function.ceil.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Round fractions up</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.bindec.html">bindec</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.cos.html">cos</a></div> <div class="up"><a href="ref.math.html">Math Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.ceil" class="refentry"> <div class="refnamediv"> <h1 class="refname">ceil</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">ceil</span> — <span class="dc-title">Round fractions up</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">float</span> <span class="methodname"><b><b>ceil</b></b></span> ( <span class="methodparam"><span class="type">float</span> <tt class="parameter">$value</tt></span> )</div> <p class="simpara"> Returns the next highest integer value by rounding up <i><tt class="parameter">value</tt></i> if necessary. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">value</tt></i></span> <dd> <p class="para"> The value to round </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> <i><tt class="parameter">value</tt></i> rounded up to the next highest integer. The return value of <b>ceil()</b> is still of type <a href="language.types.float.html" class="type float">float</a> as the value range of <a href="language.types.float.html" class="type float">float</a> is usually bigger than that of <a href="language.types.integer.html" class="type integer">integer</a>. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>ceil()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">ceil</span><span style="color: #007700">(</span><span style="color: #0000BB">4.3</span><span style="color: #007700">); </span><span style="color: #FF8000">// 5<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">ceil</span><span style="color: #007700">(</span><span style="color: #0000BB">9.999</span><span style="color: #007700">); </span><span style="color: #FF8000">// 10<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">ceil</span><span style="color: #007700">(-</span><span style="color: #0000BB">3.14</span><span style="color: #007700">); </span><span style="color: #FF8000">// -3<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.floor.html" class="function" rel="rdfs-seeAlso">floor()</a></li> <li class="member"><a href="function.round.html" class="function" rel="rdfs-seeAlso">round()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.bindec.html">bindec</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.cos.html">cos</a></div> <div class="up"><a href="ref.math.html">Math Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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