PHP learning: in-depth understanding of strings

The previous article introduced to you "How should we use multiple nesting of if statements in PHP process control? ? ? 》, this article continues to introduce you to strings in PHP:

In the previous articles, we also mentioned related issues such as strings in PHP , in the next few days we will continue to explain in depth some other issues about strings: First, we will divide it into three parts to learn about PHP strings from the beginning:

• Introduction to strings

• Use of string

• Use of string function library

1: PHP string Introduction

• String is one of the important data types in PHP and is one of the scalar types;

• A string is a series of characters, each character is a byte;

• The string needs to be defined in single quotes, double quotes, and delimiters

(single quotes) The code demonstration is as follows:

<?php
/*字符串定义在单引号中的使用
*/
echo &#39;人生十有八九不如意&#39;; 
//在单引号引起来的字符串中不能再包含引号
//否则会报错。
//在单引号中如果在包含单引号需要使用转义字符&#39;\&#39;转义
?>

The demonstration results are as follows:

(Double quotes) The code demonstration is as follows:

<?php
$poem = &#39;落花人独立,微雨燕双飞&#39;;
echo "$poem";//双引号可以解析变量，而单引号没有解析变量的作用
echo "<hr>";
echo "落花人独立,微雨燕双飞,{$poem}";
//可以用花括号{}括一个变量，就可以将变量分离出来解析，{}两边不要有空格
?>

The demonstration results are as follows:

Recommended learning: "PHP Video Tutorial 》

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