2, 75 => 1, 89 => 1, 9 => 1, ...)
// An array with the first (top) 5 counts
$top_with_count = array_slice($counts, 0, 5, true);
// array(238 => 3, 55 => 2, 7 => 2, 75 => 1, 89 => 1)
// An array with just the values
$top = array_keys($top_with_count);
// array(238, 55, 7, 75, 89)
?>
I have a problem with gradually calculating a value in PHP.
This is just an example. A user can level up, and when he reaches level 5 he unlocks the ability to play missions. The difficulty of a new generated mission is defined by a number: from 1 that is an easy mission to 10 that is a very difficult mission. See this table:
o 5: 1, 1, 2, 2, 3, 3, 3, 3, 3, 3 and so on
o 6: 1, 2, 2, 2, 3, 3, 3, 3, 3, 3
o 7: 2, 2, 2, 3, 3, 3, 3, 3, 3, 3
o 8: 2, 2, 3, 3, 4, 4, 4, 4, 4, 4
o 9: 2, 3, 3, 4, 4, 4, 4, 4, 4, 4
o 10: 3, 3, 4, 4, 5, 5, 5, 5, 5, 5
o 11: 3, 4, 4, 5, 6, 6, 6, 6, 6, 6
o 12: 4, 4, 5, 6, 7, 7, 7, 7, 7, 7
o 13: 4, 5, 6, 7, 8, 8, 8, 8, 8, 8
o 14: 5, 6, 7, 8, 9, 9, 9, 9, 9, 9
o 15: 6, 7, 8, 9, 10, 10, 10, 10, 10, 10
o 16: 7, 8, 9, 10, 10, 10, 10, 10, 10, 10
o 17: 8, 9, 10, 10, 10, 10, 10, 10, 10, 10
o 18: 9, 10, 10, 10, 10, 10, 10, 10, 10, 10
o 19: 10, 10, 10, 10, 10, 10, 10, 10, 10, 10
o 20: same as 19
This means: in level 5 the first mission is very easy (difficulty 1), the second one too, and the third mission is difficulty 2. And when the player is level 18: the first mission has a difficulty of 9 and the second and following missions have a difficulty of 10.
But: how to generate the difficulty of the missions?
I have two variables:
<?php
$current_player_level
$current_mission_in_level
?>
So:
<?php
$current_player_level=8;
$current_mission_in_level=3;
//This should return: 3
?>
So I need a function that returns the difficulty when the two variables above are provided.
I don't have any code because I don't know how to begin.
I'd suggest storing the difficulties in a 2-dimensional array (also called a "matrix" sometimes). The code would look like so:
$matrix_val = array(5 => array(1, 1, 2, 2, 3),
6 => array(1, 2, 2, 2, 3),
7 => array(2, 2, 2, 3, 3),
8 => array(2, 2, 3, 3, 4),
9 => array(2, 3, 3, 4, 4),
10 => array(3, 3, 4, 4, 5),
11 => array(3, 4, 4, 5, 6),
12 => array(4, 4, 5, 6, 7),
13 => array(4, 5, 6, 7, 8),
14 => array(5, 6, 7, 8, 9),
15 => array(6, 7, 8, 9, 10),
16 => array(7, 8, 9, 10, 10),
17 => array(8, 9, 10, 10, 10),
18 => array(9, 10, 10, 10, 10),
19 => array(10, 10, 10, 10, 10));
Then all you have to do is:
$difficulty = $matrix_val[$current_player_level][$current_mission_in_level];
NOTE: The "current mission in level" assumes 0 is the first index. So the third mission in level 13 would be referenced as $matrix_val[13][2] (notice [2]). If you want to shift this you can either add individual keys to each level, or simply "pad" a meaningless entry at the start of each inner array. (If this is confusing, let me know and I'll expand.)
For reference, check out the official Array PHP documentation, then you might want to read up on 2-dimensional arrays, too.
You should use arrays.
You can use 2D array (like a table) to store your levels and difficulties, and then get the right value according to the position you want.
For example:
$table = array(
5 => array(1, 1, 2, 2, 3),
6 => array(1, 2, 2, 3, 3),
7 => array(2, 2, 3, 3, 4)
);
I'm not showing the all array here.
So if you want to know for example the difficuly, you can use:
$current_difficulty = $table[$current_player_level][$current_mission_in_level];
The is no much math here, just knowing arrays.
// Filling 2D array with linear gradient from left top to right bottom
// There are some math for this. But i'm not sure it is needed
$MIN = 5.0; // min difficalty
$MAX = 9.0; // max difficalty
$M = 15.0; // Level legnth - 1
$N = 7.0; // Levels count -1
$res = array();
for($y = 0; $y <= $N; $y++)
for($x = 0; $x <= $M; $x++)
{
$y1 = ($N*$y-$M*$x+$M*$M)*$N/($M*$M+$N*$N);
$res[$N-$y][$x] = round($MAX - $y1/$N*($MAX-$MIN));
}
for($i=0; $i <= $N; $i++) {
$line = $res[$i];
echo implode(' ', $line)."\n";
}
Output:
5 5 5 6 6 6 6 7 7 7 7 7 8 8 8 8
5 5 6 6 6 6 6 7 7 7 7 8 8 8 8 8
5 5 6 6 6 6 7 7 7 7 7 8 8 8 8 8
5 6 6 6 6 6 7 7 7 7 7 8 8 8 8 9
5 6 6 6 6 7 7 7 7 7 8 8 8 8 8 9
6 6 6 6 6 7 7 7 7 7 8 8 8 8 9 9
6 6 6 6 6 7 7 7 7 8 8 8 8 8 9 9
6 6 6 6 7 7 7 7 7 8 8 8 8 9 9 9
I have an array like this
$baseArray = array( 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 );
So i want to make two arrays of range
$arrayOne = from index 5 - 10
$arrayTwo = from index 15 - 20
How can I split the $baseArray to make arrays like that in php ?
There is function array_slice
$baseArray = array( 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 );
$arrayOne = array_slice($baseArray, 5, 10);
$arrayTwo = array_slice($baseArray, 15, 20);
This should work for you:
(Only works if you have an index with numbers start's with 0)
$baseArray = array( 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 );
$arrayOne = array();
$arrayTwo = array();
foreach($baseArray as $k => $v) {
if($k >= 5 && $k <= 10)
$arrayOne[] = $v;
elseif($k >= 15 && $k <= 20)
$arrayTwo[] = $v;
}
print_r($arrayOne);
print_r($arrayTwo);
Output:
arrayOne:
Array
(
[0] => 6
[1] => 7
[2] => 8
[3] => 9
[4] => 10
[5] => 11
)
arrayTwo:
Array
(
[0] => 16
[1] => 17
[2] => 18
[3] => 19
[4] => 20
)
Can try using for() & array_slice(). Example:
$baseArray = array( 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 );
$newAr = array();
for($i = 5; $i < count($baseArray); $i += 10){
$newAr[] = array_slice($baseArray, $i, 5);
}
print '<pre>';
print_r($newAr);
print '</pre>';
For example suppose I have
$input = array(0, 1, 2, 3, 4, 5, 6, 7);
How would I remove element 5 and insert at position 2 leaving me with
0, 1, 5, 2, 3, 4, 6, 7
$input = array(0, 1, 2, 3, 4, 5, 6, 7);
array_splice($input, 2, 0, array($input[5])); //Place the a new array in the 3rd place of array
unset($input[6]); //remove the fifth element
array_splice($input, 0, 0); //to update the indexes
echo "<pre>".print_r($input,1)."</pre>"; //to view the array
Method without the need to unset and rearrange the index
$input = array(0, 1, 2, 3, 4, 5, 6, 7);
array_splice($input, 2, 0, array_splice($input,5,1));
Output
Array
(
[0] => 0
[1] => 1
[2] => 5
[3] => 2
[4] => 4
[5] => 5
[6] => 6
[7] => 7
)
$input = array(0, 1, 2, 3, 4, 5, 6, 7);
$moved = array_splice($input, 5, 1);
array_splice($input, 2, 0, $moved);
You should take a look at the function array_splice:
http://www.php.net/manual/en/function.array-splice.php
That will remove elements from an array and also insert.
array_splice(); will do it for you http://www.php.net/manual/fr/function.array-splice.php
EDIT :
array_splice(your_array,position_where_you_want_to_replace_your_number,1,replacement_number);
Never used it before, may I've made a mistake above, but it's a start, insn't it? :)
EDIT2 : above, you'll have to remove the second number which is still here with my function.
I have a set of numbers e.g.
$input = array(1, 4, 7, 4, 9, 4, 8, 6, 2, 8, 7, 7, 4, 5, 3);
I am trying to work out the importance of each number based on the following rule:
As the sequence gets longer the numbers get less significant, and each time a number is mentioned then it will improve the relevance (how much depends on its position in the
sequence).
I am expecting something like:
Array(
'4' => 90%
'1' => 75%
'7' => 60%
....
)
So 4 is the most inportant, followed by 1 and then 7 etc. Note that the output is completely fabricated but gives in indication that 4 should be the most important. I believe I want some kind of linear solution.
Is this more of what you were thinking? Answer based on stillstanding
$numbers = array(1, 4, 7, 4, 9, 4, 8, 6, 2, 8, 7, 7, 4, 5, 3);
$weight = array();
$count = count($numbers);
for ($i=0; $i<$count; $i++) {
if (!isset($weight[$numbers[$i]])) $weight[$numbers[$i]] = 1;
$weight[$numbers[$i]] += $count + pow($count - $i, 2);
}
$max = array_sum($weight);
foreach ($weight as &$w) {
$w = ($w / $max) * 100;
}
arsort($weight);
result:
Array
(
[4] => 34.5997286296
[7] => 17.3677069199
[1] => 16.3500678426
[8] => 10.0407055631
[9] => 9.29443690638
[6] => 5.42740841248
[2] => 4.40976933514
[5] => 1.35685210312
[3] => 1.15332428765
)
$numbers=array(1, 4, 7, 4, 9, 4, 8, 6, 2, 8, 7, 7, 4, 5, 3);
$weight=array();
$count=count($numbers);
for ($i=0; $i<$count; $i++) {
if (!isset($weight[$numbers[$i]]))
$weight[$numbers[$i]]=1;
$weight[$numbers[$i]]*=$count-$i;
}
var_dump($weight);
Result:
Array
(
[1] => 15
[4] => 5040
[7] => 260
[9] => 11
[8] => 54
[6] => 8
[2] => 7
[5] => 2
[3] => 1
)
This algorithm is fairly simplistic, but I think it accomplishes what you're looking for.
Given that you have the sequence you described above and it is stored in an array called $sequence
$a = array();
for($i=0;$i<count($sequence);$i++)
{
//calculate the relevance = 1/position in array
$relevance = 1/($i+1);
//add $relevance to the value of $a[$sequence[$i]]
if(array_key_exists((string)$sequence[$i],$a))
$a[(string)$sequence[$i]] += $relevance;
else
$a[(string)$sequence[$i]] = $relevance;
}
return $a;