What are the functions and uses of PHP curly braces? (Picture + video tutorial)

In the process of learning PHP, everyone should know that different types of brackets have different functions. So some friends may not know exactly what it does. This article will introduce and summarize the PHP curly braces, which is also the role of braces and how to use them.

Below we will explain it one by one through specific code examples.

1. { } is treated as a variable

Code example 1:

<?php
$name = "张三";
$age = 14;
echo "我是$name，我今年$age岁";

The output result of this code is as follows:

An error message appears in the picture. Then we change the above code to the following:

<?php
$name = "张三";
$age = 14;
echo "我是{$name}，我今年{$age}岁";

At this time, the output is displayed as normal:

The function of the curly brackets here is to tell PHP, Characters inside curly brackets should be treated as variables.

2. There is { } after the string variable, which is treated as an array

Code example 2:

<?php
$str = "abcd";
echo $str{1};
echo "<hr>";
$str{0} = &#39;z&#39;;
echo $str;

This paragraph The code output result is as follows:

As shown in the figure, when we echo output $str{1}, it is equivalent to processing $str as an array, so the output is represented here. The value with subscript 1 is b; similarly we can replace a certain character in the variable. As above, we change the value with subscript 0 to 'z', and the result will be displayed as zbcd.

Of course we can also perform a delete operation:

<?php
$str = "abcd";
$str{0} = &#39;&#39;;
echo $str;

The result is:

3. Specify the scope
In PHP functions or flow control statements, these are common: if(){}, foreach(){}, etc. Mainly to keep the data executable within the scope.

This article is about the function of PHP curly braces and an introduction to several usages. If you want to learn more about PHP knowledge points, you can follow the PHP Chinese website PHP Video Tutorial. Everyone is welcome to refer to and learn!

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