trim
从字符串的开头和结尾去除空格(或其他字符)
简体中文
简体中文
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">$str</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"Hed!"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token delimiter important">?></span></span>
移除字符串两侧的空格：
<span class="token php language-php"><span class="token delimiter important"><?php</span> <span class="token variable">$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!
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!
