怎樣使用imagecreatefromxpm函數結合GD庫來實現基本的圖像處理操作？

<span><span><span class="hljs-meta"><?php</span></span><span>
</span><span><span class="hljs-comment">// 這部分與文章內容無關，可以是任何PHP代碼</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"開始執行PHP腳本...\n"</span></span><span>;
</span><span><span class="hljs-title function_ invoke__">date_default_timezone_set</span></span><span>(</span><span><span class="hljs-string">'Asia/Shanghai'</span></span><span>);
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"當前時間："</span></span><span> . </span><span><span class="hljs-title function_ invoke__">date</span></span><span>(</span><span><span class="hljs-string">'Y-m-d H:i:s'</span></span><span>) . </span><span><span class="hljs-string">"\n"</span></span><span>;

</span><span><span class="hljs-meta">?></span></span><span>

<hr>

</span><span><span class="hljs-meta"><?php</span></span><span>
<span class="hljs-comment">/*
文章正文：怎樣使用imagecreatefromxpm函數結合GD庫來實現基本的圖像處理操作？
*/</span>

</span><span><span class="hljs-comment">// 1. 簡介</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<h2>簡介</h2>"</span></span><span>;
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<p>在PHP中，GD庫提供了豐富的圖像處理功能。<strong>imagecreatefromxpm</strong>函數可以從XPM格式的圖像文件創建圖像資源，之後可以對圖像進行基本處理，如繪製、調整顏色或保存為其他格式。</p>"</span></span><span>;

</span><span><span class="hljs-comment">// 2. 安裝與環境</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<h2>安裝與環境</h2>"</span></span><span>;
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"<p>確保PHP安裝了GD庫，可以通過 <code>phpinfo()

// 獲取圖像尺寸
\$width = imagesx(\$img);
\$height = imagesy(\$img);
echo \"圖像寬度: \$width, 高度: \$height\\n\";

\$newImg = imagecreatetruecolor(\$width, \$height);

imagecopy(\$newImg, \$img, 0, 0, 0, 0, \$width, \$height);

// 繪製矩形
\$red = imagecolorallocate(\$newImg, 255, 0, 0);
imagerectangle(\$newImg, 10, 10, 50, 50, \$red);

// 保存為PNG
imagepng(\$newImg, 'output.png');

// 釋放資源
imagedestroy(\$img);
imagedestroy(\$newImg);