What is the link character and how to use it in php

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In php, a link refers to the symbol of a linked string, which is used to concatenate characters and can concatenate two or more strings into a new string. There are two kinds of PHP linkers: 1. The connector is just a simple concatenation string; 2, the ". =" operator, which can be spliced and assigned, can append the string (variable) on the right to the left.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In php, a link refers to the symbol of a linked string, which is used to concatenate characters and can concatenate two or more strings into a new string.

For example, put the following two strings:

$str1= "hello"; $str2= "world"

Concatenate into a string:

Helloworld

There are two types of PHP linkers:

"." Connector

". =" operator

1. Connector

Is a simple concatenation string, syntax:

String1.string2.string3. .stringN

The operation in the above example can be as follows:

$str1= "hello"; $str2= "world"; $str=$str1.$str2;echo $str

You can also add a delimiter between two strings

Echo $str1. ". $str2;echo $str1." -. $str2

2. ". =" operator

". =" is an assignment operator that appends the string (variable) to the right of the operator to the left to form a new value and then assign it to the left. Syntax:

$string = string1;$string. = string2;$string. = string3; $string. = stringN

The operator ". =" is more convenient to concatenate two strings, but it is not good to concatenate more than one string at a time. Fu.

Example:

$str1= "hello"; $str2= "world"; $str1.=$str2;echo $str1

When you concatenate two strings with the ". =" operator, you cannot add a delimiter in the middle.

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