Home php教程 php手册 第四章 php数学运算

第四章 php数学运算

Jun 13, 2016 pm 12:03 PM
double int php one generally and exist numerical value number math data Chapter Four type Operation

一.数值数据类型
数字或数值数据在PHP中一般就两种double和int。
PHP是一种松散类型的脚本语言,要注意类型转换的方式。

复制代码 代码如下:


$a = '5';
//数字的字符串也是数字,参与数学运算当数字处理
echo is_numeric ( $a ); //1
echo '
';
echo 7 + $a; //12
echo '
';
echo '7' + $a; //12
echo '
';
//用.连接后就按字符串处理
echo '7' . $a; //75
?>


二.随机数
Rand()函数是libc中定义的一个随机函数的简单包装器。
Mt_rand()函数是一个很好的代替实现。

复制代码 代码如下:


$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
三.格式化数据

复制代码 代码如下:


$a = 12345.6789;
//用于设置保留多少位小数点
echo number_format($a,2);
echo '
';
//也可以改变默认小数点的符号表示和千分位的表示符号
echo number_format($a,2,'#','*')
?>


Output
12,345.68
12*345#68
四.数学函数

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

复制代码 代码如下:


$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 );
?>


output
123456.789
-123457
-123456
-123457
1
4
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