Detailed explanation of php string usage

I think everyone is familiar with PHP strings. This article mainly shares with you the detailed usage of PHP strings. I hope you can better understand PHP strings.

The following is an example:

<?php$name = &#39;张三&#39;; 
echo &#39;我叫$name&#39;,&#39;<br>&#39;; // 单引号，不错处理，直接输出 效率高echo "我叫&name",&#39;<br>&#39;; // 双引号，会处理$开头的变量  echo &#39;我叫&#39;.$name,&#39;<br>&#39;;// 可以在单引号外面单独输出变量echo "$name是我的名字",&#39;<br>&#39;;// 报错，双引号会吧 $以后的字符全部作为变量名echo "{$name}是我的名字",&#39;<br>&#39;;// 为了处理上面的问题，需要加 {}echo "${name}是我的名字",&#39;<br>&#39;;// {}和$顺序无所谓，都能正确运行。echo &#39;我说："你好"&#39;,&#39;<br>&#39;; //这样没问题echo "我说：\"你好\"",&#39;<br>&#39;;// 这样就需要 转义符&#39;\&#39;?>

The results are as follows:

我叫$name我叫&name我叫张三

Notice: Undefined variable: name是我的名字 in F:\Service\wamp\apache24\htdocs\str.php on line 6张三是我的名字
张三是我的名字
我说："你好"我说："你好"

Output a large string:
String delimiter:

// heredoc 定界符 变量会被解析echo <<<str  
    i am $name
    you are beautfull
    <br>
str;
//加上 &#39;&#39; 称为 nowdoc 内容中间的变量不会被替换。echo <<<&#39;str&#39;
    i am $name
    you are beautfull
str;

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