Basic syntax for PHP (ii)

Seven, PHP operator 1, arithmetic operators

arithmetic	Description
+	Add
-	Reducing
*	By
/	Except
%	Take the mold

2. Assignment operators

Assign Value	equivalent to	Description
X =y	x = y	The right-hand expression sets the value for the left operand.
x + = y	x = x + y	Add
X-= y	x = XY	Reducing
X *= y	x = x * y	By
X/= y	× = x/y	Except
X%= y	x = x% y	Modulus

3. String operators

operator	name	Example	Results
.	Thread connection	$txt1 = "Hello" $txt2 = $txt1. "World!"	$txt2 now contains "Hello world!"
.=	String Assignment	$txt1 = "Hello" $txt1. = "world!"	$txt1 now contains "Hello world!"

4, increment/decrement operator

operator	name	Description
+ +$x	Pre-increment	$x plus one increment, and then return $x
$x + +	Post-increment	Returns $x, then $x plus one increment
–$x	Before descending	$x minus one decrement, and then return $x
$x –	After descending	Returns $x, then $x minus one decrement

5. Comparison operators

operator	name	Example	Results
==	Equals	$x = = $y	Returns True if $x equals $y.
===	Congruent (exact same)	$x = = $y	Returns True if $x equals $y and they are of the same type.
!=	Not equal to	$x! = $y	Returns True if $x is not equal to $y.
<>	Not equal to	$x <> $y	Returns True if $x is not equal to $y.
!==	Not congruent (completely different)	$x!== $y	Returns True if $x is not equal to $y and their type is not the same.
>	Greater than	$x > $y	Returns True if $x is greater than $y.
<	Greater than	$x < $y	Returns True if $x is less than $y.
>=	Greater than or equal to	$x >= $y	Returns True if $x is greater than or equal to $y.
<=	Less than or equal to	$x <= $y	Returns True if $x is less than or equal to $y.

6. Logical operators

operator	name	Example	Results
and	And	$x and $y	Returns True if both $x and $y are true.
Or	Or	$x or $y	Returns True if $x and $y have at least one true.
Xor	XOR or	$x xor $y	Returns True if $x and $y Have and only one is true.
&&	And	$x && $y	Returns True if both $x and $y are true.
|	Or	$x | $y	Returns True if $x and $y have at least one true.
!	Non -	! $X	Returns True if $x is not true.

7. Array operators returns True if $ x and $ y have the same key/value pair.

operator	name	example	result
+	Union	$ x + $ y	$ x and $< /span>y Union (but does not overwrite duplicate keys)
= =	equality	$ x = = $ y
= = =	congruent	$ x = = $ y	if $ X and $ y have the same key/value pairs, and return true if the same type is the same in order.
! =	Not equal	$ x! = $ y	if $ x Returns true, not equal to $ y.
<>	not Equal	$ x <> $ y	if $ x is not equal to $ y, returns True.
!==	not congruent	$ x!== $ y	if $x returns True if the $ y is different.

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Basic syntax for PHP (ii)