什么是php的opcache ? 你又是怎么样去运用的呢？
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<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;">https://www.mano100.cn/thread-1942-1-1.html</span></strong></span></p>PHP OPCache（Opcode Cache）是一种用于<span style="color: black;">加强</span> PHP 脚本性能的缓存技术。它工作在 PHP 解释器和服务器之间，用于存储编译后的 PHP 代码（<span style="color: black;">叫作</span>为 Opcode），以便下次请求时<span style="color: black;">能够</span>直接<span style="color: black;">运用</span>，从而减少了重复的解析和编译过程，<span style="color: black;">加强</span>了脚本的执行速度。当 PHP 文件被解析和编译后，生成的 Opcode 存储在内存中。下次请求相同的 PHP 文件时，PHP OPCache <span style="color: black;">能够</span>直接从内存中读取 Opcode，而无需重新解析和编译，从而加快了代码执行速度。这<span style="color: black;">针对</span>高流量的 Web 应用和频繁执行的脚本<span style="color: black;">尤其</span>有益。PHP OPCache 是在 PHP 5.5 之后的版本中默认开启的，但<span style="color: black;">亦</span><span style="color: black;">能够</span><span style="color: black;">经过</span>配置进行优化和<span style="color: black;">掌控</span>。<span style="color: black;"><strong style="color: blue;"><span style="color: black;">opcache<span style="color: black;">重点</span>用在哪个<span style="color: black;">地区</span>？</span></strong></span>OPcache（Opcode Cache）是 PHP 的一个内置扩展，<span style="color: black;">重点</span>用于缓存 PHP 代码的编译结果，以<span style="color: black;">加强</span> PHP 脚本的执行性能。OPcache 在以下几个方面起到了关键<span style="color: black;">功效</span>：<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">代码缓存：</strong>PHP 是一种解释性语言，每次执行 PHP 脚本时，都需要将代码解析、编译成中间码（opcode）并执行。OPcache 缓存了已编译的中间码，避免了每次请求都需要重新编译代码，从而<span style="color: black;">明显</span><span style="color: black;">加强</span>了代码的执行速度。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">减少 IO 开销：</strong> 缓存代码<span style="color: black;">寓意</span>着文件<span style="color: black;">再也不</span>需要频繁地读取和解析，从而减少了文件 IO 开销，<span style="color: black;">加强</span>了整体性能。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">降低 CPU 开销：</strong>编译过程是一种耗费 CPU 资源的操作。OPcache 缓存避免了重复的编译过程，从而减少了 CPU 开销。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">减少内存<span style="color: black;">运用</span>：</strong> 缓存的中间码<span style="color: black;">一般</span>占用比完整 PHP 脚本更少的内存，<span style="color: black;">因此呢</span><span style="color: black;">能够</span>降低内存<span style="color: black;">运用</span>，<span style="color: black;">同期</span><span style="color: black;">亦</span>降低了垃圾收集的频率。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">加强</span>并发能力：</strong> 缓存的代码执行速度更快，<span style="color: black;">寓意</span>着服务器<span style="color: black;">能够</span>处理<span style="color: black;">更加多</span>的并发请求，<span style="color: black;">加强</span>了 Web 应用程序的并发能力。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">加速框架：</strong><span style="color: black;">针对</span><span style="color: black;">运用</span>框架的应用，OPcache <span style="color: black;">能够</span>加速框架的初始化过程，<span style="color: black;">由于</span>框架的核心代码<span style="color: black;">一般</span>只需要初始化一次。</p><span style="color: black;"><strong style="color: blue;"><span style="color: black;">怎样</span><span style="color: black;">运用</span> PHP OPCache：</strong></span><span style="color: black;"><strong style="color: blue;"><span style="color: black;">检测</span> OPCache <span style="color: black;">是不是</span>已启用：</strong></span><span style="color: black;">首要</span>，您需要<span style="color: black;">保证</span>您的 PHP 安装中<span style="color: black;">已然</span>启用了 OPCache。在 php.ini 配置文件中，您<span style="color: black;">能够</span>找到以下设置来确认 OPCache <span style="color: black;">是不是</span>已启用：<span style="color: black;">zend_extension</span>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">=opcache</p><strong style="color: blue;">配置 OPCache：</strong>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">默认<span style="color: black;">状况</span>下，PHP OPCache <span style="color: black;">已然</span>配置为<span style="color: black;">供给</span><span style="color: black;">恰当</span>的性能。<span style="color: black;">然则</span>，您<span style="color: black;">能够</span><span style="color: black;">按照</span>您的<span style="color: black;">需要</span>进行<span style="color: black;">有些</span>优化。以下是<span style="color: black;">有些</span><span style="color: black;">平常</span>的配置选项：opcache.enable=1</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">opcache.memory_consumption=128</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">opcache.max_accelerated_files=10000</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">opcache.validate_timestamps=0</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">opcache.memory_consumption：用于配置 OPCache <span style="color: black;">运用</span>的内存量。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">opcache.max_accelerated_files：指定最大缓存的文件数目。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">opcache.validate_timestamps：指定<span style="color: black;">是不是</span>在每次请求时验证文件的时间戳。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">重视</span>：在生产环境中，应<span style="color: black;">按照</span>服务器配置进行适当的<span style="color: black;">调节</span>。</p><strong style="color: blue;">查看 OPCache 状态：</strong>您<span style="color: black;">能够</span><span style="color: black;">运用</span> opcache_get_status() 函数来获取当前 OPCache 的状态和统计信息。这<span style="color: black;">能够</span><span style="color: black;">帮忙</span>您<span style="color: black;">监测</span> OPCache 的性能和<span style="color: black;">运用</span><span style="color: black;">状况</span>。statusE61EopcacheE95EgetE95Estatus()<span style="color: black;">p</span><span style="color: black;">r</span><span style="color: black;">i</span><span style="color: black;">n</span><span style="color: black;">t</span>
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<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">EEr</p></span class="mord mathit" style="margin-right:0.02778em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.02778em;"></span class="mord mathit"></span class="mspace" style="margin-right:0.16666666666666666em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.03588em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit" style="margin-right:0.05764em;"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="mord mathit"></span class="strut" style="height:1em;vertical-align:-0.25em;"></span class="katex-html" aria-hidden="true"><strong style="color: blue;">清除 OPCache：</strong>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">倘若</span>您对代码进行了更改，可能需要手动清除 OPCache，以便让新代码生效。您<span style="color: black;">能够</span><span style="color: black;">运用</span> opcache_reset() 函数来清除<span style="color: black;">全部</span> OPCache 缓存。opcache_reset();</p>总之，PHP OPCache 是一个重要的性能优化工具，它<span style="color: black;">能够</span><span style="color: black;">明显</span><span style="color: black;">加强</span> PHP 脚本的执行速度，<span style="color: black;">尤其</span>是在高流量的 Web 应用中。<span style="color: black;">经过</span>适当的配置和监控，您<span style="color: black;">能够</span>最大程度地发挥 OPCache 的<span style="color: black;">优良</span>，<span style="color: black;">供给</span>更好的用户体验。<img src="https://mmbiz.qpic.cn/mmbiz_gif/X36HLl2EicOfbCTTtzwpbdicOhvibmKu9O9jGSLPicT5IVjk2U8YETibumKAAa5K55Y3mdvGOvhjfbUGdEibKx8E5BJQ/640?wx_fmt=gif&wxfrom=5&wx_lazy=1&tp=webp" style="width: 50%; margin-bottom: 20px;"><strong style="color: blue;"><span style="color: black;">参考链接:</span></strong><span style="color: black;"><span style="color: black;">以上<span style="color: black;">便是</span>本篇分钟的<span style="color: black;">所有</span>内容，</span><span style="color: black;"><strong style="color: blue;"><span style="color: black;"><span style="color: black;">期盼</span>各位程序员们<span style="color: black;">奋斗</span><span style="color: black;">提高</span>个人技术。</span></strong></span><span style="color: black;">最后，<span style="color: black;">博主</span>温馨提示：<span style="color: black;">每日</span>阅读5分钟，<span style="color: black;">每日</span>学习一点点，<span style="color: black;">每日</span>进步一点点。</span></span>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/mmbiz_gif/X36HLl2EicOfSLeDjYdhheic53iaMxy6jzuQaBEXzfu12r8KsocY8g1D5GGfcUJ4nibr37JY3ZZBu1wjKiaNxEASXUA/640?wx_fmt=gif&wxfrom=5&wx_lazy=1&tp=webp" style="width: 50%; margin-bottom: 20px;"></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/mmbiz_jpg/uIqA9zdyleyDIhxfbt7DaTT5a4QibDoG9cjrINXv1wpUImSribq2abGGGYeN0j5tsgJ6yQBytrXmUFprtSOA4Ceg/640?wx_fmt=other&tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></span></p>
你的努力一定会被看见，相信自己，加油。 楼主的文章非常有意义，提升了我的知识水平。
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