Nanny-level sharing of basic PHP operators

In the previous article, I brought you " Technical Answers: How to View and Judge PHP Data Types (Learning Sharing) ". Today I will continue to bring you an explanation of PHP knowledge and give you Let’s introduce the relevant knowledge of PHP operators in detail. Hope it helps everyone!

PHP Operator Operator refers to certain symbols that generate another value through one or more expressions. There are many kinds of operators. , such as: " ", " % ", " . ", etc. are all operators. So let’s take a look at the applications of different operators in PHP.

PHP Arithmetic Operator

“ "Addition operation, for example: $a $b;

" - "Subtraction operation, for example: $a-$b;

" * "Multiplication operation, for example: $a*$b;

" / "Division operation, for example ：$a/$b;

“ % ” takes the remainder operation (modulo operation), for example: $a%$b;

"; // 输出 7 echo ($x - $y)." "; // 输出 -1 echo ($x * $y)." "; // 输出 12 echo ($x / $y)." "; // 输出 0.75 echo ($x % $y)." "; // 输出 3 ?> Output result:

It can be concluded that using different arithmetic operators gives different results.

PHP assignment operator

We call = (equal sign) in the PHP operator As an assignment operator, it is used to assign values to variables, that is, assign the value on the right side of the equal sign to the variable on the left side of the equal sign, and the variable on the left side becomes the value on the right side.

" ＝ "Addition example: $x ＝ $y , that is: $x ＝ $x $y , add the variable on the left side of the operator to the right The value is assigned to the variable on the left.

" -＝ " Subtraction example: $x -＝ $y , that is: $x ＝ $x - $y , change the variable on the left side of the operator Subtract the value on the right and assign it to the variable on the left.

" *＝ "Multiplication example: $x *＝ $y , that is: $x ＝ $x * $y , change the variable on the left side of the operator Multiply the value on the right and assign it to the variable on the left.

" /＝ " Division example: $x /＝ $y , that is: $x ＝ $x / $y , change the variable on the left side of the operator Divide the value on the right and assign it to the variable on the left.

" %＝ " Example of remainder: $x %＝ $y , that is: $x ＝ $x % $y , change the left side of the operator The variable is evaluated modulo the value on the right and the result is assigned to the variable on the left.

" .＝ " splicing example: $x .＝ $y , that is: $x ＝ $x . $y , append the characters on the right to left.

';//$a += $b 的值为7 echo ($a -= $b).' ';//$a -= $b 的值为3 echo ($a *= $b).' ';//$a *= $b 的值为12 echo ($a /= $b).' ';//$a /= $b 的值为3 ?> Output result:

It can be seen that: $x ＝ $y is equivalent to $x ＝ $ x $y.

PHP string operator

There is only one string operator, which is the English period " . ", it is to connect two strings and splice them into a new string.

Output result:

##PHP increment/decrement operator

In our daily use, arithmetic operators are suitable for use when there are two or more different operands, but when there is only one operand, you can use increment " " or decrement " -- " operator.

First increase or decrease the variable by 1 and then assign the value to the original variable, which is called the prefix increment or decrement operator (prefix auto-increment and self-decrement operator);

Put the operator after the variable, that is, first return the current value of the variable, and then increase or decrease the value of the variable by 1, which is called a post-increment or decrement operator ( Post-increment and decrement operators).

';//输出结果为4 echo $b++.' ';//输出结果为4 echo --$c.' ';//输出结果为4 echo $d--.' ';//输出结果为6 ?> Output result:

##PHP comparison operator

PHP comparison operators are used to compare two values (numbers or strings)

== are used to Comparison is equal to, for example: $x == $y , if $x is equal to $y, return true.

=== 用于比较全等（完全相同），例：$x === $y ， 如果 $x 等于 $y，且它们类型相同，则返回 true

!= 用于比较不等于 ，例： $x != $y ， 如果 $x 不等于 $y，则返回 true。

用于比较不等于，例： $x $y ， 如果 $x 不等于 $y，则返回 true。

!== 用于比较不全等（完全不同），例：$x !== $y ， 如果 $x 不等于 $y，且它们类型不相同，则返回 true。

> 用于比较大于，例：$x > $y ， 如果 $x 大于 $y，则返回 true。

用于比较小于，例： $x

>= 用于比较大于或等于 ，例： $x >= $y ， 如果 $x 大于或者等于 $y，则返回 true.

用于比较小于或等于 ，例： $x

"; var_dump($x === $y); echo " "; var_dump($x != $y); echo " "; var_dump($x !== $y); echo " "; $a=50; $b=100; var_dump($a > $b); echo " "; var_dump($a 输出结果：

PHP逻辑运算符

&& 与逻辑运算符，例：$x && $y ， 如果 $x 和 $y 都为 true，则返回 true。

|| 或逻辑运算符，例：$x || $y， 如果 $x 和 $y 至少有一个为 true，则返回 true。

! 非逻辑运算符，例：!$x ， 如果 $x 不为 true，则返回 true。

输出结果：

输出天天向上，所以刚才输出了假区间。

输出结果：

输出福如东海，逻辑或，有一个为真则为真，所以输出了真区间。

输出结果：

输出好好学习，逻辑非，把flase变成了true，输出了真。

推荐学习：《 PHP视频教程 》

Nanny-level sharing of basic PHP operators

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