如何利用 strval 和 str_ireplace 函数进行不区分大小写的字符串替换？

gitbox 2025-09-12
<span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// 前置无关部分示例</span></span><span>
</span><span><span class="hljs-variable">$timestamp</span></span><span> = </span><span><span class="hljs-title function_ invoke__">time</span></span><span>();
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"当前时间戳：<span class="hljs-subst">$timestamp</span></span></span><span>";
</span><span><span class="hljs-meta">?&gt;</span></span><span>

&lt;hr&gt;

</span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// 正文内容开始</span></span><span>

<span class="hljs-comment">/**
 * 标题: 如何利用 strval 和 str_ireplace 函数进行不区分大小写的字符串替换？
 *
 * 在 PHP 开发中，字符串替换是一个常见操作。尤其是在处理用户输入或者文本内容时，
 * 有时我们需要忽略大小写进行替换。PHP 提供了两个非常有用的函数来实现这个需求：
 * strval 和 str_ireplace。
 *
 * 1. strval 函数
 * strval() 可以将任意数据类型转换为字符串，这在确保替换操作能够顺利进行时非常有用。
 * 示例：
 */</span>

</span><span><span class="hljs-variable">$number</span></span><span> = </span><span><span class="hljs-number">12345</span></span><span>;
</span><span><span class="hljs-variable">$stringNumber</span></span><span> = </span><span><span class="hljs-title function_ invoke__">strval</span></span><span>(</span><span><span class="hljs-variable">$number</span></span><span>);  </span><span><span class="hljs-comment">// 将整数转换为字符串</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"转换后的字符串: <span class="hljs-subst">$stringNumber</span></span></span><span>\n";

<span class="hljs-comment">/**
 * 2. str_ireplace 函数
 * str_ireplace() 是不区分大小写的字符串替换函数，其用法类似于 str_replace()，
 * 但忽略了字母大小写。
 *
 * 函数原型：
 * str_ireplace(mixed $search, mixed $replace, mixed $subject, int &amp;$count = null): mixed
 *
 * 参数说明：
 * - $search: 要查找的字符串或字符串数组。
 * - $replace: 用于替换的字符串或字符串数组。
 * - $subject: 被搜索和替换的目标字符串或数组。
 * - $count: 可选参数，用于接收替换的次数。
 */</span>

<span class="hljs-comment">/**
 * 示例：不区分大小写地替换字符串
 */</span>
</span><span><span class="hljs-variable">$text</span></span><span> = </span><span><span class="hljs-string">"Hello World! hello world!"</span></span><span>;
</span><span><span class="hljs-variable">$search</span></span><span> = </span><span><span class="hljs-string">"HELLO"</span></span><span>;
</span><span><span class="hljs-variable">$replace</span></span><span> = </span><span><span class="hljs-string">"Hi"</span></span><span>;

</span><span><span class="hljs-comment">// 使用 str_ireplace 进行替换</span></span><span>
</span><span><span class="hljs-variable">$result</span></span><span> = </span><span><span class="hljs-title function_ invoke__">str_ireplace</span></span><span>(</span><span><span class="hljs-variable">$search</span></span><span>, </span><span><span class="hljs-variable">$replace</span></span><span>, </span><span><span class="hljs-variable">$text</span></span><span>);

</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"替换后的结果: <span class="hljs-subst">$result</span></span></span><span>\n";
</span><span><span class="hljs-comment">// 输出: "Hi World! Hi world!"</span></span><span>

<span class="hljs-comment">/**
 * 3. 综合使用 strval 和 str_ireplace
 * 有时我们需要替换的内容可能不是字符串，例如从数据库或接口获取的数字或布尔值。
 * 在这种情况下，先使用 strval 将其转换为字符串，再进行不区分大小写的替换。
 */</span>

</span><span><span class="hljs-variable">$input</span></span><span> = </span><span><span class="hljs-number">1001</span></span><span>;
</span><span><span class="hljs-variable">$searchValue</span></span><span> = </span><span><span class="hljs-string">"1001"</span></span><span>;
</span><span><span class="hljs-variable">$replaceValue</span></span><span> = </span><span><span class="hljs-string">"One Thousand One"</span></span><span>;

</span><span><span class="hljs-comment">// 转换为字符串</span></span><span>
</span><span><span class="hljs-variable">$inputStr</span></span><span> = </span><span><span class="hljs-title function_ invoke__">strval</span></span><span>(</span><span><span class="hljs-variable">$input</span></span><span>);

</span><span><span class="hljs-comment">// 进行不区分大小写的替换</span></span><span>
</span><span><span class="hljs-variable">$finalResult</span></span><span> = </span><span><span class="hljs-title function_ invoke__">str_ireplace</span></span><span>(</span><span><span class="hljs-variable">$searchValue</span></span><span>, </span><span><span class="hljs-variable">$replaceValue</span></span><span>, </span><span><span class="hljs-variable">$inputStr</span></span><span>);

</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"最终替换结果: <span class="hljs-subst">$finalResult</span></span></span><span>\n";
</span><span><span class="hljs-comment">// 输出: "One Thousand One"</span></span><span>

<span class="hljs-comment">/**
 * 总结：
 * - strval 用于确保数据是字符串类型，避免类型错误。
 * - str_ireplace 用于不区分大小写地替换字符串，非常适合处理用户输入和文本数据。
 * - 两者结合使用，可以安全、灵活地处理各种类型的数据替换。
 */</span>
</span><span><span class="hljs-meta">?&gt;</span></span><span>
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strval