如何检查foreach循环内的值是否相同

Question

i have a foreach loop as

foreach ($age as $ages) {
   echo $ages;
}

when run this code the result is

3
3

or

1
3

i want to check if values are same or not. For example

if (values are same) {
  do something...
}
else {
  do something...
}

i really couldn't find how to check values are same or not.

Answer 1

If you are checking to see if all values are identical just use array_unique() to remove duplicate values. Then check to see if the size of the remaining array is equal to 1:

$is_all_duplicates = count(array_unique($array)) === 1;

If any duplicates will trigger this condition, just use array_unique() to remove duplicate values and then compare the sizes of the two arrays. If they are not the same you had duplicate values:

$is_some_duplicates = count(array_unique($array)) < count($array);

Answer 2

If values are the same, then array_count_values will have one element only:

$a = [1,2,3,3];
$acv = array_count_values($a);
if (count($acv) == 1) {
    echo 'values are the same';
} else {
    echo 'values are NOT the same';
}


$a = [3,3,3];
$acv = array_count_values($a);
if (count($acv) == 1) {
    echo 'values are the same';
} else {
    echo 'values are NOT the same';
}

The fiddle .

But the most optimal solution is a simple loop with break on first value that is not equal to first of the array:

$a = [1,2,3,3];
$hasSameValues = true;

$firstElem = array_slice($a, 0, 1)[0];
foreach ($a as $el) {
    if ($el != $firstElem) {
        $hasSameValues = false;
        break;
    }
}

if ($hasSameValues) {
    echo 'values are the same';
} else {
    echo 'values are NOT the same';
}

echo PHP_EOL;

$a = [3,3,3];
$hasSameValues = true;

$firstElem = array_slice($a, 0, 1)[0];
foreach ($a as $el) {
    if ($el != $firstElem) {
        $hasSameValues = false;
        break;
    }
}

if ($hasSameValues) {
    echo 'values are the same';
} else {
    echo 'values are NOT the same';
}

Yet another fiddle .

Answer 3

You possible want to 'say':)

foreach ($ages as $age) {
   echo $age;
}

I understand that you want to check if only last value is equal with actual value.
To check that write this:

$ages = [1,1,7,2,2,4,1,2];

foreach ($ages as $age) {
    if(isset($temp) ? !($temp == $age)  : true){
       echo $age;
    }
    $temp = $age;
}

The result is: 172412
The code:
Check if variable $temp is set: isset($temp)
If it is set, check if it is NOT equal with last age value: !($temp == $age)
If the $temp isn't set, set true to run the code from if statement (echo the age)(is there for first run).