Complete list of PHP conversion functions: commonly used functions and examples

PHP is a popular server-side scripting language that is widely used in web development. In PHP, conversion functions are very commonly used. These functions can convert data from one type to another, or format the data. This article will introduce some commonly used conversion functions and their sample codes in PHP, hoping to be helpful to beginners.

1. String conversion function

(1) intval(): Convert string to integer

$str = "123";
$int = intval($str);
echo $int; // 输出结果为123

(2) strval(): Convert integer to character String

$int = 123;
$str = strval($int);
echo $str; // 输出结果为"123"

2. Array conversion function

(1) implode(): Concatenate the array elements into a string

$array = array("apple", "banana", "orange");
$str = implode(", ", $array);
echo $str; // 输出结果为"apple, banana, orange"

(2) explode(): Concatenate the string Split into array elements

$str = "apple, banana, orange";
$array = explode(", ", $str);
print_r($array); // 输出结果为Array ( [0] => apple [1] => banana [2] => orange )

3. Type conversion function

(1) floatval(): Convert string to floating point number

$str = "3.14";
$float = floatval($str);
echo $float; // 输出结果为3.14

(2) intval(): Convert floating point numbers to integers

$float = 3.14;
$int = intval($float);
echo $int; // 输出结果为3

4. Time conversion function

(1) strtotime(): Convert date and time strings into timestamps

$date_str = "2022-01-01 12:00:00";
$timestamp = strtotime($date_str);
echo $timestamp; // 输出结果为1641043200

(2) date(): Format the timestamp into a date and time string

$timestamp = 1641043200;
$date_str = date("Y-m-d H:i:s", $timestamp);
echo $date_str; // 输出结果为"2022-01-01 12:00:00"

The above are some commonly used conversion functions and sample codes in PHP. By mastering the usage of these functions, you can process data more flexibly. In practice, play a greater role in development. Hope this article is helpful to PHP beginners.

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