Chapter 4 mathematical operations

I.Numeric data type

Numeric or numeric data are generally two types of double and INT in PHP.

PHP is a loose scripting language. Pay attention to the type conversion method.

<? PHP $='5'; //The string of a number is also a number. It is used in mathematical operations as a number. EchoIs_numeric ($);// 1 Echo'<Br/>'; Echo7+$;// 12 Echo'<Br/>'; Echo'7'+$;// 12 Echo'<Br/>'; //Use.After connection, it will be processed by string Echo'7'.$;// 75 ?>

 

II.Random Number

Rand ()A function is a simple package of a random function defined in libc.

Mt_rand ()Function is a good alternative to implementation.

<? PHP $= Rand (0,10); Echo$; Echo'<Br/>'; EchoGetrandmax (); Echo'<Br/>';   $ B= Mt_rand (0,10); Echo$ B; Echo'<Br/>'; EchoMt_getrandmax (); Echo'<Br/>'; ?>

Output

1 32767 6 2147483647

 

3..Format data

<? PHP $=12345.6789; //Used to set the number of decimal points retained EchoNumber_format ($,2); Echo'<Br/>'; //You can also change the default decimal point and kilobytes. EchoNumber_format ($,2,'#','*') ?>

Output

12,345.68 12*345 #68

 

Iv. mathematical functions

Function	Function
ABS ()	Take absolute value
Floor ()	Rounding
Ceil ()	Returns an integer.
Round ()	Rounding
Min ()	Minimum value or the minimum value in the array
Max ()	Returns the maximum value or the maximum value in the array.

 

<? PHP $=-123456.789; $ B=Array(1,2,3,4); EchoABS ($); Echo'<Br/>'; EchoFloor ($); Echo'<Br>'; EchoCeil ($); Echo'<Br>'; EchoRound ($); Echo'<Br>'; EchoMin ($ B); Echo'<Br>'; EchoMax ($ B); ?>

Output

123456.789 -123457 -123456 -123457 1 4