php图像处理函数大全(缩放、剪裁、缩放、翻转、旋转、透明、锐化的实例总结)_PHP教程
imagephp一函數創建剪裁影像處理圖片資源大全實例總結旋轉的縮放翻轉透明銳化
一、创建图片资源
imagecreatetruecolor(width,height);
imagecreatefromgif(图片名称);
imagecreatefrompng(图片名称);
imagecreatefromjpeg(图片名称);画出各种图像 imagegif(图片资源,保存路径);
imagepng()
imagejpeg();
二、获取图片属性
imagesx(res//宽度
imagesy(res//高度
getimagesize(文件路径)
返回一个具有四个单元的数组。索引 0 包含图像宽度的像素值，索引 1 包含图像高度的像素值。索引 2 是图像类型的标记：1 = GIF，2 = JPG，3 = PNG，4 = SWF，5 = PSD，6 = BMP，7 = TIFF(intel byte order)，8 = TIFF(motorola byte order)，9 = JPC，10 = JP2，11 = JPX，12 = JB2，13 = SWC，14 = IFF，15 = WBMP，16 = XBM。这些标记与 PHP 4.3.0 新加的 IMAGETYPE 常量对应。索引 3 是文本字符串，内容为“height="yyy" width="xxx"”，可直接用于 IMG 标记。
销毁图像资源
imagedestroy(图片资源);
三、透明处理
PNG、jpeg透明色都正常，只有gif不正常
imagecolortransparent(resource image [,int color])//将某个颜色设置成透明色
imagecolorstotal()
imagecolorforindex();
四、图片的裁剪
imagecopyresized()
imagecopyresampled();
五、加水印（文字、图片）
字符串编码转换string iconv ( string $in_charset , string $out_charset , string $str )
六、图片旋转
imagerotate();//制定角度的图片翻转
七、图片的翻转
沿X轴 沿Y轴翻转
八、锐化
imagecolorsforindex()
imagecolorat()
在图片上画图形 $img=imagecreatefromgif("./images/map.gif");
<span 1</span> <?<span PHP
</span><span 2</span> <span /*</span><span *
</span><span 3</span> <span * 图片锐化处理
</span><span 4</span> <span * edit by www.jbxue.com
</span><span 5</span> <span */</span>
<span 6</span> <span $red</span>= imagecolorallocate(<span $img</span>, 255, 0, 0<span );
</span><span 7</span>
<span 8</span> imageline(<span $img</span>, 0, 0, 100, 100, <span $red</span><span );
</span><span 9</span> imageellipse(<span $img</span>, 200, 100, 100, 100, <span $red</span><span );
</span><span 10</span> imagegif(<span $img</span>, "./images/map2.gif"<span );
</span><span 11</span> imagedestroy(<span $img</span><span );
</span><span 12</span> <span 图片普通缩放
</span><span 13</span> 复制代码 代码如下:
<span 14</span>
<span 15</span> <span $filename</span>="./images/hee.jpg"<span ;
</span><span 16</span> <span $per</span>=0.3<span ;
</span><span 17</span> <span list</span>(<span $width</span>, <span $height</span>)=<span getimagesize</span>(<span $filename</span><span );
</span><span 18</span> <span $n_w</span>=<span $width</span>*<span $per</span><span ;
</span><span 19</span> <span $n_h</span>=<span $width</span>*<span $per</span><span ;
</span><span 20</span> <span $new</span>=imagecreatetruecolor(<span $n_w</span>, <span $n_h</span><span );
</span><span 21</span> <span $img</span>=imagecreatefromjpeg(<span $filename</span><span );
</span><span 22</span> <span //</span><span 拷贝部分图像并调整</span>
<span 23</span> imagecopyresized(<span $new</span>, <span $img</span>,0, 0,0, 0,<span $n_w</span>, <span $n_h</span>, <span $width</span>, <span $height</span><span );
</span><span 24</span> <span //</span><span 图像输出新图片、另存为</span>
<span 25</span> imagejpeg(<span $new</span>, "./images/hee2.jpg"<span );
</span><span 26</span> imagedestroy(<span $new</span><span );
</span><span 27</span> imagedestroy(<span $img</span><span );
</span><span 28</span>
<span 29</span> <span 图片等比例缩放、没处理透明色
</span><span 30</span> 复制代码 代码如下:
<span 31</span>
<span 32</span> <span function</span> thumn(<span $background</span>, <span $width</span>, <span $height</span>, <span $newfile</span><span ) {
</span><span 33</span> <span list</span>(<span $s_w</span>, <span $s_h</span>)=<span getimagesize</span>(<span $background</span>);<span //</span><span 获取原图片高度、宽度</span>
<span 34</span> <span if</span> (<span $width</span> && (<span $s_w</span> < <span $s_h</span><span )) {
</span><span 35</span> <span $width</span> = (<span $height</span> / <span $s_h</span>) * <span $s_w</span><span ;
</span><span 36</span> } <span else</span><span {
</span><span 37</span> <span $height</span> = (<span $width</span> / <span $s_w</span>) * <span $s_h</span><span ;
</span><span 38</span> <span }
</span><span 39</span> <span $new</span>=imagecreatetruecolor(<span $width</span>, <span $height</span><span );
</span><span 40</span> <span $img</span>=imagecreatefromjpeg(<span $background</span><span );
</span><span 41</span> imagecopyresampled(<span $new</span>, <span $img</span>, 0, 0, 0, 0, <span $width</span>, <span $height</span>, <span $s_w</span>, <span $s_h</span><span );
</span><span 42</span> imagejpeg(<span $new</span>, <span $newfile</span><span );
</span><span 43</span> imagedestroy(<span $new</span><span );
</span><span 44</span> imagedestroy(<span $img</span><span );
</span><span 45</span> <span }
</span><span 46</span> thumn("images/hee.jpg", 200, 200, "./images/hee3.jpg"<span );
</span><span 47</span>
<span 48</span> <span gif透明色处理
</span><span 49</span> 复制代码 代码如下:
<span 50</span>
<span 51</span> <span function</span> thumn(<span $background</span>, <span $width</span>, <span $height</span>, <span $newfile</span><span ) {
</span><span 52</span> <span list</span>(<span $s_w</span>, <span $s_h</span>)=<span getimagesize</span>(<span $background</span><span );
</span><span 53</span> <span if</span> (<span $width</span> && (<span $s_w</span> < <span $s_h</span><span )) {
</span><span 54</span> <span $width</span> = (<span $height</span> / <span $s_h</span>) * <span $s_w</span><span ;
</span><span 55</span> } <span else</span><span {
</span><span 56</span> <span $height</span> = (<span $width</span> / <span $s_w</span>) * <span $s_h</span><span ;
</span><span 57</span> <span }
</span><span 58</span> <span $new</span>=imagecreatetruecolor(<span $width</span>, <span $height</span><span );
</span><span 59</span> <span $img</span>=imagecreatefromgif(<span $background</span><span );
</span><span 60</span> <span $otsc</span>=imagecolortransparent(<span $img</span><span );
</span><span 61</span> <span if</span>(<span $otsc</span> >=0 && <span $otst</span> < imagecolorstotal(<span $img</span>)){<span //</span><span 判断索引色</span>
<span 62</span> <span $tran</span>=imagecolorsforindex(<span $img</span>, <span $otsc</span>);<span //</span><span 索引颜色值</span>
<span 63</span> <span $newt</span>=imagecolorallocate(<span $new</span>, <span $tran</span>["red"], <span $tran</span>["green"], <span $tran</span>["blue"<span ]);
</span><span 64</span> imagefill(<span $new</span>, 0, 0, <span $newt</span><span );
</span><span 65</span> imagecolortransparent(<span $new</span>, <span $newt</span><span );
</span><span 66</span> <span }
</span><span 67</span> imagecopyresized(<span $new</span>, <span $img</span>, 0, 0, 0, 0, <span $width</span>, <span $height</span>, <span $s_w</span>, <span $s_h</span><span );
</span><span 68</span> imagegif(<span $new</span>, <span $newfile</span><span );
</span><span 69</span> imagedestroy(<span $new</span><span );
</span><span 70</span> imagedestroy(<span $img</span><span );
</span><span 71</span> <span }
</span><span 72</span> thumn("images/map.gif", 200, 200, "./images/map3.gif");
<?<span php
</span><span /*</span><span *
* 图片裁剪处理
* edit by www.jbxue.com
</span><span */</span>
<span function</span> cut(<span $background</span>, <span $cut_x</span>, <span $cut_y</span>, <span $cut_width</span>, <span $cut_height</span>, <span $location</span><span ){
</span><span $back</span>=imagecreatefromjpeg(<span $background</span><span );
</span><span $new</span>=imagecreatetruecolor(<span $cut_width</span>, <span $cut_height</span><span );
imagecopyresampled(</span><span $new</span>, <span $back</span>, 0, 0, <span $cut_x</span>, <span $cut_y</span>, <span $cut_width</span>, <span $cut_height</span>,<span $cut_width</span>,<span $cut_height</span><span );
imagejpeg(</span><span $new</span>, <span $location</span><span );
imagedestroy(</span><span $new</span><span );
imagedestroy(</span><span $back</span><span );
}
cut(</span>"./images/hee.jpg", 440, 140, 117, 112, "./images/hee5.jpg"<span );
</span>?>
文字水印
<span 1</span> <?<span PHP
</span><span 2</span> <span /*</span><span *
</span><span 3</span> <span *
</span><span 4</span> <span * 图片添加文字水印
</span><span 5</span> <span */</span>
<span 6</span>
<span 7</span> <span function</span> mark_text(<span $background</span>, <span $text</span>, <span $x</span>, <span $y</span><span ){
</span><span 8</span> <span $back</span>=imagecreatefromjpeg(<span $background</span><span );
</span><span 9</span> <span $color</span>=imagecolorallocate(<span $back</span>, 0, 255, 0<span );
</span><span 10</span> imagettftext(<span $back</span>, 20, 0, <span $x</span>, <span $y</span>, <span $color</span>, "simkai.ttf", <span $text</span><span );
</span><span 11</span> imagejpeg(<span $back</span>, "./images/hee7.jpg"<span );
</span><span 12</span> imagedestroy(<span $back</span><span );
</span><span 13</span> <span }
</span><span 14</span> mark_text("./images/hee.jpg", "细说PHP", 150, 250<span );
</span><span 15</span> <span //</span><span 图片水印</span>
<span 16</span> <span function</span> mark_pic(<span $background</span>, <span $waterpic</span>, <span $x</span>, <span $y</span><span ){
</span><span 17</span> <span $back</span>=imagecreatefromjpeg(<span $background</span><span );
</span><span 18</span> <span $water</span>=imagecreatefromgif(<span $waterpic</span><span );
</span><span 19</span> <span $w_w</span>=imagesx(<span $water</span><span );
</span><span 20</span> <span $w_h</span>=imagesy(<span $water</span><span );
</span><span 21</span> imagecopy(<span $back</span>, <span $water</span>, <span $x</span>, <span $y</span>, 0, 0, <span $w_w</span>, <span $w_h</span><span );
</span><span 22</span> imagejpeg(<span $back</span>,"./images/hee8.jpg"<span );
</span><span 23</span> imagedestroy(<span $back</span><span );
</span><span 24</span> imagedestroy(<span $water</span><span );
</span><span 25</span> <span }
</span><span 26</span> mark_pic("./images/hee.jpg", "./images/gaolf.gif", 50, 200);
图片旋转
<span 1</span> <?<span PHP
</span><span 2</span> <span /*</span><span *
</span><span 3</span> <span * 图片旋转
</span><span 4</span> <span * edit by www.jbxue.com
</span><span 5</span> <span */</span>
<span 6</span> <span $back</span>=imagecreatefromjpeg("./images/hee.jpg"<span );
</span><span 7</span>
<span 8</span> <span $new</span>=imagerotate(<span $back</span>, 45, 0<span );
</span><span 9</span> imagejpeg(<span $new</span>, "./images/hee9.jpg"<span );
</span><span 10</span> ?>
<span 1</span> <?<span php
</span><span 2</span> <span /*</span><span *
</span><span 3</span> <span * 图片水平翻转 垂直翻转
</span><span 4</span> <span * edit by www.jbxue.com
</span><span 5</span> <span */</span>
<span 6</span> <span function</span> turn_y(<span $background</span>, <span $newfile</span><span ){
</span><span 7</span>
<span 8</span> <span $back</span>=imagecreatefromjpeg(<span $background</span><span );
</span><span 9</span> <span $width</span>=imagesx(<span $back</span><span );
</span><span 10</span> <span $height</span>=imagesy(<span $back</span><span );
</span><span 11</span> <span $new</span>=imagecreatetruecolor(<span $width</span>, <span $height</span><span );
</span><span 12</span> <span for</span>(<span $x</span>=0; <span $x</span> < <span $width</span>; <span $x</span>++<span ){
</span><span 13</span> imagecopy(<span $new</span>, <span $back</span>, <span $width</span>-<span $x</span>-1, 0, <span $x</span>, 0, 1, <span $height</span><span );
</span><span 14</span> <span }
</span><span 15</span> imagejpeg(<span $new</span>, <span $newfile</span><span );
</span><span 16</span> imagedestroy(<span $back</span><span );
</span><span 17</span> imagedestroy(<span $new</span><span );
</span><span 18</span> <span }
</span><span 19</span> <span function</span> turn_x(<span $background</span>, <span $newfile</span><span ){
</span><span 20</span> <span $back</span>=imagecreatefromjpeg(<span $background</span><span );
</span><span 21</span> <span $width</span>=imagesx(<span $back</span><span );
</span><span 22</span> <span $height</span>=imagesy(<span $back</span><span );
</span><span 23</span> <span $new</span>=imagecreatetruecolor(<span $width</span>, <span $height</span><span );
</span><span 24</span> <span for</span>(<span $y</span>=0; <span $y</span> < <span $height</span>; <span $y</span>++<span ){
</span><span 25</span> imagecopy(<span $new</span>, <span $back</span>,0, <span $height</span>-<span $y</span>-1, 0, <span $y</span>, <span $width</span>, 1<span );
</span><span 26</span> <span }
</span><span 27</span> imagejpeg(<span $new</span>, <span $newfile</span><span );
</span><span 28</span> imagedestroy(<span $back</span><span );
</span><span 29</span> imagedestroy(<span $new</span><span );
</span><span 30</span> <span }
</span><span 31</span> turn_y("./images/hee.jpg", "./images/hee11.jpg"<span );
</span><span 32</span> turn_x("./images/hee.jpg", "./images/hee12.jpg"<span );
</span><span 33</span> ?>
陳述
本文內容由網友自願投稿，版權歸原作者所有。本站不承擔相應的法律責任。如發現涉嫌抄襲或侵權的內容，請聯絡admin@php.cn
超越炒作：評估當今PHP的角色Apr 12, 2025 am 12:17 AMPHP在現代編程中仍然是一個強大且廣泛使用的工具，尤其在web開發領域。 1)PHP易用且與數據庫集成無縫，是許多開發者的首選。 2)它支持動態內容生成和麵向對象編程，適合快速創建和維護網站。 3)PHP的性能可以通過緩存和優化數據庫查詢來提升，其廣泛的社區和豐富生態系統使其在當今技術棧中仍具重要地位。
PHP中的弱參考是什麼？什麼時候有用？Apr 12, 2025 am 12:13 AM在PHP中，弱引用是通過WeakReference類實現的，不會阻止垃圾回收器回收對象。弱引用適用於緩存系統和事件監聽器等場景，需注意其不能保證對象存活，且垃圾回收可能延遲。
解釋PHP中的__ Invoke Magic方法。Apr 12, 2025 am 12:07 AM\_\_invoke方法允許對象像函數一樣被調用。 1.定義\_\_invoke方法使對象可被調用。 2.使用$obj(...)語法時，PHP會執行\_\_invoke方法。 3.適用於日誌記錄和計算器等場景，提高代碼靈活性和可讀性。
解釋PHP 8.1中的纖維以進行並發。Apr 12, 2025 am 12:05 AMFibers在PHP8.1中引入，提升了並發處理能力。 1)Fibers是一種輕量級的並發模型，類似於協程。 2)它們允許開發者手動控制任務的執行流，適合處理I/O密集型任務。 3)使用Fibers可以編寫更高效、響應性更強的代碼。
PHP社區：資源，支持和發展Apr 12, 2025 am 12:04 AMPHP社區提供了豐富的資源和支持，幫助開發者成長。 1)資源包括官方文檔、教程、博客和開源項目如Laravel和Symfony。 2)支持可以通過StackOverflow、Reddit和Slack頻道獲得。 3)開發動態可以通過關注RFC了解。 4)融入社區可以通過積極參與、貢獻代碼和學習分享來實現。
PHP與Python：了解差異Apr 11, 2025 am 12:15 AMPHP和Python各有優勢，選擇應基於項目需求。 1.PHP適合web開發，語法簡單，執行效率高。 2.Python適用於數據科學和機器學習，語法簡潔，庫豐富。
php：死亡還是簡單地適應？Apr 11, 2025 am 12:13 AMPHP不是在消亡，而是在不斷適應和進化。 1)PHP從1994年起經歷多次版本迭代，適應新技術趨勢。 2)目前廣泛應用於電子商務、內容管理系統等領域。 3)PHP8引入JIT編譯器等功能，提升性能和現代化。 4)使用OPcache和遵循PSR-12標準可優化性能和代碼質量。
PHP的未來：改編和創新Apr 11, 2025 am 12:01 AMPHP的未來將通過適應新技術趨勢和引入創新特性來實現：1)適應云計算、容器化和微服務架構，支持Docker和Kubernetes；2)引入JIT編譯器和枚舉類型，提升性能和數據處理效率；3)持續優化性能和推廣最佳實踐。
熱AI工具
Undresser.AI Undress
人工智慧驅動的應用程序，用於創建逼真的裸體照片
AI Clothes Remover
用於從照片中去除衣服的線上人工智慧工具。
Undress AI Tool
免費脫衣圖片
Clothoff.io
AI脫衣器
AI Hentai Generator
免費產生 AI 無盡。
熱門文章
R.E.P.O.能量晶體解釋及其做什麼（黃色晶體）
3 週前By尊渡假赌尊渡假赌尊渡假赌
R.E.P.O.最佳圖形設置
3 週前By尊渡假赌尊渡假赌尊渡假赌
刺客信條陰影：貝殼謎語解決方案
2 週前ByDDD
R.E.P.O.如果您聽不到任何人，如何修復音頻
3 週前By尊渡假赌尊渡假赌尊渡假赌
WWE 2K25：如何解鎖Myrise中的所有內容
3 週前By尊渡假赌尊渡假赌尊渡假赌
熱工具
SecLists
SecLists是最終安全測試人員的伙伴。它是一個包含各種類型清單的集合，這些清單在安全評估過程中經常使用，而且都在一個地方。 SecLists透過方便地提供安全測試人員可能需要的所有列表，幫助提高安全測試的效率和生產力。清單類型包括使用者名稱、密碼、URL、模糊測試有效載荷、敏感資料模式、Web shell等等。測試人員只需將此儲存庫拉到新的測試機上，他就可以存取所需的每種類型的清單。
SublimeText3 Mac版
神級程式碼編輯軟體(SublimeText3)
EditPlus 中文破解版
體積小，語法高亮，不支援程式碼提示功能
記事本++7.3.1
好用且免費的程式碼編輯器
VSCode Windows 64位元 下載
微軟推出的免費、功能強大的一款IDE編輯器
