What do {} braces mean in php_php basics

1. {} represents the beginning and end of the program block

For example

Copy code The code is as follows:

if ($x==$y)
{
do_nothing();
}

2. {} is used to represent string subscripts

For example
(quoting the words of the longnetpro brothers)
$s{1} represents the second byte (not the first) of the string $s, which is basically the same as $s[1], except The latter is the old way of writing, the PHP manual recommends the first way of writing www.444p.com All Rights Reserved

3. Separate variables

For example

Copy code The code is as follows:

$s = "Di, ";
echo ("${s}omething");
//Output: Di, something

And if you use echo ("$something");
then it will output $ something is the variable.