Arithmetic operators are the vast majority of knowledge we have learned in elementary school:
| Symbol | Explanation | Example |
|---|
| + | plus sign | #$x + $y |
| - | Minus sign | $x - $y |
##* | Multiply sign, multiply by | $x * $y |
/ | division sign, divided by | $x / $y |
% | Remainder is also called modulus and modulus | $x % $y |
<?php
$x = 5;
$y = 6;
//5+6为11
echo $x + $y;
?>
<?php
$x = 20;
$y = 15;
//20 -15 为5
echo $x - $y;
?>
<?php
$x = 20;
$y = 15;
//20乘以15结果为300
echo $x * $y;
?>
<?php
$x = 10;
$y = 5;
//10除以5 结果为2
echo $x / $y;
?>
<?php
$x = 10;
$y = 3;
//$x 不能整除3，得到的余数为1，所以结果输出为1
echo $x % $y;
?>
Similar to what we have learned in mathematics, there is also a priority: multiplication and division first, then addition and subtraction. If you want to change the priority more explicitly, use () [parentheses] to enclose the value you want to take precedence.
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