PHP basic symbols

Annotation symbol
:

// Single line Annotation

/**/Multi-line Annotation

Use of quotation marks


''Single quotes, no meaning, can be taken without any processing;

"" Double quotes, PHP dynamic processing and output, usually used for variables.

Variable form:

True is true;

The other is false.

Common variables:


String string (numbers, Chinese characters, etc)

INTEGER (1, 2, 3, 4, 5, 0,-1,-2, and so on)

Double Floating Point Number (decimal point)

Array

Object

Common symbols

/"Double quotation marks

// Backslash

/N line feed

/R output

/T hop (Tab)

Operator number

+ Addition operation-subtraction operation

* Multiplication/Division

% Get remainder + + accumulate

-- Accumulate 1. Add strings

Set operation

= Place the value on the right to the left (yes)

+ = Add the right value to the left

-= Reduce the value on the right to the left

* = Multiply the value on the left by the value on the right.

/= Divide the value on the left by the value on the right

. = Add the string on the right to the left

Bitwise Operator

&

| Or

^ Exclusive (XOR)

<Shift left

> Shift to the right

~ 1 Population

Logical operation

<Less> greater

<= Less than or equal to> = greater than or equal

! = Not equal to & and

| Or! No

Other operators

$ Variable symbol

& Variable indicators (before a variable)

@ Do not display the error message (before the function)

-> Object methods or attributes

=> Array element value

? : Ternary Operator