PHP nested foreach to get unique size of array

Question

Here is the situation: There are thousand of data. But not all of that are unique. The first foreach loop is unique. So, I am putting the size in a Array . Next loop might have same size. So, I am checking the size of a variable. If the size found in the Array , that means its not unique otherwise the size of that variable would be in the Array. The problem is I'm getting common and unique (both) size in the Array.

PHP Code:

$counter = array();
foreach ($result_all as $data){
    $message =  $data['msg'];
    $size_of_message = strlen($message);

    if(contains($message,$chittagong)){
       if(empty($counter)){
           $counter[] = $size_of_message;
       }else{
           foreach($counter as $a) {
               if ($size_of_message !== $a)
                   $counter[] = $size_of_message;
           }
       }
    }
}

Result:

Array
(
    [0] => 153
    [1] => 122
    [2] => 165
    [3] => 165
)

The result I am expecting:

Array
(
    [0] => 153
    [1] => 122
    [2] => 165
)

To know if a value is already in your array, use this method : http://php.net/manual/fr/function.in-array.php No need to manually loop through like you tried to do — Dimitri Bosteels, Oct 24 '18 at 12:47

score 0 · Answer 1 · answered Oct 24 '18 at 12:46

0

You can easily use the native function array_unique

$array = [0=>153, 1=>122, 2=>165, 3=>165];
$array_unique = array_unique($array);
print_r($array_unique);

answered Oct 24 '18 at 12:46

executable

3,365
6
24
52

I found the solution! I didn't know about Array Unique, It seems this function works too. Thank you. – Shamem Ahmad Oct 24 '18 at 13:02

score 0 · Answer 2 · answered Oct 24 '18 at 12:48

Try

$counter = array();
foreach ($result_all as $data){
    $message =  $data['msg'];
    $size_of_message = strlen($message);
    if(contains($message,$chittagong)){
       if(empty($counter)){
           $counter[] = $size_of_message;
       }
       if(!empty($counter)){
           foreach($counter as $a) {
               if ($size_of_message !== $a)
                   $counter[] = $size_of_message;
           }
       }
    }
}

or use Array Unique after foreach

I found the solution! I didnt know about Array Unique, seems this function works too. Thanks btw. — Shamem Ahmad, Oct 24 '18 at 13:01

score 0 · Answer 3 · answered Oct 24 '18 at 12:48

0

Maybe using array keys unicity is an idea :

$result = array();
foreach ($result_all as $data){
    $result[strlen($data['msg'])] = true;
}
$result = array_keys($result);

answered Oct 24 '18 at 12:48

Séverin

137
1
6

score 0 · Accepted Answer · answered Oct 24 '18 at 12:54

The problem lies here:

           foreach($counter as $a) {
               if ($size_of_message !== $a)
                   $counter[] = $size_of_message;
           }

You are comparing $size_of_message with every existing element, and for most of them if statement will return true, adding new element to counter. And you want to add it only if no element matches it. So you need to use in_array() function instead of foreach:

if (!in_array($size_of_message, $counter) {
  $counter[] = $size_of_message;
}

In this case you also don't need to check if array is empty.

Amazing! Your solution just worked! Thanks a lot! – Shamem Ahmad Oct 24 '18 at 13:00 — Shamem Ahmad, Oct 24 '18 at 13:00

PHP nested foreach to get unique size of array

4 Answers4