Type conversion of arrays in php

PHP is a very flexible programming language and very powerful in data processing. In PHP, arrays are one of the commonly used data types, and multiple types of arrays are also supported. During project implementation, we often need to perform some type conversion operations on arrays. This article will introduce the type conversion operation of arrays in PHP.

1. Convert array to string

In PHP, use the implode() function to convert an array into a string. The syntax format of the implode() function is as follows:

string implode ( string $glue , array $pieces )

Among them, $glue is an optional parameter, representing a string connecting array elements, and the default is "". $pieces is a required parameter and represents the array to be connected.

The following is a simple example to convert an array into a string:

$arr = array('Hello', 'world', '!');
$str = implode(' ', $arr);
echo $str; // Hello world !

2. Convert a string into an array

In PHP, use explode () function converts a string into an array. The syntax format of the explode() function is as follows:

array explode ( string $delimiter , string $string [, int $limit = PHP_INT_MAX ] )

Among them, $delimiter is a required parameter, which represents the symbol for splitting the string. $string is a required parameter, indicating the string to be split. $limit is an optional parameter, indicating the maximum number of splits, and splits all by default.

The following is a simple example to convert a string into an array:

$str = "Hello world!";
$arr = explode(' ', $str);
print_r($arr); // Array([0] => Hello [1] => world!)

3. Convert array into object

In PHP, use forced typing Conversion converts an array into an object. For example:

$arr = array('name' => 'Tom', 'age'=> 18);
$obj = (object) $arr;
echo $obj->name; // Tom
echo $obj->age; // 18

4. Convert object to array

In PHP, use cast to convert object to array. For example:

$obj = new stdClass();
$obj->name = 'Tom';
$obj->age = 18;
$arr = (array) $obj;
print_r($arr); // Array([name] => Tom [age] => 18)

5. JSON conversion

JSON is a commonly used data exchange format, and PHP also provides support for the JSON format. In PHP, you can use the json_encode() function to convert an array or object into a JSON-formatted string.

$arr = array('name' => 'Tom', 'age'=> 18);
$json = json_encode($arr);
echo $json; // {"name":"Tom","age":18}

$obj = new stdClass();
$obj->name = 'Tom';
$obj->age = 18;
$json = json_encode($obj);
echo $json; // {"name":"Tom","age":18}

Use the json_decode() function to convert a JSON-formatted string into an array or object.

$json = '{"name":"Tom","age":18}';
$arr = json_decode($json, true);
print_r($arr); // Array([name] => Tom [age] => 18)

$obj = json_decode($json);
echo $obj->name; // Tom
echo $obj->age; // 18

Summary

This article introduces the type conversion of arrays in PHP. In project development, data type conversion is a common operation, and conversion between different data types can greatly simplify code implementation in our projects. Hope this article is helpful to you.

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