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						<h1>php怎么去除字符串中的所有大写字母</h1>
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							<i class="layui-icon" title="添加时间">&#xe60e;</i>2022-09-26 19:59:14
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									<p>两种去除方法：1、利用preg_replace()执行正则表达式搜索所有大写字母并将其替换为空字符即可，语法“preg_replace(&#39;/[A-Z]/&#39;,&#39;&#39;,$str)”。2、利用preg_filter()执行正则表达式搜索所有大写字母并将其替换为空字符即可，语法“preg_filter(&#39;/[A-Z]/&#39;,&#39;&#39;,$str)”。</p>
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								</blockquote>
								<p>本教程操作环境：windows7系统、PHP8.1版、DELL G3电脑</p>
								<p>在php中，可以利用preg_replace()或preg_filter()配合正则表达式来去除字符串中的所有大写字母。</p>
								<blockquote>
									<p>使用到的正则表达式：<code>/[A-Z]/</code>
									</p>
									<p>作用：搜索所有大写字母</p>
								</blockquote>
								<p>
									<strong>
										<span style="font-size: 18px;">方法1：使用preg_replace()进行正则替换</span>
									</strong>
								</p>
								<p>preg_replace() 函数可以执行正则表达式的搜索和替换</p>
								<p>只需要利用preg_replace()执行正则表达式搜索所有大写字母并将其替换为空字符即可。</p>
								<pre class="brush:html;toolbar:false">&lt;?php
header(&#39;content-type:text/html;charset=utf-8&#39;);  
function f($str)
{
    $pattern = &#39;/[A-Z]/&#39;;
	$replacement = &#39;&#39;;
    echo preg_replace($pattern, $replacement, $str).&quot;&lt;br&gt;&quot;;

}
$str=&#39;Hello World&#39;;
var_dump($str);
f($str);

$str=&#39;abCdEfG&#39;;
var_dump($str);
f($str);

?&gt;</pre>
								<p>
									<img src="https://img.php.cn/upload/image/724/751/208/1664193292449731.png" title="1664193292449731.png" alt="1.png" />
								</p>
								<p>
									<strong>
										<span style="font-size: 18px;">方法2：使用preg_filter()进行正则替换</span>
									</strong>
								</p>
								<p>preg_filter()和preg_replace() 函数一样，可以执行正则表达式的搜索和替换。</p>
								<p>只需执行正则表达式搜索所有大写字母并将其替换为空字符即可。</p>
								<pre class="brush:php;toolbar:false">&lt;?php
header(&#39;content-type:text/html;charset=utf-8&#39;);  
function f($str)
{
    $pattern = &#39;/[A-Z]/&#39;;
	$replacement = &#39;&#39;;
    echo &quot;处理后：&quot;.preg_filter($pattern, $replacement, $str).&quot;&lt;br&gt;&lt;br&gt;&quot;;

}
$str=&#39;Hello World&#39;;
echo &quot;原字符串：&quot;.$str.&quot;&lt;br&gt;&quot;;
f($str);

$str=&#39;abCdEfG&#39;;
echo &quot;原字符串：&quot;.$str.&quot;&lt;br&gt;&quot;;
f($str);

?&gt;</pre>
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									<img src="https://img.php.cn/upload/image/655/569/903/1664193365566692.png" title="1664193365566692.png" alt="2.png" />
								</p>
								<p>
									<strong>说明： preg_replace() 和 preg_filter() 的区别</strong>
								</p>
								<p>preg_filter() 函数只返回匹配成功的结果，而 preg_replace() 返回所有结果，不管是否匹配成功。</p>
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