rtrim

實例

例子1

從字符串右側移除字符：

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

移除字符串右側的空格：

 <span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$str</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"Hello World! "</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"不使用rtrim："</span> <span class="token operator">.</span> <span class="token variable">$str</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"使用rtrim："</span> <span class="token operator">.</span> <span class="token function">rtrim</span> <span class="token punctuation">(</span> <span class="token variable">$str</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

以上代碼的HTML 輸出如下（查看源代碼）：

 <span class="token operator"><</span> <span class="token operator">!</span> <span class="token constant">DOCTYPE</span> html <span class="token operator">></span>
<span class="token operator"><</span> html <span class="token operator">></span>
<span class="token operator"><</span> body <span class="token operator">></span>

不使用rtrim：Hello World <span class="token operator">!</span> <span class="token operator"><</span> br <span class="token operator">></span>使用rtrim：Hello World <span class="token operator">!</span>
<span class="token operator"><</span> <span class="token operator">/</span> body <span class="token operator">></span>
<span class="token operator"><</span> <span class="token operator">/</span> html <span class="token operator">></span>

以上代碼的瀏覽器輸出：

不使用rtrim：Hello World!
使用rtrim：Hello World!

親自試一試

例子3

移除字符串右側的換行符（\n）：

 <span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$str</span> <span class="token operator">=</span> <span class="token string double-quoted-string">"Hello World!\n\n\n"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"不使用rtrim："</span> <span class="token operator">.</span> <span class="token variable">$str</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"<br>"</span> <span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token string double-quoted-string">"使用rtrim："</span> <span class="token operator">.</span> <span class="token function">rtrim</span> <span class="token punctuation">(</span> <span class="token variable">$str</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

以上代碼的HTML 輸出如下（查看源代碼）：

 <span class="token operator"><</span> <span class="token operator">!</span> <span class="token constant">DOCTYPE</span> html <span class="token operator">></span>
<span class="token operator"><</span> html <span class="token operator">></span>
<span class="token operator"><</span> body <span class="token operator">></span>

不使用rtrim：Hello World <span class="token operator">!</span>


<span class="token operator"><</span> br <span class="token operator">></span>使用rtrim：Hello World <span class="token operator">!</span>
<span class="token operator"><</span> <span class="token operator">/</span> body <span class="token operator">></span>
<span class="token operator"><</span> <span class="token operator">/</span> html <span class="token operator">></span>

以上代碼的瀏覽器輸出：

不使用rtrim：Hello World!
使用rtrim：Hello World!

親自試一試