Check if all values in array are the same

Question

I need to check if all values in an array equal the same thing.

For example:

$allValues = array(
    \'true\',
    \'true\',
    \'true\',
);
         


        

Answer 1

$x = 0;
foreach ($allvalues as $a) {
   if ($a != $checkvalue) {
      $x = 1;
   }
}

//then check against $x
if ($x != 0) {
   //not all values are the same
}

Answer 2

If your array contains actual booleans (or ints) instead of strings, you could use array_sum:

$allvalues = array(TRUE, TRUE, TRUE);
if(array_sum($allvalues) == count($allvalues)) {
    echo 'all true';
} else {
    echo 'some false';
}

http://codepad.org/FIgomd9X

This works because TRUE will be evaluated as 1, and FALSE as 0.

Answer 3

Another option:

function same($arr) {
    return $arr === array_filter($arr, function ($element) use ($arr) {
        return ($element === $arr[0]);
    });
}

Usage:

same(array(true, true, true)); // => true

Answer 4

Why not just compare count after calling array_unique()?

To check if all elements in an array are the same, should be as simple as:

$allValuesAreTheSame = (count(array_unique($allvalues)) === 1);

This should work regardless of the type of values in the array.

Answer 5

Also, you can condense goat's answer in the event it's not a binary:

if (count(array_unique($allvalues)) === 1 && end($allvalues) === 'true') {
   // ...
}

to

if (array_unique($allvalues) === array('foobar')) { 
   // all values in array are "foobar"
}

Answer 6

You can compare min and max... not the fastest way ;p

$homogenous = ( min($array) === max($array) );