试图检查PHP中的整数

Question

The function below is trying to find whole numbers. But somehow I'm not doing this right as it shows every number to be whole (no digits after .)

$max_value % 1 should only return true is there is no rest value??

Can anyone help me, now every check gives 0 as result.

Hope I explain well what I mean

solution(30);

function solution($a){

 $sides_short = array();
 $sides_long  = array();
 $max_number  = $a/2;
 $total = $a;

 for($i=1;$i<=$max_number;$i++){
    $min_value = $i;
    $max_value = $a / $min_value;
    echo "loop values: ".$min_value." x ".$max_value."<br>";

    if($max_value % 1 == 0) {
        echo ($max_value % 1) ."<br>";
        echo "Aproved: (".$min_value." x ".$max_value.") $max_value % 1 = ".($max_value % 1)."<br><br>";
        $sides_short[] = $min_value; 
        $sides_long[] = $max_value;
    }
}

}

Answer 1

You're using a modulo. That divides by that number and returns the remainder.

$x = 3 % 2; // $x = 1

3 goes into 2 once, and leaves a remainder of 1

Anything divided by 1 is that number, with a remainder of 0. Therefore, this statement is always true.

if($max_value % 1 == 0)

Also, if you modulus a floating number, it will also be 0

var_dump(8 % 1.5); // int(0)

If you really need to modulus a float, use fmod

var_dump(fmod(8, 1.5)); // float(0.5)