str_pad

名称:str_pad

分类:字符串

所属语言:php

一句话介绍:把字符串填充为新的长度。

实例

例子 1

填充字符串的右侧，到 30 个字符的新长度：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$str</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"Hello World"</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token function">str_pad</span><span class="token punctuation">(</span><span class="token variable">$str</span><span class="token punctuation">,</span><span class="token number">30</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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例子 2

填充字符串的左侧：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$str</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"Hello World"</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token function">str_pad</span><span class="token punctuation">(</span><span class="token variable">$str</span><span class="token punctuation">,</span><span class="token number">30</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"."</span><span class="token punctuation">,</span><span class="token constant">STR_PAD_LEFT</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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例子 3

填充字符串的两侧：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$str</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"Hello World"</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token function">str_pad</span><span class="token punctuation">(</span><span class="token variable">$str</span><span class="token punctuation">,</span><span class="token number">30</span><span class="token punctuation">,</span><span class="token string double-quoted-string">".:"</span><span class="token punctuation">,</span><span class="token constant">STR_PAD_BOTH</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

亲自试一试