Chapter 4 PHP Mathematical Operations_PHP Tutorial-PHP Tutorial-php.cn

Chapter 4 PHP Mathematical Operations_PHP Tutorial

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Release： 2016-07-21 15:21:47

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1. Numerical data types
There are generally two types of numerical or numerical data in PHP: double and int.
PHP is a loosely typed scripting language, so pay attention to the method of type conversion.

Copy code The code is as follows:

 
$a = '5'; 
/ / Strings of numbers are also numbers and participate in mathematical operations when number processing 
echo is_numeric ( $a ); //1 
echo '
'; 
echo 7 + $a; / /12 
echo '
'; 
echo '7' + $a; //12 
echo '
'; 
//Connect with . Then process it as a string 
echo '7' . $a; //75 
?> 

2. Random number
Rand() function is defined in libc A simple wrapper for a random function.
Mt_rand() function is a good alternative implementation.

Copy code The code is as follows:

 
$a = rand(0,10); 
echo $a; 
echo '
'; 
echo getrandmax(); 
echo '
'; 
$b = mt_rand(0, 10); 
echo $b; 
echo '
'; 
echo mt_getrandmax(); 
echo '
'; 
?> 

output
1
32767
6
2147483647
3. Format data

Copy codeThe code is as follows:

 
$a = 12345.6789; 
//Used to set how many decimal places to retain
echo number_format($a,2 ); 
echo '
'; 
//You can also change the default decimal point symbol and thousandths symbol 
echo number_format($a,2,'#', '*') 
?> 

Output
12,345.68
12*345#68
IV. Math functions

函数	功能
Abs()	取绝对值
Floor()	舍去法取整
Ceil()	进一法取整
Round()	四舍五入
Min()	求最小值或数组中最小值
Max()	求最大值或数组中最大值

Copy code The code is as follows:

 
$a = -123456.789; 
$b = array (1, 2, 3, 4); 
echo abs ( $a ); 
echo '
'; 
echo floor ( $a ); 
echo ' 
'; 
echo ceil ( $a ); 
echo '
'; 
echo round ( $a ); 
echo '
'; 
echo min ( $b ); 
echo '
'; 
echo max ( $b ); 
?> 