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118 lines
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118 lines
6.7 KiB
HTML
<!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>使用另一个字符串填充字符串为指定长度</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.str-pad" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">str_pad</h1>
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<p class="verinfo">(PHP 4 >= 4.0.1, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">str_pad</span> — <span class="dc-title">使用另一个字符串填充字符串为指定长度</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.str-pad-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>str_pad</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$input</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$pad_length</code></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$pad_string</code><span class="initializer"> = " "</span></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$pad_type</code><span class="initializer"> = STR_PAD_RIGHT</span></span>
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]] ) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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该函数返回 <code class="parameter">input</code> 被从左端、右端或者同时两端被填充到制定长度后的结果。如果可选的 <code class="parameter">pad_string</code> 参数没有被指定，<code class="parameter">input</code> 将被空格字符填充，否则它将被 <code class="parameter">pad_string</code> 填充到指定长度。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.str-pad-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">input</code></dt>
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<dd>
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<p class="para">
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输入字符串。
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</p>
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</dd>
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<dt>
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<code class="parameter">pad_length</code></dt>
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<dd>
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<p class="para">
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如果 <code class="parameter">pad_length</code> 的值是负数，小于或者等于输入字符串的长度，不会发生任何填充，并会返回 <code class="parameter">input</code> 。
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</p>
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</dd>
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<dt>
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<code class="parameter">pad_string</code></dt>
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<dd>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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如果填充字符的长度不能被 <code class="parameter">pad_string</code> 整除，那么 <code class="parameter">pad_string</code> 可能会被缩短。
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</p>
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</p></blockquote>
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</dd>
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<dt>
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<code class="parameter">pad_type</code></dt>
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<dd>
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<p class="para">
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可选的 <code class="parameter">pad_type</code> 参数的可能值为 <strong><code>STR_PAD_RIGHT</code></strong>，<strong><code>STR_PAD_LEFT</code></strong> 或 <strong><code>STR_PAD_BOTH</code></strong>。如果没有指定 <code class="parameter">pad_type</code>，则假定它是 <strong><code>STR_PAD_RIGHT</code></strong>。
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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.str-pad-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回填充后的字符串。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.str-pad-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-5954">
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<p><strong>Example #1 <span class="function"><strong>str_pad()</strong></span> 范例</strong></p>
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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 />$input </span><span style="color: #007700">= </span><span style="color: #DD0000">"Alien"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">str_pad</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">); </span><span style="color: #FF8000">// 输出 "Alien "<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">str_pad</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">, </span><span style="color: #DD0000">"-="</span><span style="color: #007700">, </span><span style="color: #0000BB">STR_PAD_LEFT</span><span style="color: #007700">); </span><span style="color: #FF8000">// 输出 "-=-=-Alien"<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">str_pad</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">, </span><span style="color: #DD0000">"_"</span><span style="color: #007700">, </span><span style="color: #0000BB">STR_PAD_BOTH</span><span style="color: #007700">); </span><span style="color: #FF8000">// 输出 "__Alien___"<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">str_pad</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">6</span><span style="color: #007700">, </span><span style="color: #DD0000">"___"</span><span style="color: #007700">); </span><span style="color: #FF8000">// 输出 "Alien_"<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">str_pad</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #DD0000">"*"</span><span style="color: #007700">); </span><span style="color: #FF8000">// 输出 "Alien"<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></div></div></body></html> |