PHP函数-数学函数

$a = -12;//12
$a = -112.02;//11.02
$a = "-123.2";//123.2
$a = -0b1100;//解析12
 $a = -01235;//解析 669
 //$a = -0x1f;//解析 31
 $a = "-10x2f";//先自动转换,再取绝对值 10
 var_dump(abs($a));

$a = 123.03;//124
$a = 12.00;//12
$a = 12.01;//13
$a = "112.3";//113
$a = "115.3fdsf";//116  先自动转换
var_dump(ceil($a));

var_dump(fmod(5,2));// 5/2=2..余1  float(1)
var_dump(fmod(11,3));//11/3=3..余2  float(2)

var_dump(pow(10,2));

var_dump(round(1.0234,3));//1.023
var_dump(round(1.000113,2));//1
var_dump(round(1.113,2));1.11

var_dump(sqrt(9));//3

max(432,56,7,8);
max(array(43,56,7,));

var_dump(mt_rand(10,100));

var_dump(rand(10,100));

pi();//3.14....