keep only repeated items in an array

[gdfhghjdfghgfhf]

i have an array with a lot of items.... i'm looking for a function to keep only the items repeated at least 3 times

 

example

 

array(

"one item",

"two items",

"two items",

"three items",

"three items",

"three items",

"end"

);

 

 

would become

 

 

array(

"three items",

"three items",

"three items"

);

 

 

 

thanks !!

[harristweed]

<?php
$array=array(
"one item",
"two items",
"two items",
"three items",
"three items",
"three items",
"end"
);
$newarray=(array_count_values($array));
foreach ($newarray as $key => $value) {
if($value<3)unset($newarray[$key]);
}
print_r ($newarray);
$flip=array_flip($newarray);
print_r ($flip);
?>

[harristweed]

Wont work, I'll think about MKII

[Adam]

Thought this was going to be easy when I first looked at it, but decided to find a solution for my own curiosity more than anything.

 

It's ugly, but:

 

$array = array(
    'value 1', 'value 1', 'value 1',
    'value 2', 'value 2', 'value 2',
    'value 3', 'value 3',
    'value 4', 'value 5',
);

$counts = array_count_values($array);

foreach ($counts as $count_key => $count)
{
    if ($count < 3)
    {
        foreach ($array as $key => $value)
        {
            if ($value == $count_key)
            {
                unset($array[$key]);
            }
        }
    }
}

 

I wonder if anyone has a better way?

[harristweed]

best I can do:

<?php
$array=array(
"one item",
"two items",
"two items",
"three items",
"three items",
"three items",
"end"
);
$newarray=(array_count_values($array));
foreach ($newarray as $key => $value) {
if($value<3)unset($newarray[$key]);
}
print_r ($newarray);

// just reread your post
$try_again=array();
foreach ($newarray as $key => $value) {
    for($i=0;$i<$value;$i++){
        $try_again[]=$key;
    }
}
    print_r ($try_again);
?>

[gwolgamott]

Coule also use array_count_values(), will make your values the keys and the value will be the number of occurrences.

 

<?php
$a=array("Cat","Dog","Horse","Dog");
$b = array();
$b = array_count_values($a);
?>

The value of array $b will be:

Array ( [Cat] => 1 [Dog] => 2 [Horse] => 1 )

 

Then just repopulate your array from that information with a foreach statement

 

$c = array();
$count = 0;
foreach ($b as $key => $value)
{
        if($value == 3) 
       {
         $c[$count] = $key;
         $count++;
         $c[$count] = $key;
         $count++;
         $c[$count] = $key;
         $count++;
       }
}

 

Bit ugly but could be cleaned up some.

[Adam]

Coule also use array_count_values(), will make your values the keys and the value will be the number of occurrences.

 

<?php
$a=array("Cat","Dog","Horse","Dog");
$b = array_count_values($a);
?>

The value of array $b will be:

Array ( [Cat] => 1 [Dog] => 2 [Horse] => 1 )

 

Then just repopulate your array from that information with a foreach statement

 

$c = array();
$count = 0;
foreach ($b as $key => $value)
{
        if($value == 3) 
       {
         $c[$count] = $key;
         $count++;
         $c[$count] = $key;
         $count++;
         $c[$count] = $key;
         $count++;
       }
}

 

Bit ugly but could be cleaned up some.

 

*At least* 3..

[gwolgamott]

if($value == 3)

that should be greater then or equal to 3... thanks for point that out

and will have to do minor changes... oh that changes things let me get back on that.

[gwolgamott]

Replace that with my original for each statement

foreach ($b as $key => $value)
{
        if($value >= 3) 
       {
         for ($i=value; $i>0; $i--)
           {
              $c[$count] = $key;
              $count++;
           }

         $count++;
       }
}

[ignace]

Thought this was going to be easy when I first looked at it, but decided to find a solution for my own curiosity more than anything.

 

It's ugly, but:

 

$array = array(
    'value 1', 'value 1', 'value 1',
    'value 2', 'value 2', 'value 2',
    'value 3', 'value 3',
    'value 4', 'value 5',
);

$counts = array_count_values($array);

foreach ($counts as $count_key => $count)
{
    if ($count < 3)
    {
        foreach ($array as $key => $value)
        {
            if ($value == $count_key)
            {
                unset($array[$key]);
            }
        }
    }
}

 

I wonder if anyone has a better way?

 

How about? It's that simple or am I missing something?

 

$valueCount = array_count_values($array);
foreach ($array as $key => $value) {
  if ($valueCount[$value] < 3 || $valueCount[$value] > 3) {
    unset($array[$key]);
  }
}

 

Edit: I tested it using the array of MrAdam and got

 

Array

(

    [ 0 ] => value 1

    [ 1 ] => value 1

    [ 2 ] => value 1

    [ 3 ] => value 2

    [ 4 ] => value 2

    [ 5 ] => value 2

)

[kenrbnsn]

That's a good solution, except the OP wants to keep all entries repeated 3 or more times, so remove the " || $valueCount[$value] > 3" from the "if" statement.

 

I tested your solution with the array:

Array
(
    [0] => one item
    [1] => two items
    [2] => two items
    [3] => three items
    [4] => three items
    [5] => three items
    [6] => four
    [7] => four
    [8] => four
    [9] => four
    [10] => five
    [11] => end
    [12] => five
    [13] => five
    [14] => five
    [15] => five
)

and got

Array
(
    [3] => three items
    [4] => three items
    [5] => three items
    [6] => four
    [7] => four
    [8] => four
    [9] => four
    [10] => five
    [12] => five
    [13] => five
    [14] => five
    [15] => five
)

 

Ken

[Adam]

Oh yeah, was overcomplicating things..