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)
Jun 13, 2016 am 11:28 AM
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 $new</span><span );
</span><span 30</span> <span }
</span><span 31</span> turn_y("./images/hee.jpg", "./images/hee11.jpg"<span );
</span><span 32</span> turn_x("./images/hee.jpg", "./images/hee12.jpg"<span );
</span><span 33</span> ?>
陳述
本文內容由網友自願投稿，版權歸原作者所有。本站不承擔相應的法律責任。如發現涉嫌抄襲或侵權的內容，請聯絡admin@php.cn
php怎么把负数转为正整数Apr 19, 2022 pm 08:59 PMphp把负数转为正整数的方法：1、使用abs()函数将负数转为正数，使用intval()函数对正数取整，转为正整数，语法“intval(abs($number))”；2、利用“~”位运算符将负数取反加一，语法“~$number + 1”。
php怎么实现几秒后执行一个函数Apr 24, 2022 pm 01:12 PM实现方法：1、使用“sleep(延迟秒数)”语句，可延迟执行函数若干秒；2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句，可延迟执行函数若干秒和纳秒；3、使用“time_sleep_until(time()+7)”语句。
php怎么除以100保留两位小数Apr 22, 2022 pm 06:23 PMphp除以100保留两位小数的方法：1、利用“/”运算符进行除法运算，语法“数值 / 100”；2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值，并保留两位小数。
php怎么根据年月日判断是一年的第几天Apr 22, 2022 pm 05:02 PM判断方法：1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式；2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的，因此真实天数需要在此基础上加1。
php怎么替换nbsp空格符Apr 24, 2022 pm 02:55 PM方法：1、用“str_replace(" ","其他字符",$str)”语句，可将nbsp符替换为其他字符；2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。
php怎么判断有没有小数点Apr 20, 2022 pm 08:12 PMphp判断有没有小数点的方法：1、使用“strpos(数字字符串,'.')”语法，如果返回小数点在字符串中第一次出现的位置，则有小数点；2、使用“strrpos(数字字符串,'.')”语句，如果返回小数点在字符串中最后一次出现的位置，则有。
php字符串有没有下标Apr 24, 2022 am 11:49 AMphp字符串有下标。在PHP中，下标不仅可以应用于数组和对象，还可应用于字符串，利用字符串的下标和中括号“[]”可以访问指定索引位置的字符，并对该字符进行读写，语法“字符串名[下标值]”；字符串的下标值（索引值）只能是整数类型，起始值为0。
php怎么读取字符串后几个字符Apr 22, 2022 pm 08:31 PM在php中，可以使用substr()函数来读取字符串后几个字符，只需要将该函数的第二个参数设置为负值，第三个参数省略即可；语法为“substr(字符串,-n)”，表示读取从字符串结尾处向前数第n个字符开始，直到字符串结尾的全部字符。
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）
2 週前By尊渡假赌尊渡假赌尊渡假赌
倉庫：如何復興隊友
4 週前By尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island冒險：如何獲得巨型種子
4 週前By尊渡假赌尊渡假赌尊渡假赌
擊敗分裂小說需要多長時間？
3 週前ByDDD
R.E.P.O.保存文件位置：在哪里以及如何保護它？
3 週前ByDDD
熱工具
SublimeText3 Mac版
神級程式碼編輯軟體(SublimeText3)
mPDF
mPDF是一個PHP庫，可以從UTF-8編碼的HTML產生PDF檔案。原作者Ian Back編寫mPDF以從他的網站上「即時」輸出PDF文件，並處理不同的語言。與原始腳本如HTML2FPDF相比，它的速度較慢，並且在使用Unicode字體時產生的檔案較大，但支援CSS樣式等，並進行了大量增強。支援幾乎所有語言，包括RTL（阿拉伯語和希伯來語）和CJK（中日韓）。支援嵌套的區塊級元素（如P、DIV），
SublimeText3漢化版
中文版，非常好用
EditPlus 中文破解版
體積小，語法高亮，不支援程式碼提示功能
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
