Modulus php math function to get reminder of a division of numbers

Get an integer remainder with %

The modulus operator % returns the integer remainder after division. It is useful for even/odd checks and repeating patterns.

$number = 17;
if ($number % 2 === 0) {
    echo 'Even';
} else {
    echo 'Odd';
}

The % operator works on integers. For floating-point remainders use fmod().

The modulus operator % returns the remainder after integer division. Both operands are converted to integers before the operation.

A zero divisor throws DivisionByZeroError. For floating-point remainders, use fmod().

fmod(): floating-point remainder
We can see the modulus of 160 and 15 is equal to 10. The remainder is 0 if two numbers are 150 and 10.

$num1 = 160;
$num2 = 15;
echo "<p>The values are $num1 and $num2</p>";
$result = $num1 % $num2;
echo "<P>The modulus of these numbers  is $result</P>";

Output

The value of variables is 160 & 15

The modulus of these numbers is 10

Finding odd or even number

All even numbers will have remainder of zero when divided by 2.
Here is the code

$number=97;
if($number%2==0){
echo " $number is a even number ";
}else{
echo " $number is an odd number ";
}

Sum of digits of a number

<?php
$t1=1234321; // Sample number  
$sum=0; 
while($t1>0){
	$d=$t1%10; // remainder of division 
	$sum = $sum  + $d;
	$t1=intdiv($t1, 10); // remove the last digit
}
echo $sum;
?>

Reverse the number

<?php
$t1=1234; // Sample data 
$t1_reverse=0; 
while($t1>0){
	$d=$t1%10; // remainder of division 
	$t1_reverse = $t1_reverse * 10 + $d;
	$t1=intdiv($t1, 10); // remove the last digit
}
echo $t1_reverse;
?>

Output

Making alternate rows in different colors

While writing output of a series of records from database table or from any other sources we can make alternate rows of different colors by using modulus function.

Here two style class are defined. Based on modulus value one of them is assigned to as class property of the row of the table.

Here is the code

<html>
<head>
<title>(Type a title for your page here)</title>
<style>
table.t1 tr.r1 td { background-color: #f1f1f1; } 
table.t1 tr.r0 td { background-color: yellow; } 
</style>
</head>

<body>
<?php
$i=1;
echo "<table class='t1'>";

for($i=1; $i<=10; $i++){
$m=$i%2;
echo "<tr class='r$m'><td>This is row No : $i</td></tr>";
}

echo "</table>";

?>
</body>
</html>

The output is here.

<table class='t1'><tr class='r1'><td>This is row No : 1</td></tr><tr class='r0'><td>This is row No : 2</td></tr><tr class='r1'><td>This is row No : 3</td></tr><tr class='r0'><td>This is row No : 4</td></tr><tr class='r1'><td>This is row No : 5</td></tr><tr class='r0'><td>This is row No : 6</td></tr><tr class='r1'><td>This is row No : 7</td></tr><tr class='r0'><td>This is row No : 8</td></tr><tr class='r1'><td>This is row No : 9</td></tr><tr class='r0'><td>This is row No : 10</td></tr></table>

Math Functions Absolute value of a number Rounding off value pow() to get exponential value

Subhendu Mohapatra

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Modulus of two variables in PHP