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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Determine accessibility of a file</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.posix-access" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">posix_access</h1>
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<p class="verinfo">(PHP 5 >= 5.1.0, PHP 7)</p><p class="refpurpose"><span class="refname">posix_access</span> — <span class="dc-title">
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Determine accessibility of a file
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.posix-access-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>posix_access</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$file</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$mode</code><span class="initializer"> = POSIX_F_OK</span></span>
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] ) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>posix_access()</strong></span> checks the user's permission of a file.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.posix-access-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">file</code></dt>
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<dd>
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<p class="para">
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The name of the file to be tested.
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</p>
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</dd>
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<dt>
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<code class="parameter">mode</code></dt>
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<dd>
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<p class="para">
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A mask consisting of one or more of <strong><code>POSIX_F_OK</code></strong>,
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<strong><code>POSIX_R_OK</code></strong>, <strong><code>POSIX_W_OK</code></strong> and
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<strong><code>POSIX_X_OK</code></strong>.
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</p>
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<p class="para">
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<strong><code>POSIX_R_OK</code></strong>, <strong><code>POSIX_W_OK</code></strong> and
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<strong><code>POSIX_X_OK</code></strong> request checking whether the file
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exists and has read, write and execute permissions, respectively.
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<strong><code>POSIX_F_OK</code></strong> just requests checking for the
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existence of the file.
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.posix-access-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.posix-access-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-4331">
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<p><strong>Example #1 <span class="function"><strong>posix_access()</strong></span> example</strong></p>
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<div class="example-contents"><p>
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This example will check if the $file is readable and writable, otherwise
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will print an error message.
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</p></div>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br />$file </span><span style="color: #007700">= </span><span style="color: #DD0000">'some_file'</span><span style="color: #007700">;<br /><br />if (</span><span style="color: #0000BB">posix_access</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">, </span><span style="color: #0000BB">POSIX_R_OK </span><span style="color: #007700">| </span><span style="color: #0000BB">POSIX_W_OK</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">'The file is readable and writable!'</span><span style="color: #007700">;<br /><br />} else {<br /> </span><span style="color: #0000BB">$error </span><span style="color: #007700">= </span><span style="color: #0000BB">posix_get_last_error</span><span style="color: #007700">();<br /><br /> echo </span><span style="color: #DD0000">"Error </span><span style="color: #0000BB">$error</span><span style="color: #DD0000">: " </span><span style="color: #007700">. </span><span style="color: #0000BB">posix_strerror</span><span style="color: #007700">(</span><span style="color: #0000BB">$error</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.posix-access-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">当启用
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<a href="features.safe_mode.html" class="link">安全模式</a>时，
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PHP 会检查被操作的文件或目录是否与被执行的脚本有相同的 UID（所有者）。</span></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.posix-access-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="posix_get_last_error.html" class="function" rel="rdfs-seeAlso">posix_get_last_error()</a> - Retrieve the error number set by the last posix function that failed</span></li>
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<li class="member"><span class="function"><a href="posix_strerror.html" class="function" rel="rdfs-seeAlso">posix_strerror()</a> - Retrieve the system error message associated with the given errno</span></li>
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</ul>
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</p>
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</div>
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Determine accessibility of a file</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.posix-access" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">posix_access</h1>
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<p class="verinfo">(PHP 5 >= 5.1.0, PHP 7)</p><p class="refpurpose"><span class="refname">posix_access</span> — <span class="dc-title">
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Determine accessibility of a file
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.posix-access-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>posix_access</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$file</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$mode</code><span class="initializer"> = POSIX_F_OK</span></span>
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] ) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>posix_access()</strong></span> checks the user's permission of a file.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.posix-access-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">file</code></dt>
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<dd>
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<p class="para">
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The name of the file to be tested.
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</p>
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</dd>
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<dt>
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<code class="parameter">mode</code></dt>
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<dd>
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<p class="para">
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A mask consisting of one or more of <strong><code>POSIX_F_OK</code></strong>,
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<strong><code>POSIX_R_OK</code></strong>, <strong><code>POSIX_W_OK</code></strong> and
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<strong><code>POSIX_X_OK</code></strong>.
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</p>
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<p class="para">
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<strong><code>POSIX_R_OK</code></strong>, <strong><code>POSIX_W_OK</code></strong> and
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<strong><code>POSIX_X_OK</code></strong> request checking whether the file
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exists and has read, write and execute permissions, respectively.
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<strong><code>POSIX_F_OK</code></strong> just requests checking for the
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existence of the file.
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.posix-access-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.posix-access-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-4331">
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<p><strong>Example #1 <span class="function"><strong>posix_access()</strong></span> example</strong></p>
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<div class="example-contents"><p>
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This example will check if the $file is readable and writable, otherwise
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will print an error message.
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</p></div>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br />$file </span><span style="color: #007700">= </span><span style="color: #DD0000">'some_file'</span><span style="color: #007700">;<br /><br />if (</span><span style="color: #0000BB">posix_access</span><span style="color: #007700">(</span><span style="color: #0000BB">$file</span><span style="color: #007700">, </span><span style="color: #0000BB">POSIX_R_OK </span><span style="color: #007700">| </span><span style="color: #0000BB">POSIX_W_OK</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">'The file is readable and writable!'</span><span style="color: #007700">;<br /><br />} else {<br /> </span><span style="color: #0000BB">$error </span><span style="color: #007700">= </span><span style="color: #0000BB">posix_get_last_error</span><span style="color: #007700">();<br /><br /> echo </span><span style="color: #DD0000">"Error </span><span style="color: #0000BB">$error</span><span style="color: #DD0000">: " </span><span style="color: #007700">. </span><span style="color: #0000BB">posix_strerror</span><span style="color: #007700">(</span><span style="color: #0000BB">$error</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.posix-access-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">当启用
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<a href="features.safe_mode.html" class="link">安全模式</a>时，
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PHP 会检查被操作的文件或目录是否与被执行的脚本有相同的 UID（所有者）。</span></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.posix-access-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="posix_get_last_error.html" class="function" rel="rdfs-seeAlso">posix_get_last_error()</a> - Retrieve the error number set by the last posix function that failed</span></li>
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<li class="member"><span class="function"><a href="posix_strerror.html" class="function" rel="rdfs-seeAlso">posix_strerror()</a> - Retrieve the system error message associated with the given errno</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html>
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