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In this paper, the mathematical operations and data processing methods of PHP are described. Share to everyone for your reference, as follows:

A Numeric data type

In PHP, the use of numeric or numeric data and mathematical functions is simple. Basically, there are two types of data to work with: floating-point numbers and integers. The internal representations of floating-point and integer values are the C data type double and int respectively. These data types, similar to those in c,php, follow the same set of rules.

PHP is a loosely typed scripting language, and variables can change the data type based on the requirements of the calculation. This allows the engine to perform type conversions dynamically. Therefore, if the calculation contains numeric values and strings, the string is converted to a numeric value before the calculation is completed, and the value is converted to a string before the string is concatenated.

<?php$a = ' 5 '; $b = 7 + $a; echo "7 + $a = $b";? >

PHP provides a number of functions to check the data type of a variable. There are 3 functions to check if a variable contains a numeric value, or more specifically, to check whether the variable is a floating-point number or an integer.
The function is_numeric () checks to see if the value passed in as a parameter is numeric.

The functions Is_int () and is_float () are used to check the specific data type. If an integer or floating-point number is passed in, the functions return true, otherwise false is returned, even if the string passed in with a valid numeric representation returns FALSE.

You can also force the engine to change the data type. This is called a type cast, which can be implemented either by adding (int), (integer), (float), (double), or (real) before a variable or value, or by using the function intval () or floatval ().

Two Random number

The random number itself is a science. There have been many different implementations of random number generators. PHP implements two of these: rand () and Mt_rand (). The rand () function is a simple wrapper for a random function defined in libc (one of the basic libraries provided by the compiler that is used to build PHP). Mt_rand () is a good alternative implementation that provides a lot of well-designed features, and Mt_rand () is even faster than the version in libc.

Two functions provide some functions to get the value of Max_rand. Rand () is Getrandmax (), Mt_rand () is Mt_getrandmax ();

Three Formatting data

In addition to warnings, errors and other information, most of PHP's output is generated using functions such as ECHO, print (), and printf (). These functions convert the parameters into a string and send them to the client application.
The Number_format () function converts integers and floating-point values to a readable string representation.

<?php $i = 123456; $si = Number_format ($i, 2, ".", ","); Echo $si;? >

Four Mathematical functions

ABS () absolute value
Floor () de-rounding method
Ceil () into a method to take the whole
Round () rounding
Min () to find minimum or minimum value in array
Max () max value in array

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