Summary of operators in php

<?php
/*  PHP的运算符号
 *    
 *    运算元   运算符   运算元
 *
 *     1         +      1 
 *  
 *    一元运算符  +1  -1  ++  --   ! 
 *
 *    二元运算符   +  - *  /  %   > < =  ==  ===  
 *
 *    三元运算符  1 ? 2 : 3
 *
 *   $a = 10;
 *
 *    算术运算符号  + - * / % ++ --
 *    赋值运算符号  = += -= *= /= %=
 *    比较运算符号  > < == >= <= === != !== 
 *    逻辑运算符号  && || ! 
 *    位运算符号    &  | ^  ~  >> << 
 *
 *    其它运算符号   ? :   @    => -> 
 *
 */
 ?>

•An operator is something that takes one or more given values ​​(an expression, in programming jargon) and produces another value (thus the entire structure becomes an expression). So think of functions or any structure that returns a value (like print) as operators, and those that don't return a value (like echo) as something else.

•There are three types of operators:

– Unary operators that operate on only one value, such as ! (the negation operator) or ++ (the addition operator).

– Binary operator, with two operands, most operators supported by PHP are of this type.

–Ternary operator: ? :.

It should be used to choose one expression between two other expressions, not to choose between two statements or program routes. It's a good idea to enclose the entire ternary expression in an expansion sign.

Operators in PHP

1. Arithmetic operators

## Common arithmetic operations Symbol

Operation typeOperatorExampleResultInversion operation--$aReturn the negative value of $aAddition operation+$a + $bReturns the sum of $a and $bSubtraction operation-$a - $bReturn $a and $ Difference of bMultiplication operation*$a * $b##Division operationRemainder operation

##Returns the product of $a and $b

/

$a / $b

Returns the quotient of $a and $b

%

##$a % $b

Return the remainder of $a and $b

2. Logical operators

Logical operators in PHP

##Operation typeOperatorExampleResultLogical and&& or and$a && $b or $a and $bWhen both $a and $b are true, return true, otherwise return falseLogical or|| or or$a || $b or $a or $bWhen $a or $b is When true, return true, otherwise return falseLogical XORxor$a xor $bWhen $a is true, $b is false or $a is false, $b is true, return true, otherwise return falselogical negation!

	##!$a	When $a is false, return true, otherwise return false

3. Assignment operator

The assignment operator "=" is the most basic operator in PHP, which assigns the value of the expression on the right side of "=" to the operand on the left.

In addition, the compound assignment operator is also commonly used in PHP.

                                                                     

Operator

Example##$a += 5Subtractive assignment-=$a -= 5Multiplication assignment*=$a *= 5Division assignment/=$a /= 5The remainder is assigned% =$a %= 5

Result

Addition assignment

+=

$a adds 5 and assigns the sum to $a

$a minus 5 is assigned to $a

The product of $a times 5 is assigned to $a

The quotient of $a divided by 5 is assigned to $a

# The remainder of $a divided by 5 is assigned to $a

4. Comparison operators

##is less than<$a < $bWhen the value of $a is less than that of $b value, returns true, otherwise returns false is greater than >$a > $bwhen $a If the value is greater than the value of $b, it returns true, otherwise it returns false is less than or equal to <=$a <= $ bWhen the value of $a is less than or equal to the value of $b, it returns true, otherwise it returns falsegreater than or equal to>=$a >= $bWhen the value of $a is greater than or equal to the value of $b, return true, otherwise return false##EqualCongruentNot equal Not equal

Operation type	Operator	Example	Result
==	$a == $b	When the value of $a is equal to the value of $b, it returns true, otherwise it returns false
===	$a === $b	When the value of $a is equal to the value of $b, and the value of $a and $b If the types are also equal, return true, otherwise return false
!=	$a != $b or $a < > $b	When the value of $a is equal to the value of $b, it returns false, otherwise it returns true
!==	$a !== $b	When the value of $a is equal to the value of $b, and the types of $a and $b are also equal, return false, otherwise return true

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