Summary of usage of '{}' braces in PHP

This article mainly introduces a summary of the usage of "{}" braces in PHP. It has certain reference value. Now I share it with you. Friends in need can refer to it.

In PHP, Braces "{}" can play the following roles:

1. Combine multiple independent statements into a compound statement, such as if...else...which is often used

2. Delimit the variable indirect reference to avoid ambiguity. For example, the difference between ${$my_var[8]} and ${$my_var}[8]

3. Used to indicate a single character in a string variable (the subscript starts from 0), such as

　

 $my_str="1234"; 
　　   $my_str{1}='5'; //现在 $my_str 内容为 '1534'

　 This usage is a feature after PHP 5, used to eliminate ambiguities caused by the use of square brackets.

4. Define the name of the variable

  $var='sky'; 
       echo "{$var}boy";

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