Chapter 4 php mathematical operations

I. Numerical 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.
Copy codeThe Code is as follows:
<? Php
$ A = '5 ';
// The string of a number is also a number, which is used in mathematical operations as a number.
Echo is_numeric ($ a); // 1
Echo '<br/> ';
Echo 7 + $ a; // 12
Echo '<br/> ';
Echo '7' + $ a; // 12
Echo '<br/> ';
// Use. After the connection, it will be processed by string
Echo '7'. $ a; // 75
?>

Ii. Random Number
The Rand () function is a simple package for a random function defined in libc.
The Mt_rand () function is a good substitute for implementation.
Copy codeThe Code is as follows:
<? Php
$ A = rand (0, 10 );
Echo $;
Echo '<br/> ';
Echo getrandmax ();
Echo '<br/> ';
$ B = mt_rand (0, 10 );
Echo $ B;
Echo '<br/> ';
Echo mt_getrandmax ();
Echo '<br/> ';
?>

Output
1
32767
6
2147483647
3. format data
Copy codeThe Code is as follows:
<? Php
$ A = 12345.6789;
// Sets the number of decimal places to be retained.
Echo number_format ($ a, 2 );
Echo '<br/> ';
// You can also change the default decimal point and the decimal point.
Echo number_format ($ a, 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.

Copy codeThe Code is as follows:
<? Php
$ A =-123456.789;
$ B = array (1, 2, 3, 4 );
Echo abs ($ );
Echo '<br/> ';
Echo floor ($ );
Echo '<br> ';
Echo ceil ($ );
Echo '<br> ';
Echo round ($ );
Echo '<br> ';
Echo min ($ B );
Echo '<br> ';
Echo max ($ B );
?>

Output
123456.789
-123457
-123456
-123457
1
4