运算符用于对变量和值执行操作。
PHP 将运算符分为以下几组:
PHP 算术运算符与数值一起使用来执行常见的算术运算,例如加法、减法、乘法等。
Operator | Name | Example | Result | Show it |
---|---|---|---|---|
+ | Addition | $x + $y | Sum of $x and $y | 尝试一下 » |
- | Subtraction | $x - $y | Difference of $x and $y | 尝试一下 » |
* | Multiplication | $x * $y | Product of $x and $y | 尝试一下 » |
/ | Division | $x / $y | Quotient of $x and $y | 尝试一下 » |
% | Modulus | $x % $y | Remainder of $x divided by $y | 尝试一下 » |
** | Exponentiation | $x ** $y | Result of raising $x to the $y'th power | 尝试一下 » |
PHP 赋值运算符与数值一起使用,将值写入变量。
PHP 中的基本赋值运算符是"="。这意味着左侧操作数被设置为右侧赋值表达式的值。
Assignment | Same as... | Description | Show it |
---|---|---|---|
x = y | x = y | The left operand gets set to the value of the expression on the right | 尝试一下 » |
x += y | x = x + y | Addition | 尝试一下 » |
x -= y | x = x - y | Subtraction | 尝试一下 » |
x *= y | x = x * y | Multiplication | 尝试一下 » |
x /= y | x = x / y | Division | 尝试一下 » |
x %= y | x = x % y | Modulus | 尝试一下 » |
PHP 比较运算符用于比较两个值(数字或字符串):
Operator | Name | Example | Result | Show it |
---|---|---|---|---|
== | Equal | $x == $y | Returns true if $x is equal to $y | 尝试一下 » |
=== | Identical | $x === $y | Returns true if $x is equal to $y, and they are of the same type | 尝试一下 » |
!= | Not equal | $x != $y | Returns true if $x is not equal to $y | 尝试一下 » |
<> | Not equal | $x <> $y | Returns true if $x is not equal to $y | 尝试一下 » |
!== | Not identical | $x !== $y | Returns true if $x is not equal to $y, or they are not of the same type | 尝试一下 » |
> | Greater than | $x > $y | Returns true if $x is greater than $y | 尝试一下 » |
< | Less than | $x < $y | Returns true if $x is less than $y | 尝试一下 » |
>= | Greater than or equal to | $x >= $y | Returns true if $x is greater than or equal to $y | 尝试一下 » |
<= | Less than or equal to | $x <= $y | Returns true if $x is less than or equal to $y | 尝试一下 » |
<=> | Spaceship | $x <=> $y | Returns an integer less than, equal to, or greater than zero, depending on if $x is less than, equal to, or greater than $y. Introduced in PHP 7. | 尝试一下 » |
PHP 增量运算符用于增加变量的值。
PHP 递减运算符用于递减变量的值。
Operator | Name | Description | Show it |
---|---|---|---|
++$x | Pre-increment | Increments $x by one, then returns $x | 尝试一下 » |
$x++ | Post-increment | Returns $x, then increments $x by one | 尝试一下 » |
--$x | Pre-decrement | Decrements $x by one, then returns $x | 尝试一下 » |
$x-- | Post-decrement | Returns $x, then decrements $x by one | 尝试一下 » |
PHP 逻辑运算符用于组合条件语句。
Operator | Name | Example | Result | Show it |
---|---|---|---|---|
and | And | $x and $y | True if both $x and $y are true | 尝试一下 » |
or | Or | $x or $y | True if either $x or $y is true | 尝试一下 » |
xor | Xor | $x xor $y | True if either $x or $y is true, but not both | 尝试一下 » |
&& | And | $x && $y | True if both $x and $y are true | 尝试一下 » |
|| | Or | $x || $y | True if either $x or $y is true | 尝试一下 » |
! | Not | !$x | True if $x is not true | 尝试一下 » |
PHP 有两个专门为字符串设计的运算符。
Operator | Name | Example | Result | Show it |
---|---|---|---|---|
. | Concatenation | $txt1 . $txt2 | Concatenation of $txt1 and $txt2 | 尝试一下 » |
.= | Concatenation assignment | $txt1 .= $txt2 | Appends $txt2 to $txt1 | 尝试一下 » |
PHP 数组运算符用于比较数组。
Operator | Name | Example | Result | Show it |
---|---|---|---|---|
+ | Union | $x + $y | Union of $x and $y | 尝试一下 » |
== | Equality | $x == $y | Returns true if $x and $y have the same key/value pairs | 尝试一下 » |
=== | Identity | $x === $y | Returns true if $x and $y have the same key/value pairs in the same order and of the same types | 尝试一下 » |
!= | Inequality | $x != $y | Returns true if $x is not equal to $y | 尝试一下 » |
<> | Inequality | $x <> $y | Returns true if $x is not equal to $y | 尝试一下 » |
!== | Non-identity | $x !== $y | Returns true if $x is not identical to $y | 尝试一下 » |
PHP 条件赋值运算符用于根据条件设置值:
Operator | Name | Example | Result | Show it |
---|---|---|---|---|
?: | Ternary | $x = expr1 ? expr2 : expr3 | Returns the value of $x. The value of $x is expr2 if expr1 = TRUE. The value of $x is expr3 if expr1 = FALSE |
尝试一下 » |
?? | Null coalescing | $x = expr1 ?? expr2 | Returns the value of $x. The value of $x is expr1 if expr1 exists, and is not NULL. If expr1 does not exist, or is NULL, the value of $x is expr2. Introduced in PHP 7 |
尝试一下 » |
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