Example explanation of PHP operators

1. Arithmetic operators:
%: Modulo operation (remainder operation)
/: Division operation (the result is the value of the quotient)
Note: The divisors of the above two operations cannot be 0. In PHP language, the operands on both sides of % will be converted to integers before the operation.
Example:

    <?php    $a=10%3;    echo "<p>$a</p>";//输出数值1
    var_dump($a);//可以输出数据的类型：int（1）?>

##2. String operator in PHP There is only one string operator in English, which is the English period (.), also known as the connection operator
If you are connecting a variable, you need to add (.) on both sides of the variable and add "" on the outside
Example:

<?php     header("Content-type:text/html;charset=utf-8");     $name="吴彦祖";     $age=30;     $adress="中华民族共和国";     echo "<p>我的名字：".$name.",</p><p>我来自".$adress."。</p>"."<br>今年$age.岁";    ?>

3. Assignment operator: Operate the value on the left and your value on the right and assign it to the left                         .=                                                                                                                                                                                                    

## 4. Comparison operators: Denta computers


# This, "==", "===" the differences " =”: It is an assignment symbol “==”: It is an equal sign. When the operand on the left is equal to the operand on the right, TRUE is returned, otherwise it returns FALSE “===”: When the operand on the left The operands are the same as the operands on the right, and their data types are also the same before TRUE







5. Logical operators: used to determine right or wrong
and or &&: TRUE is returned only when the operands on both sides are TRUE or or ||: operands on both sides When it is FASE, it returns FALSE not or!: When the operand is TRUE, it returns FALSE xor: Logical AND or operation, as long as one side of the operand is TRUE, it can return TRUE




6. Bit operators:


&: Two 1s are 1; |: Two 0s are 0; ^ : When the two operands are different, it is 1 Example:

<?php     
header("Content-type:text/html;charset=utf-8");     
$name="吴彦祖";     
$age=30;     
$adress="中华民族共和国";     
echo "<p>我的名字：".$name.",</p><p>我来自".$adress."。</p>"."<br>今年$age.岁";    ?>

    
    7.三元运算符：（exprl）？（exprl1）：（exprl2）类似与  “if...else”，但是三元运算符会显得更加的整洁
      当experl的值为TRUE时，获取exprl1 的值，反之 取exprl2的值
      
      
    8.执行运算符  ：反引号‘ ’
PHP将尝试将引号的内容作为操作系统命令来执行，并将其输出信息返回


9.错误输出控制符号：@
将其放在一个PHP表达式之前，产生的任何警告信息都将被忽略，它只对表达式有效。

规则：如果能从某处取到值，就可以在它的前面加上@。不能放在函数和类的定义之前。

10.运算符的优先级

优 先 级      结合方向  运 算 符  附加信息
1  非结合  new  new
2  左  [  array()
3  非结合  ++ --  递增／递减运算符
4  非结合  ! ~ - （int） （float） （string） （array） （object） @  类型
5  左  * / %  算数运算符
6  左  + - .  算数运算符和字符串运算符
7  左  << >>  位运算符
8  非结合  < <= > >=  比较运算符
9  非结合  == != === !==  比较运算符
10  左  &  位运算符和引用
11  左  ^  位运算符
12  左  |  位运算符
13  左  &&  逻辑运算符
14  左  ||  逻辑运算符
15  左  ? :  三元运算符
16  右  = += -= *= /= .= %= &= |= ^= <<= >>=  赋值运算符
17  左  and  逻辑运算符
18  左  xor  逻辑运算符
19  左  or  逻辑运算符
20  左  ,  多处用到

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