[PHP] 8. 연산자 (Operators) - PHP 강좌, PHP5

PHP 5 Operators

 

1. PHP Operators

 연산자(Operator)는 변수와 값을 연산을 수행하기 위해 사용됩니다.

2. PHP Arithmetic Operators

 PHP 산술(Arithmetic) 연산자는 숫자 값을 일반적인 산술 연산을 하기 위해 사용됩니다.

Operator	Name	Example	Result	Show it
+	Addition	$x + $y	Sum of $x and $y	Show it ≫
-	Subtraction	$x - $y	Difference of $x and $y	Show it ≫
*	Multiplication	$x * $y	Product of $x and $y	Show it ≫
/	Division	$x / $y	Quotient of $x and $y	Show it ≫
%	Modulus	$x % $y	Remainder of $x divided by $y	Show it ≫
**	Exponentiation	$x ** $y	Result of raising $x to the $y'th power (Introduced in PHP 5.6)

 [ 출처: W3Schools ]

3. PHP Assignment Operators

 PHP 할당 연산자는 숫자 값을 변수의 값으로 쓰기 위해 사용됩니다.

Assignment	Same as...	Description	Show it
x = y	x = y	The left operand gets set to the value of the expression on the right	Show it ≫
x += y	x = x + y	Addition	Show it ≫
x -= y	x = x - y	Subtraction	Show it ≫
x *= y	x = x * y	Multiplication	Show it ≫
x /= y	x = x / y	Division	Show it ≫
x %= y	x = x % y	Modulus	Show it ≫

  [ 출처: W3Schools ]

4. PHP Comparison Operators

 PHP 비교 연산자는 두 값을 비교하기 위해 사용됩니다(숫자 혹은 문자)

Operator	Name	Example	Result	Show it
==	Equal	$x == $y	Returns true if $x is equal to $y	Show it ≫
===	Identical	$x === $y	Returns true if $x is equal to $y, and they are of the same type	Show it ≫
!=	Not equal	$x != $y	Returns true if $x is not equal to $y	Show it ≫
<>	Not equal	$x <> $y	Returns true if $x is not equal to $y	Show it ≫
!==	Not identical	$x !== $y	Returns true if $x is not equal to $y, or they are not of the same type	Show it ≫
>	Greater than	$x > $y	Returns true if $x is greater than $y	Show it ≫
<	Less than	$x < $y	Returns true if $x is less than $y	Show it ≫
>=	Greater than or equal to	$x >= $y	Returns true if $x is greater than or equal to $y	Show it ≫
<=	Less than or equal to	$x <= $y	Returns true if $x is less than or equal to $y	Show it ≫

 

  [ 출처: W3Schools ]

5. PHP Increment / Decrement Operators

 PHP 증가 연ㅅ

Operator	Name	Description	Show it
++$x	Pre-increment	Increments $x by one, then returns $x	Show it ≫
$x++	Post-increment	Returns $x, then increments $x by one	Show it ≫
--$x	Pre-decrement	Decrements $x by one, then returns $x	Show it ≫
$x--	Post-decrement	Returns $x, then decrements $x by one	Show it ≫

  [ 출처: W3Schools ]

6. PHP Logical Operators

Operator	Name	Example	Result	Show it
and	And	$x and $y	True if both $x and $y are true	Show it ≫
or	Or	$x or $y	True if either $x or $y is true	Show it ≫
xor	Xor	$x xor $y	True if either $x or $y is true, but not both	Show it ≫
&&	And	$x && $y	True if both $x and $y are true	Show it ≫
||	Or	$x || $y	True if either $x or $y is true	Show it ≫
!	Not	!$x	True if $x is not true	Show it ≫

  [ 출처: W3Schools ]

7. PHP String Operators

Operator	Name	Example	Result	Show it
.	Concatenation	$txt1 . $txt2	Concatenation of $txt1 and $txt2	Show it ≫
.=	Concatenation assignment	$txt1 .= $txt2	Appends $txt2 to $txt1	Show it ≫

  [ 출처: W3Schools ]

8. PHP Array Operators

Operator	Name	Example	Result	Show it
+	Union	$x + $y	Union of $x and $y	Show it ≫
==	Equality	$x == $y	Returns true if $x and $y have the same key/value pairs	Show it ≫
===	Identity	$x === $y	Returns true if $x and $y have the same key/value pairs in the same order and of the same types	Show it ≫
!=	Inequality	$x != $y	Returns true if $x is not equal to $y	Show it ≫
<>	Inequality	$x <> $y	Returns true if $x is not equal to $y	Show it ≫
!==	Non-identity	$x !== $y	Returns true if $x is not identical to $y	Show it ≫

  [ 출처: W3Schools ]