100%
if( true )
1/2
if( rand(0,1) === 0 )
1/3
if( rand(0,2) === 0 )
1/4
if( rand(0,3) === 0 )
1/x
if( rand(0,x) === 0 )
x%
if( rand(0,99) < x )
x‰
if( rand(0,999) < x )
x‱
if( rand(0,9999) < x )
1 | /** |
2 | * 以$x/$y的概率返回true |
3 | * |
4 | * @param int $x |
5 | * @param int $y |
6 | * @return bool |
7 | * |
8 | * prob(1,2) = 1/2 |
9 | * prob(1,100) = 1/100 |
10 | * |
11 | */ |
12 | function prob($x, $y){ |
13 | return ( mt_rand(0, $y-1) < $x ); |
14 | } |