Numbers

numbers are data values used to store numeric information such as whole numbers and decimal numbers. PHP automatically recognizes numbers and allows mathematical operations on them.

Integer
Float
Numeric Strings
Infinity
NaN

Example

// Integer (whole number)
$x = 25;
echo "Integer: " . $x;
echo "
";

// Float (decimal number)
$y = 10.5;
echo "Float: " . $y;
echo "
";

// Numeric String (number inside quotes)
$a = "100";
$b = "50";

// PHP automatically converts numeric strings into numbers during calculation
echo "Numeric String Addition: " . ($a + $b);
echo "
";

// Infinity example (division by zero gives infinite value)
$inf = 10 / 0;
echo "Infinity: " . $inf;
echo "
";

// NaN example (invalid mathematical operation)
$nan = sqrt(-1);
echo "NaN: " . $nan;
?>