Basic syntax for PHP (ii)

Seven, PHP operators

1. Arithmetic operators

Arithmetic instructions

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

2. Assignment operators

Assignment is equivalent to a 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	$txt 1 = "Hello" $txt 2 = $txt 1. "World!"	Now $txt 2 contains "Hello world!"
.=	String Assignment	$txt 1 = "Hello" $txt 1. = "world!"	Now $txt 1 contains "Hello world!"

4, increment/decrement operator

Operator Name Description

+ + $x	Pre-increment	$x adds an increment, and then returns $x
$x + +	Post-increment	Return $x, then $x plus one increment
? $x	Before descending	$x decreases by one and then returns $x
$x?	After descending	Return $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 are not equal to $y and they are of different types.
>	Greater than	$x > $y	Returns True if the $x is greater than $y.
<	Greater than	$x < $y	Returns True if the $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 the $x and the $y are true.
Or	Or	$x or $y	Returns true if at least one of the $x and $y is 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 the $x and the $y are true.
|	Or	$x | $y	Returns true if at least one of the $x and $y is true.
!	Non -	! $x	Returns True if the $x is not true.

7. Array operators

Operator name Example Results

+	Joint	$x + $y	Union of $x and $y (but does not overwrite duplicate keys)
==	Equal	$x = = $y	Returns true if the $x and $y have the same key/value pair.
===	Congruent	$x = = = $y	Returns True if $x and $y have the same key/value pairs, and the same type is the same in the order.
!=	Not equal	$x! = $y	Returns true if $x is not equal to $y.
<>	Not equal	$x <> $y	Returns true if $x is not equal to $y.
!==	Not congruent	$x!== $y	Returns True if the $x is completely different from the $y.

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