$num = 10.4567;
</span><span style="color: #008000;">//</span><span style="color: #008000;">第一种：利用round()对浮点数进行四舍五入</span>
<span style="color: #0000ff;">echo</span> <span style="color: #008080;">round</span>(<span style="color: #800080;">$num</span>,2); <span style="color: #008000;">//</span><span style="color: #008000;">10.46
 
//第二种：利用sprintf格式化字符串</span>
<span style="color: #800080;">$format_num</span> = <span style="color: #008080;">sprintf</span>("%.2f",<span style="color: #800080;">$num</span><span style="color: #000000;">);
</span><span style="color: #0000ff;">echo</span> <span style="color: #800080;">$format_num</span>; <span style="color: #008000;">//</span><span style="color: #008000;">10.46
 
//第三种：利用千位分组来格式化数字的函数number_format()</span>
<span style="color: #0000ff;">echo</span> <span style="color: #008080;">number_format</span>(<span style="color: #800080;">$num</span>, 2); <span style="color: #008000;">//</span><span style="color: #008000;">10.46
//或者如下</span>
<span style="color: #0000ff;">echo</span> <span style="color: #008080;">number_format</span>(<span style="color: #800080;">$num</span>, 2, '.', ''); <span style="color: #008000;">//</span><span style="color: #008000;">10/46</span></pre>