How to use PHP functions for data conversion and formatted output?

How to use PHP functions for data conversion and formatted output?

In PHP, functions are very important tools that can be used for data processing and formatted output. This article will introduce some commonly used PHP functions and how to use them for data conversion and formatted output.

1. Data conversion function

1. intval() function: used to convert strings to integers. If the string cannot be converted to an integer, 0 is returned. The sample code is as follows:

$str = "123";
$int = intval($str);
echo $int;  // 输出：123

$str2 = "abc";
$int2 = intval($str2);
echo $int2;  // 输出：0

2. floatval() function: used to convert strings to floating point numbers. If the string cannot be converted to a floating point number, 0 is returned. The sample code is as follows:

$str = "3.14";
$float = floatval($str);
echo $float;  // 输出：3.14

$str2 = "abc";
$float2 = floatval($str2);
echo $float2;  // 输出：0

3. strval() function: used to convert other data types to strings. The sample code is as follows:

$num = 123;
$str = strval($num);
echo $str;  // 输出：123

$bool = true;
$str2 = strval($bool);
echo $str2; // 输出：1

2. Formatted output function

1. number_format() function: used to format numbers, you can specify the number of decimal points and thousands separators and decimal separator. The sample code is as follows:

$num = 12345.6789;
$formatted = number_format($num, 2, ".", ",");
echo $formatted;  // 输出：12,345.68

2. sprintf() function: used to format strings and insert variables into strings according to the specified format. The sample code is as follows:

$name = "John";
$age = 30;
$message = sprintf("My name is %s and I am %d years old.", $name, $age);
echo $message;  // 输出：My name is John and I am 30 years old.

3. date() function: used to format date and time. Date and time can be converted into strings according to the specified format. The sample code is as follows:

$date = date("Y-m-d H:i:s");
echo $date;  // 输出：2022-01-01 12:00:00

3. Comprehensive application

The following is an example of a comprehensive application that demonstrates how to convert a string input by the user into an integer and format the output.

$input = $_POST['input'];  // 假设用户输入的字符串为 "1234"
$int = intval($input);  // 将字符串转换为整数
$formatted = number_format($int, 2, ".", ",");  // 格式化输出
echo $formatted;  // 输出：1,234.00

The above is an introduction to how to use PHP functions for data conversion and formatted output. Hopefully these examples will help you better understand and apply PHP functions.

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