Introduction to commonly used numerical conversion functions in PHP

PHP is a scripting language widely used in website development. It provides many powerful numerical conversion functions that can help developers quickly implement data processing and conversion operations. In this article, we will introduce the commonly used numerical conversion functions in PHP and provide specific code examples.

1. intval() function
   intval() function is used to convert a variable to an integer. It can handle different types of inputs and convert them into integer values. If the input is a string type, the function will try to convert it to a number; if the input is a floating point number, the function will take the integer part; if the input is an array or object, the function will return 0.

Sample code:

$num1 = "123";
$num2 = 45.67;
$num3 = array(1, 2, 3);

echo intval($num1); // Output: 123
echo intval($num2); // Output: 45
echo intval($num3); // Output: 0

2. floatval() function
   floatval() function is used to convert a variable to a floating point number. It is similar to the intval() function and can convert string, integer and other types of data into floating point numbers.

Sample code:

$num1 = "123.45";
$num2 = 67;

echo floatval($num1); // Output: 123.45
echo floatval($num2); // Output: 67.0

3. number_format() function
   number_format() function is used to format a number with thousands separator and specified number of decimal places string. This is useful when displaying data such as amounts.

Sample code:

$number = 1234567.89;

echo number_format($number); // Output: 1,234,567.89

4. round() function
   round() function is used to round a number. You can specify the number of decimal places to retain. If not specified, the default is 0.

Sample code:

$num1 = 123.45;
$num2 = 67.89;

echo round($num1); // Output: 123
echo round($num2, 1); // Output: 67.9

5. abs() function
   abs() function is used to return the absolute value of a number.

Sample code:

$num = -123;

echo abs($num); // Output: 123

The above are commonly used numerical conversion functions in PHP. Through these functions, different types of data can be easily processed and converted. In actual development, choosing the appropriate function to perform numerical conversion according to specific needs can improve the efficiency and maintainability of the code.

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