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- <title>解析 URL,返回其组成部分</title>
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- <div class="refnamediv">
- <h1 class="refname">parse_url</h1>
- <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">parse_url</span> — <span class="dc-title">解析 URL,返回其组成部分</span></p>
- </div>
-
- <div class="refsect1 description" id="refsect1-function.parse-url-description">
- <h3 class="title">说明</h3>
- <div class="methodsynopsis dc-description">
- <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <span class="methodname"><strong>parse_url</strong></span>
- ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$url</code></span>
- [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$component</code><span class="initializer"> = -1</span></span>
- ] )</div>
- <p class="para rdfs-comment">
- 本函数解析一个 URL 并返回一个关联数组,包含在 URL 中出现的各种组成部分。
- </p>
- <p class="para">
- 本函数<em class="emphasis">不是</em>用来验证给定 URL
- 的合法性的,只是将其分解为下面列出的部分。不完整的 URL
- 也被接受, <span class="function"><strong>parse_url()</strong></span> 会尝试尽量正确地将其解析。
- </p>
- </div>
- <div class="refsect1 parameters" id="refsect1-function.parse-url-parameters">
- <h3 class="title">参数</h3>
- <p class="para">
- <dl>
- <dt>
- <span class="term"><em><code class="parameter">url</code></em></span>
- <dd>
- <p class="para">
- 要解析的 URL。无效字符将使用
- <em>_</em> 来替换。
- </p>
- </dd>
- </dt>
- </dl>
- <dl>
- <dt>
- <span class="term"><em><code class="parameter">component</code></em></span>
- <dd>
- <p class="para">
- 指定 <strong><code>PHP_URL_SCHEME</code></strong>、
- <strong><code>PHP_URL_HOST</code></strong>、 <strong><code>PHP_URL_PORT</code></strong>、
- <strong><code>PHP_URL_USER</code></strong>、 <strong><code>PHP_URL_PASS</code></strong>、
- <strong><code>PHP_URL_PATH</code></strong>、 <strong><code>PHP_URL_QUERY</code></strong>
- 或 <strong><code>PHP_URL_FRAGMENT</code></strong> 的其中一个来获取 URL 中指定的部分的 <span class="type"><a href="language.types.string.html" class="type string">string</a></span>。 (除了指定为 <strong><code>PHP_URL_PORT</code></strong> 后,将返回一个 <span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span> 的值)。
- </p>
- </dd>
- </dt>
- </dl>
- </p>
- </div>
- <div class="refsect1 returnvalues" id="refsect1-function.parse-url-returnvalues">
- <h3 class="title">返回值</h3>
- <p class="para">
- 对严重不合格的 URL, <span class="function"><strong>parse_url()</strong></span> 可能会返回
- <strong><code>FALSE</code></strong>。
- </p>
- <p class="para">
- 如果省略了 <em><code class="parameter">component</code></em> 参数,将返回一个关联数组 <span class="type"><a href="language.types.array.html" class="type array">array</a></span>,在目前至少会有一个元素在该数组中。数组中可能的键有以下几种:
- <ul class="itemizedlist">
- <li class="listitem">
- <span class="simpara">
- <var class="varname"><var class="varname">scheme</var></var> - 如 http
- </span>
- </li>
- <li class="listitem">
- <span class="simpara">
- <var class="varname"><var class="varname">host</var></var>
- </span>
- </li>
- <li class="listitem">
- <span class="simpara">
- <var class="varname"><var class="varname">port</var></var>
- </span>
- </li>
- <li class="listitem">
- <span class="simpara">
- <var class="varname"><var class="varname">user</var></var>
- </span>
- </li>
- <li class="listitem">
- <span class="simpara">
- <var class="varname"><var class="varname">pass</var></var>
- </span>
- </li>
- <li class="listitem">
- <span class="simpara">
- <var class="varname"><var class="varname">path</var></var>
- </span>
- </li>
- <li class="listitem">
- <span class="simpara">
- <var class="varname"><var class="varname">query</var></var> - 在问号 <em>?</em> 之后
- </span>
- </li>
- <li class="listitem">
- <span class="simpara">
- <var class="varname"><var class="varname">fragment</var></var> - 在散列符号 <em>#</em> 之后
- </span>
- </li>
- </ul>
- </p>
- <p class="para">
- 如果指定了 <em><code class="parameter">component</code></em> 参数,
- <span class="function"><strong>parse_url()</strong></span> 返回一个 <span class="type"><a href="language.types.string.html" class="type string">string</a></span> (或在指定为 <strong><code>PHP_URL_PORT</code></strong> 时返回一个 <span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)而不是 <span class="type"><a href="language.types.array.html" class="type array">array</a></span>。如果 URL 中指定的组成部分不存在,将会返回 <strong><code>NULL</code></strong>。
- </p>
- </div>
- <div class="refsect1 changelog" id="refsect1-function.parse-url-changelog">
- <h3 class="title">更新日志</h3>
- <p class="para">
- <table class="doctable informaltable">
-
- <thead>
- <tr>
- <th>版本</th>
- <th>说明</th>
- </tr>
- </thead>
- <tbody class="tbody">
- <tr>
- <td>5.4.7</td>
- <td>
- 修复了 <em class="emphasis">host</em> 在 <em class="emphasis">协议</em> 省略时的识别。
- </td>
- </tr>
- <tr>
- <td>5.3.3</td>
- <td>
- 在 URL 解析失败时将不会产生 <strong><code>E_WARNING</code></strong> 级别的错误。
- </td>
- </tr>
- <tr>
- <td>5.1.2</td>
- <td>增加了参数 <em><code class="parameter">component</code></em>。</td>
- </tr>
- </tbody>
-
- </table>
- </p>
- </div>
- <div class="refsect1 examples" id="refsect1-function.parse-url-examples">
- <h3 class="title">范例</h3>
- <p class="para">
- <div class="example" id="example-3878">
- <p><strong>Example #1 <span class="function"><strong>parse_url()</strong></span> 例子</strong></p>
- <div class="example-contents">
- <div class="phpcode"><code><span style="color: #000000">
- <span style="color: #0000BB"><?php<br />$url </span><span style="color: #007700">= </span><span style="color: #DD0000">'http://username:password@hostname/path?arg=value#anchor'</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">parse_url</span><span style="color: #007700">(</span><span style="color: #0000BB">$url</span><span style="color: #007700">));<br /><br />echo </span><span style="color: #0000BB">parse_url</span><span style="color: #007700">(</span><span style="color: #0000BB">$url</span><span style="color: #007700">, </span><span style="color: #0000BB">PHP_URL_PATH</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
- </span>
- </code></div>
- </div>
- <div class="example-contents"><p>以上例程会输出:</p></div>
- <div class="example-contents screen">
- <div class="cdata"><pre>
- Array
- (
- [scheme] => http
- [host] => hostname
- [user] => username
- [pass] => password
- [path] => /path
- [query] => arg=value
- [fragment] => anchor
- )
- /path
- </pre></div>
- </div>
- </div>
- </p>
- <p class="para">
- <div class="example" id="example-3879">
- <p><strong>Example #2 <span class="function"><strong>parse_url()</strong></span> 解析丢失协议的例子</strong></p>
- <div class="example-contents">
- <div class="phpcode"><code><span style="color: #000000">
- <span style="color: #0000BB"><?php<br />$url </span><span style="color: #007700">= </span><span style="color: #DD0000">'//www.example.com/path?googleguy=googley'</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// 在 5.4.7 之前这会输出路径 "//www.example.com/path"<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">parse_url</span><span style="color: #007700">(</span><span style="color: #0000BB">$url</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">?></span>
- </span>
- </code></div>
- </div>
- <div class="example-contents"><p>以上例程会输出:</p></div>
- <div class="example-contents screen">
- <div class="cdata"><pre>
- array(3) {
- ["host"]=>
- string(15) "www.example.com"
- ["path"]=>
- string(5) "/path"
- ["query"]=>
- string(17) "googleguy=googley"
- }
- </pre></div>
- </div>
- </div>
- </p>
- </div>
- <div class="refsect1 notes" id="refsect1-function.parse-url-notes">
- <h3 class="title">注释</h3>
- <blockquote class="note"><p><strong class="note">Note</strong>:
- <p class="para">
- 本函数不能用于相对 URL。
- </p>
- </p></blockquote>
- <blockquote class="note"><p><strong class="note">Note</strong>:
- <p class="para">
- <span class="function"><strong>parse_url()</strong></span> 是专门用来解析 URL 而不是 URI 的。不过为遵从 PHP
- 向后兼容的需要有个例外,对 file:// 协议允许三个斜线(file:///...)。其它任何协议都不能这样。
- </p>
- </p></blockquote>
- </div>
- <div class="refsect1 seealso" id="refsect1-function.parse-url-seealso">
- <h3 class="title">参见</h3>
- <p class="para">
- <ul class="simplelist">
- <li class="member"> <span class="function"><a href="function.pathinfo.html" class="function" rel="rdfs-seeAlso">pathinfo()</a> - 返回文件路径的信息</span></li>
- <li class="member"> <span class="function"><a href="function.parse-str.html" class="function" rel="rdfs-seeAlso">parse_str()</a> - 将字符串解析成多个变量</span></li>
- <li class="member"> <span class="function"><a href="function.http-build-query.html" class="function" rel="rdfs-seeAlso">http_build_query()</a> - 生成 URL-encode 之后的请求字符串</span></li>
- <li class="member"> <span class="function"><a href="function.http-build-url.html" class="function" rel="rdfs-seeAlso">http_build_url()</a> - 产生一个 URL</span></li>
- <li class="member"> <span class="function"><a href="function.dirname.html" class="function" rel="rdfs-seeAlso">dirname()</a> - 返回路径中的目录部分</span></li>
- <li class="member"> <span class="function"><a href="function.basename.html" class="function" rel="rdfs-seeAlso">basename()</a> - 返回路径中的文件名部分</span></li>
- <li class="member"><a href="http://www.faqs.org/rfcs/rfc3986" class="link external">» RFC 3986</a></li>
- </ul>
- </p>
- </div>
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