What are the PHP conversion functions?

PHP conversion functions include: 1. intval() function; 2. floatval() function; 3. strval() function; 4. boolval() function; 5. serialize() function and unserialize() function ;6. json_encode() function and json_decode() function.

The operating environment of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

PHP is a widely used server-side scripting language for developing web applications. During the development process, data often needs to be transformed to meet specific requirements. PHP provides many conversion functions for converting data between different formats. This article will introduce some commonly used PHP conversion functions.

1. intval() function: This function is used to convert variables into integer types. It returns the integer value of the variable, or 0 if it cannot be converted. For example:

$num = "123";
$result = intval($num);
echo $result; // 输出 123

2. floatval() function: This function is used to convert variables into floating point number types. It returns the floating point value of the variable, or 0 if it cannot be converted. For example:

$num = "3.14";
$result = floatval($num);
echo $result; // 输出 3.14

3. strval() function: This function is used to convert variables into string types. It returns the string representation of the variable, if the variable itself is a string, no conversion is performed. For example:

$num = 123;
$result = strval($num);
echo $result; // 输出 "123"

4. boolval() function: This function is used to convert variables into Boolean type. It returns the boolean value of the variable, or false if it cannot be converted. For example:

$num = 0;
$result = boolval($num);
echo $result; // 输出 false

5. serialize() function and unserialize() function: These two functions are used to serialize and deserialize data. Serialization is the process of converting data into strings, and deserialization is the process of converting strings into raw data. For example:

$data = array("name" => "John", "age" => 30);
$str = serialize($data);
echo $str; // 输出 "a:2:{s:4:"name";s:4:"John";s:3:"age";i:30;}"
$result = unserialize($str);
print_r($result); // 输出 Array ( [name] => John [age] => 30 )

6. json_encode() function and json_decode() function: These two functions are used to convert data into JSON format strings and restore JSON format strings to original data. JSON is a lightweight data exchange format that is widely used for data transmission in web applications. For example:

$data = array("name" => "John", "age" => 30);
$str = json_encode($data);
echo $str; // 输出 {"name":"John","age":30}
$result = json_decode($str, true);
print_r($result); // 输出 Array ( [name] => John [age] => 30 )

In addition to the above conversion functions, PHP also provides many other conversion functions, such as base64_encode() and base64_decode() for Base64 encoding and decoding of data, urlencode() and urldecode() Used to URL encode and decode strings, etc. These conversion functions help developers be more flexible and convenient when processing data, improving development efficiency.

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