trim

实例

例子 1

移除字符串两侧的字符（"Hello" 中的 "He" 以及 "World" 中的 "d!"）：

<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">trim</span><span class="token punctuation">(</span><span class="token variable">$str</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"Hed!"</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

移除字符串两侧的空格：

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

以上代码的 HTML 输出如下（请查看源代码）：

<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 trim<span class="token punctuation">:</span>  Hello World<span class="token operator">!</span> <span class="token operator"><</span>br<span class="token operator">></span>使用 trim<span class="token punctuation">:</span> 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>

以上代码的浏览器输出如下：

不使用 trim: Hello World!
使用 trim: Hello World!

亲自试一试

例子 3

移除字符串两侧的换行符（\n）：

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

以上代码的 HTML 输出如下（请查看源代码）：

<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 trim<span class="token punctuation">:</span>


Hello World<span class="token operator">!</span>


<span class="token operator"><</span>br<span class="token operator">></span>使用 trim<span class="token punctuation">:</span> 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>

以上代码的浏览器输出如下：

不使用 trim: Hello World!
使用 trim: Hello World!

亲自试一试