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<div id="intlchar.digit" class="refentry">
<div class="refnamediv">
<h1 class="refname">IntlChar::digit</h1>
<p class="verinfo">(PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">IntlChar::digit</span> — <span class="dc-title">Get the decimal digit value of a code point for a given radix</span></p>
</div>
<div class="refsect1 description" id="refsect1-intlchar.digit-description">
<h3 class="title">说明</h3>
<div class="methodsynopsis dc-description">
<span class="modifier">public</span> <span class="modifier">static</span> <span class="methodname"><strong>IntlChar::digit</strong></span>(<span class="methodparam"><span class="type"><span class="type"><a href="language.types.integer.php" class="type int">int</a></span>|<span class="type"><a href="language.types.string.php" class="type string">string</a></span></span> <code class="parameter">$codepoint</code></span>, <span class="methodparam"><span class="type"><a href="language.types.integer.php" class="type int">int</a></span> <code class="parameter">$base</code><span class="initializer"> = 10</span></span>): <span class="type"><span class="type"><a href="language.types.integer.php" class="type int">int</a></span>|<span class="type"><a href="language.types.singleton.php" class="type false">false</a></span>|<span class="type"><a href="language.types.null.php" class="type null">null</a></span></span></div>
<p class="para rdfs-comment">
Returns the decimal digit value of the code point in the specified radix.
</p>
<p class="para">
If the radix is not in the range <code class="literal">2<=radix<=36</code> or if the value of <code class="parameter">codepoint</code>
is not a valid digit in the specified radix, <strong><code><a href="reserved.constants.php#constant.false">false</a></code></strong> is returned.
A character is a valid digit if at least one of the following is true:
<ul class="simplelist">
<li>The character has a decimal digit value. Such characters have the general category "Nd" (decimal digit numbers) and a Numeric_Type of Decimal. In this case the value is the character's decimal digit value.</li>
<li>The character is one of the uppercase Latin letters 'A' through 'Z'. In this case the value is c-'A'+10.</li>
<li>The character is one of the lowercase Latin letters 'a' through 'z'. In this case the value is ch-'a'+10.</li>
<li>Latin letters from both the ASCII range (0061..007A, 0041..005A) as well as from the Fullwidth ASCII range (FF41..FF5A, FF21..FF3A) are recognized.</li>
</ul>
</p>
</div>
<div class="refsect1 parameters" id="refsect1-intlchar.digit-parameters">
<h3 class="title">参数</h3>
<dl>
<dt><code class="parameter">codepoint</code></dt>
<dd>
<p class="para">The <span class="type"><a href="language.types.integer.php" class="type int">int</a></span> codepoint value (e.g. <code class="literal">0x2603</code> for <em>U+2603 SNOWMAN</em>), or the character encoded as a UTF-8 <span class="type"><a href="language.types.string.php" class="type string">string</a></span> (e.g. <code class="literal">"\u{2603}"</code>)</p>
</dd>
<dt><code class="parameter">base</code></dt>
<dd>
<p class="para">
The radix (defaults to <code class="literal">10</code>).
</p>
</dd>
</dl>
</div>
<div class="refsect1 returnvalues" id="refsect1-intlchar.digit-returnvalues">
<h3 class="title">返回值</h3>
<p class="para">
Returns the numeric value represented by the character in the specified radix,
or <strong><code><a href="reserved.constants.php#constant.false">false</a></code></strong> if there is no value or if the value exceeds the radix. Returns <strong><code><a href="reserved.constants.php#constant.null">null</a></code></strong> on failure.
</p>
<div class="warning"><strong class="warning">警告</strong><p class="simpara">此函数可能返回布尔值
<strong><code><a href="reserved.constants.php#constant.false">false</a></code></strong>，但也可能返回等同于 <strong><code><a href="reserved.constants.php#constant.false">false</a></code></strong> 的非布尔值。请阅读 <a href="language.types.boolean.php" class="link">布尔类型</a>章节以获取更多信息。应使用
<a href="language.operators.comparison.php" class="link">===
运算符</a>来测试此函数的返回值。</p></div>
</div>
<div class="refsect1 examples" id="refsect1-intlchar.digit-examples">
<h3 class="title">示例</h3>
<div class="example" id="example-2678">
<p><strong>示例 #1 Testing different code points</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">IntlChar</span><span style="color: #007700">::</span><span style="color: #0000BB">digit</span><span style="color: #007700">(</span><span style="color: #DD0000">"0"</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">IntlChar</span><span style="color: #007700">::</span><span style="color: #0000BB">digit</span><span style="color: #007700">(</span><span style="color: #DD0000">"3"</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">IntlChar</span><span style="color: #007700">::</span><span style="color: #0000BB">digit</span><span style="color: #007700">(</span><span style="color: #DD0000">"A"</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">IntlChar</span><span style="color: #007700">::</span><span style="color: #0000BB">digit</span><span style="color: #007700">(</span><span style="color: #DD0000">"A"</span><span style="color: #007700">, </span><span style="color: #0000BB">16</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">?></span></span></code></div>
</div>
<div class="example-contents"><p>以上示例会输出：</p></div>
<div class="example-contents screen">
<div class="examplescode"><pre class="examplescode">int(0)
int(3)
bool(false)
int(10)</pre>
</div>
</div>
</div>
</div>
<div class="refsect1 seealso" id="refsect1-intlchar.digit-seealso">
<h3 class="title">参见</h3>
<p class="para">
<ul class="simplelist">
<li><span class="function"><a href="intlchar.fordigit.php" class="function" rel="rdfs-seeAlso">IntlChar::forDigit()</a> - Get character representation for a given digit and radix</span></li>
<li><span class="function"><a href="intlchar.chardigitvalue.php" class="function" rel="rdfs-seeAlso">IntlChar::charDigitValue()</a> - Get the decimal digit value of a decimal digit character</span></li>
<li><span class="function"><a href="intlchar.isdigit.php" class="function" rel="rdfs-seeAlso">IntlChar::isdigit()</a> - Check if code point is a digit character</span></li>
<li><strong><code><a href="class.intlchar.php#intlchar.constants.property-numeric-type">IntlChar::PROPERTY_NUMERIC_TYPE</a></code></strong></li>
</ul>
</p>
</div>
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