我如何检查数组的所有元素是否相同？

Question

ie, verify

$a[0]=1; $a[0]=1; $a[0]=1; $a[0]=1; $a[0]=1; $a[0]=1; $a[0]=1; $a[0]=1;

but not

$a[0]=1; $a[0]=2; $a[0]=1; $a[0]=1; $a[0]=1; $a[0]=1; $a[0]=1; $a[0]=1;

thanks :)

Answer 1

count(array_unique($a)) == 1;

Answer 2

Check if all items are equal to the first item:

$first = $array[0];
foreach ($array as $a) {
    if ($a != $first) {
        return false;
    }
}
return true;

Answer 3

If you are new to PHP, then it might be easier for you to use it in this way

function chkArrayUniqueElem($arr) {
    for($i = 0; $i < count($arr); $i++) {
        for($j = 0; $j < count($arr); $j++) {
            if($arr[$i] != $arr[$j]) return false;
        }
    }
    return true;
}

Other variants brought up earlier are more simple in use.