https://blog.xxchenchen.top/wiki/web%E5%AE%89%E5%85%A8/%E8%AF%AD%E8%A8%80%E7%89%B9%E6%80%A7/php/ Recent content in PHP on ChenOvo Hugo -- gohugo.io en-us ChenOvo Mon, 13 Apr 2026 08:48:31 +0800 https://blog.xxchenchen.top/wiki/web%E5%AE%89%E5%85%A8/%E8%AF%AD%E8%A8%80%E7%89%B9%E6%80%A7/php/%E5%87%BD%E6%95%B0%E5%AD%A6%E4%B9%A0/ Mon, 13 Apr 2026 08:48:31 +0800 https://blog.xxchenchen.top/wiki/web%E5%AE%89%E5%85%A8/%E8%AF%AD%E8%A8%80%E7%89%B9%E6%80%A7/php/%E5%87%BD%E6%95%B0%E5%AD%A6%E4%B9%A0/ <div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span><span class="lnt">2 </span><span class="lnt">3 </span><span class="lnt">4 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-PHP" data-lang="PHP"><span class="line"><span class="cl"><span class="nx">函数学习————substr</span> </span></span><span class="line"><span class="cl"> </span></span><span class="line"><span class="cl"><span class="nx">string</span> <span class="nx">substr</span> <span class="p">(</span> <span class="nx">string</span> <span class="nv">$string</span> <span class="p">,</span> <span class="nx">int</span> <span class="nv">$start</span> <span class="p">[,</span> <span class="nx">int</span> <span class="nv">$length</span> <span class="p">]</span> <span class="p">)</span> </span></span><span class="line"><span class="cl"><span class="nx">\</span><span class="c1">#返回字符串 string 由 start 和 length 参数指定的子字符串。 </span></span></span></code></pre></td></tr></table> </div> </div><div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span><span class="lnt">2 </span><span class="lnt">3 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-PHP" data-lang="PHP"><span class="line"><span class="cl"><span class="nx">函数学习————intval</span> </span></span><span class="line"><span class="cl"><span class="nx">int</span> <span class="nx">intval</span><span class="p">(</span> <span class="nx">mixed</span> <span class="nv">$var</span><span class="p">[,</span> <span class="nx">int</span> <span class="nv">$base</span> <span class="o">=</span> <span class="mi">10</span><span class="p">]</span> <span class="p">)</span> </span></span><span class="line"><span class="cl"><span class="nx">\</span><span class="c1">#通过使用指定的进制 base 转换（默认是十进制），返回变量 var 的 integer 数值。 </span></span></span></code></pre></td></tr></table> </div> </div><div class="highlight"><div class="chroma"> <table class="lntable"><tr><td class="lntd"> <pre tabindex="0" class="chroma"><code><span class="lnt">1 </span><span class="lnt">2 </span><span class="lnt">3 </span><span class="lnt">4 </span><span class="lnt">5 </span></code></pre></td> <td class="lntd"> <pre tabindex="0" class="chroma"><code class="language-PHP" data-lang="PHP"><span class="line"><span class="cl"><span class="nx">函数学习————mt_srand</span><span class="p">()</span> </span></span><span class="line"><span class="cl"><span class="nx">void</span> <span class="nx">mt_srand</span><span class="p">([</span> <span class="nx">int</span> <span class="nv">$seed</span><span class="p">]</span> <span class="p">)</span> </span></span><span class="line"><span class="cl"><span class="nx">\</span><span class="c1">#用 seed 来给随机数发生器播种。 没有设定 seed 参数时，会被设为随时数。 </span></span></span><span class="line"><span class="cl"><span class="nx">\</span><span class="c1">#Note: 自 PHP 4.2.0 起，不再需要用 srand() 或 mt_srand() 给随机数发生器播种 </span></span></span><span class="line"><span class="cl"><span class="nx">\</span><span class="c1">#因为现在是由系统自动完成的。 </span></span></span></code></pre></td></tr></table> </div> </div>