[英]How can I check if a number is a multiple of the input - PHP
What I am trying to build is a function that takes an input number and checks if the following number is a multiple of that number. 我正在尝试构建的函数需要一个输入数字,并检查以下数字是否为该数字的倍数。
function checkIfMult($input,$toBeChecked){
// some logic
}
example: 例:
checkIfMult(2,4) // true
checkIfMult(2,6) // true
checkIfMult(2,7) // false
checkIfMult(3,6) // true
checkIfMult(3,9) // true
checkIfMult(3,10) // false
My first instinct was to use arrays 我的本能是使用数组
$tableOf2 = [2,4,6,8,10,12,14,16,18]
But then a call like this would be highly unpractical: 但是,这样的呼叫将非常不切实际:
checkIfMult(6,34234215)
How can I check to see if something is a multiple of the input? 如何检查输入是否是输入的倍数?
The Modulo operator divides the numbers and returns the remainder. 模运算符将数字相除并返回余数。
In math, a multiple means that the remainder equals 0. 在数学上,倍数表示余数等于0。
function checkIfMult($input,$toBeChecked){
return $toBeChecked % $input === 0;
}
function checkIfMult($input, $toBeChecked){ console.log('checkIfMult(' + $input +',' + $toBeChecked + ')', $toBeChecked % $input === 0); return $toBeChecked % $input === 0; } checkIfMult(2,4) // true checkIfMult(2,6) // true checkIfMult(2,7) // false checkIfMult(3,6) // true checkIfMult(3,9) // true checkIfMult(3,10) // false
You can use the modulus operator, if the result is 0 then the function should return true. 您可以使用模运算符,如果结果为0,则该函数应返回true。 The modulus operator ( % ) performs a division and returns the remainder.
模运算符( % )执行除法并返回余数。
http://php.net/manual/en/language.operators.arithmetic.php http://php.net/manual/zh/language.operators.arithmetic.php
Alternatively, You can also divide the $tobechecked by $input and check if there is a remainder by using the floor function. 或者,您也可以将$ tobechecked的$除以$ input并使用floor函数检查是否有余数。
if(is_int($result))
{ echo "It is a multiple";
}
else
{ echo "It isn't a multiple"; }
You can modulo %
Like: 您可以对
%
求模,例如:
In computing, the
modulo
operation finds the remainder after division of one number by another (sometimes called modulus).在计算中,
modulo
运算将一个数除以另一个后的余数(有时称为模数)。
function checkIfMult($input,$toBeChecked){
return !( $toBeChecked % $input );
}
This follow the result 这遵循结果
echo "<br />" . checkIfMult(2,4); // true
echo "<br />" . checkIfMult(2,6); // true
echo "<br />" . checkIfMult(2,7); // false
echo "<br />" . checkIfMult(3,6); // true
echo "<br />" . checkIfMult(3,9); // true
echo "<br />" . checkIfMult(3,10); // false
You can use % operator 您可以使用%运算符
function check($a,$b){
if($b % $a > 0){
return 0;
}
else{
return 1;
}
}
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