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HomeBackend DevelopmentPHP TutorialPHP的根本语法(二)

PHP的基本语法(二)

七、PHP运算符

1、算数运算符

算数 说明
+
-
*
/
% 取模

2、赋值运算符

赋值 等同于 描述
x =y x = y 右侧表达式为左侧运算数设置值。
x += y x = x + y
x -= y x = x - y
x *= y x = x * y
x /= y x = x / y
x %= y x = x % y 模数

3、字符串运算符

运算符 名称 例子 结果
. 串接 $txt1 = “Hello” $txt2 = $txt1 . ” world!” 现在 $txt2 包含 “Hello world!”
.= 串接赋值 $txt1 = “Hello” $txt1 .= ” world!” 现在 $txt1 包含 “Hello world!”

4、递增/递减运算符

运算符 名称 描述
++$x 前递增 $x 加一递增,然后返回 $x
$x++ 后递增 返回 $x,然后 $x 加一递增
$x 前递减 $x 减一递减,然后返回 $x
$x– 后递减 返回 $x,然后 $x 减一递减

5、比较运算符

运算符 名称 例子 结果
== 等于 $x == $y 如果$x 等于 $y,则返回 true。
=== 全等(完全相同) $x === $y 如果 $x 等于 $y,且它们类型相同,则返回 true。
!= 不等于 $x != $y 如果 $x 不等于 $y,则返回 true。
不等于 $x $y 如果 $x 不等于 $y,则返回 true。
!== 不全等(完全不同) $x !== $y 如果 $x 不等于 $y,且它们类型不相同,则返回 true。
> 大于 $x > $y 如果 $x 大于 $y,则返回 true。
大于 $x $y 如果 $x 小于 $y,则返回 true。
>= 大于或等于 $x >= $y 如果 $x 大于或者等于 $y,则返回 true.
小于或等于 $x $y 如果 $x 小于或者等于 $y,则返回 true。

6、逻辑运算符

运算符 名称 例子 结果
and $x and $y 如果 $x 和 $y 都为 true,则返回 true。
or $x or $y 如果$x 和$y 至少有一个为 true,则返回 true。
xor 异或 $x xor $y 如果 $x 和 $y 有且仅有一个为 true,则返回 true。
&& $x && $y 如果 $x 和 $y 都为 true,则返回 true。
| $x | $y 如果 $x 和 $y 至少有一个为 true,则返回 true。
! !$x 如果 $x 不为 true,则返回 true。

7、数组运算符

运算符 名称 例子 结果
+ 联合 $x + $y $x 和 $y 的联合(但不覆盖重复的键)
== 相等 $x == $y 如果 $x 和 $y 拥有相同的键/值对,则返回 true。
=== 全等 $x === $y 如果 $x 和 $y 拥有相同的键/值对,且顺序相同类型相同,则返回 true。
!= 不相等 $x != $y 如果 $x 不等于 $y,则返回 true。
不相等 $x $y 如果 $x 不等于 $y,则返回 true。
!== 不全等 $x !== $y 如果 $x 与 $y 完全不同,则返回 true。

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