php 取整方法总结
php 取整方法总结:
(1)往大的取整:ceil() —— 取得不小于参数的下一个整数,若有小数部分则进一位,返回的类型是 float
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2
//往大了取
3
$c_1 = ceil(3.4);
4
echo $c_1.'
';
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6
$c_2 = ceil(3.5);
7
echo $c_2.'
';
8
?>
结果:
(2)往小的取整:floor() —— 取得不大于参数的下一个整数,若有小数部分则舍去,返回的类型是 float
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2
//往小了取
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$f_1 = floor(3.4);
4
echo $f_1.'
';
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6
$f_2 = floor(3.5);
7
echo $f_2.'
';
8
?>
结果:
(3)四舍五入法:round() —— 对浮点数进行四舍五入,函数有两个参数,第二个参数可设置结果保留的小数位位数
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02
//四舍五入法
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$r_1 = round(3.4);
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$r_2 = round(3.5);
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echo $r_1.'
';
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echo $r_2.'
';
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$r_3 = round(3.444, 2);
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$r_4 = round(3.445, 2);
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echo $r_3.'
';
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echo $r_4.'
';
12
?>
结果:
(4)强制转换法:intval() —— 变量转成整数类型,函数有两个参数,第一个参数可以为数组或类之外的任何类型变量,第二个参数设置第一个参数的进制,然后将该进制的数转换成10进制整数
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02
//强制转换
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$i_1 = intval(3.4);
04
echo $i_1.'
';
05
06www.2cto.com
$i_2 = intval(3.5);
07
echo $i_2.'
';
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$i_3 = intval(a, 16);
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echo $i_3.'
';
11
?>
作者:frylan

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