What is the method for converting a PHP array into a string?

There are several ways to convert a PHP array into a string:

1. The implode() function merges the values of an array into a single string and returns the result.

$array = array('Hello', 'World');
$str = implode(' ', $array);
// 输出：Hello World

1. The function json_encode() converts an array into a JSON string.

$array = array('Hello', 'World');
$str = json_encode($array);
// 输出：["Hello","World"]

1. The serialize() function converts an array into a string.

$array = array('Hello', 'World');
$str = serialize($array);
// 输出：a:2:{i:0;s:5:"Hello";i:1;s:5:"World";}

It is necessary to select the appropriate method for conversion based on specific needs.