📄 function.php-round.htm
字号:
<html>
<head>
<meta content="text/html; charset=gb2312" http-equiv=Content-Type>
<title>函数:round()</title>
<style type="text/css">
a {text-decoration: none;color:#6666ff;}
a:hover {color:#ff0000;}
</style>
</head>
<body bgcolor=ffffff leftmargin=0 topmargin=0 marginheight=0 marginwidth=0>
<p>
<div align=center><table border=0 width=70%><tr>
<td valign=middle width=20><hr size=1 width=100%></td>
<td valign=middle nowrap><font color=e06060 size=+2><b>函数:round()</b></font></td>
<td valign=middle width=100%><hr size=1 width=100%></td>
</tr></table></div><p>
<div align=center><table border=0 width=70%><tr><td>
<div align=right><a href="group.php-27.htm" alt="group.php?27">数学运算函数库</a></div><br><h1><font color=0000bb>round</font></h1><p>
四舍五入。<p>
<font color=ff8000>语法:</font> <b>double round(double val);</b><p>
<font color=ff8000>返回值:</font> 倍精确数<p>
<font color=ff8000>函数种类:</font> 数学运算<p>
<p><table border=0 cellspacing=0 cellpadding=0 width=100% height=1><tr><td height=1 bgcolor=c0c0c0><table border=0 cellspacing=0 cellpadding=0><tr><td></td></tr></table></td></tr>
<tr><td align=left><font color=ff8000>内容说明</font></td></tr></table><p>本函数用来将数字小数点后四舍五入。<p>
<p><table border=0 cellspacing=0 cellpadding=0 width=100% height=1><tr><td height=1 bgcolor=c0c0c0><table border=0 cellspacing=0 cellpadding=0><tr><td></td></tr></table></td></tr>
<tr><td align=left><font color=ff8000>使用范例</font></td></tr></table><p><font color="#000000">
<font color="#0000BB"><?php<br>$foo1 </font><font color="#007700">= </font><font color="#0000BB">round</font><font color="#007700">(</font><font color="#0000BB">3.4</font><font color="#007700">);<br></font><font color="#0000BB">$foo2 </font><font color="#007700">= </font><font color="#0000BB">round</font><font color="#007700">(</font><font color="#0000BB">3.5</font><font color="#007700">);<br></font><font color="#0000BB">$foo3 </font><font color="#007700">= </font><font color="#0000BB">round</font><font color="#007700">(</font><font color="#0000BB">3.6</font><font color="#007700">);<br>echo </font><font color="#DD0000">"round(3.4): "</font><font color="#007700">.</font><font color="#0000BB">$foo1</font><font color="#007700">.</font><font color="#DD0000">"<br>\n"</font><font color="#007700">;<br>echo </font><font color="#DD0000">"round(3.5): "</font><font color="#007700">.</font><font color="#0000BB">$foo2</font><font color="#007700">.</font><font color="#DD0000">"<br>\n"</font><font color="#007700">;<br>echo </font><font color="#DD0000">"round(3.6): "</font><font color="#007700">.</font><font color="#0000BB">$foo3</font><font color="#007700">;<br></font><font color="#0000BB">?></font>
</font>
<p>
<div align=center><img src="round.gif" alt="img/round.gif"></div>
<p><table border=0 cellspacing=0 cellpadding=0 width=100% height=1><tr><td height=1 bgcolor=c0c0c0><table border=0 cellspacing=0 cellpadding=0><tr><td></td></tr></table></td></tr>
<tr><td align=left><font color=ff8000>参考</font></td></tr></table><p><a href="function.php-Ceil.htm" alt="function.php?Ceil">Ceil()</a> <a href="function.php-Floor.htm" alt="function.php?Floor">Floor()</a> <p><hr size=1><br>如果你对此手册有任何问题,请到下面网址提问: <a href="www.web745.com">WEB开发知识库</a> (<a href="http://www.web745.com">www.web745.com</a>)<p>
</td></tr></table></div>
<p>
<div align=center>
<table border=0><tr><td>[ <a href="function.php-rand.htm" alt="function.php?rand">上一页</a> </td> <td> <a href="function.php-Sin.htm" alt="function.php?Sin">下一页</a> ]</td></tr></table>
</div><p><br><br>
</body>
</html>
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -