Complete collection of PHP image processing functions (summary of examples of scaling, cropping, zooming, flipping, rotating, transparency, and sharpening)

Complete collection of PHP image processing functions (summary of examples of scaling, cropping, zooming, flipping, rotating, transparency, and sharpening)_PHP Tutorial

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Jul 20, 2016 am 11:12 AM

imagephponefunctioncreatetailoringImage ProcessingPicture resourcesEncyclopediaExampleSummarizerotateofZoomfliptransparentsharpen

1. Create image resources
imagecreatetruecolor(width,height);
imagecreatefromgif(picture name);
imagecreatefrompng(picture name);
imagecreatefromjpeg(picture name); draw various images imagegif (image resource, save path);
imagepng()
imagejpeg();

2. Get image attributes
imagesx(res//width
imagesy(res// height
getimagesize(filepath)
returns an array with four cells. Index 0 contains the pixel value of the image width, index 1 contains the pixel value of the image height, and index 2 is the tag of the image type: 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. These tags correspond to the new IMAGETYPE constant added in PHP 4.3.0. Index 3 is a text string with the content "height="yyy". width="xxx"" can be used directly for IMG tags.
Destroy image resources
imagedestroy (picture resources);

3. Transparency processing
PNG and jpeg transparent colors are normal. Only gif is abnormal
imagecolortransparent(resource image [,int color])//Set a certain color to a transparent color
imagecolorstotal()
imagecolorforindex();

4. Picture Cropping
imagecopyresized()
imagecopyresampled();

5. Add watermark (text, picture)
String encoding conversion string iconv ( string $in_charset , string $out_charset , string $str )

6. Image rotation
imagerotate(); // Image flip at a specified angle

7. Image flip
Flip along the X axis and Y axis

8. Sharpen
imagecolorsforindex()
imagecolorat()
Draw graphics on the picture $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>?>

Text watermark

<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);

Picture Rotation

<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> ?>

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

The Continued Use of PHP: Reasons for Its EnduranceApr 19, 2025 am 12:23 AM

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python: Exploring Their Similarities and DifferencesApr 19, 2025 am 12:21 AM

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP and Python: Different Paradigms ExplainedApr 18, 2025 am 12:26 AM

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP and Python: A Deep Dive into Their HistoryApr 18, 2025 am 12:25 AM

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

Choosing Between PHP and Python: A GuideApr 18, 2025 am 12:24 AM

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP and Frameworks: Modernizing the LanguageApr 18, 2025 am 12:14 AM

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHP's Impact: Web Development and BeyondApr 18, 2025 am 12:10 AM

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

How does PHP type hinting work, including scalar types, return types, union types, and nullable types?Apr 17, 2025 am 12:25 AM

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

See all articles