Home > Tutorials > PHP Tutorials

PHP image processing function Instance Daquan and PHP verification code

Source: Internet
Author: User
Tags imagecopy imagejpeg mathematical functions shuffle
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

    3. Prepare the canvas

    4. $im = Imagecreatetruecolor (500, 300);

    5. Preparing Paint

    6. $black = imagecolorallocate ($im, 0, 0, 0);

    7. $white = Imagecolorallocate ($im, 255, 255, 255);

    8. Background filled with black

    9. Imagefill ($im, 0,0, $black);

    10. Draw a rectangle, fill it with white

    11. Imagefilledellipse ($im, 258, 151, $white);
    12. Output to a browser or save.
    13. Header ("Content-type:image/png");
    14. Output picture
    15. Imagepng ($im);

    16. Close Canvas

    17. Imagedestroy ($im);
    18. ?>

Copy Code

PHP image processing function 1, math function 2, image processing function

Mathematical functions: 1,max (); 2,min (); 3,mt_rand (); randomly taking a number

    2. Echomt_rand (1,5);
    3. ?>
Copy Code

Mt_rand randomly take a value

    3. Randomly take a value from an array

    4. $arr = Array ("A", "B", "C", "D", "E");

    5. $rkey = Mt_rand (0,count ($arr)-1);

    6. echo $arr [$rkey];

    7. ?>

Copy Code

4.ceil (); ceiling 5.floor (); 6.round (); rounding

    3. echo ceil (2.4);//3

    4. echo Floor (2.4);//2
    5. Echo round (2.4);//2
    6. Echo round (2.6);//3

    7. ?>

Copy Code

6.pi (); Pi take pi

    2. Echo (pi ());
    3. Echo M_pi;
    4. ?>
Copy Code

Picture processing functions use scenario 1. Verification Code 2. Scaling 3. Cropping 4. Watermark

Five steps to wear an image in PHP 1. Prepare the Canvas 2. Prepare Paint 3. Draw an image or text on the canvas 4. Output final image or Cao Cun final image 5. Release Canvas Resources

Example:

    3. 1. Preparing the canvas

    4. $im = Imagecreatetruecolor (500,300);
    5. 2. Preparing the Paint
    6. $black = imagecolorallocate ($im, 0, 0, 0);
    7. $white = Imagecolorallocate ($im, 255, 255, 255);

    8. 3. Draw an image or text on the canvas

    9. If the background is not populated, the default is black
    10. Imageellipse ($im, 258,151,200,200, $white);

    11. 4. Output the final image or save the final image

    12. Header ("Content-type:image/png");
    13. Imagepng ($im);
    14. 5. Releasing Canvas resources
    15. Imagedestroy ($im);
    16. ?>

Copy Code

Draw Image: Imagefill (); Imagesetpixel ();//Portrait Point Imageline ();//Draw line Imagerectangle ();//Draw a rectangle Imagepolygon ();// Draw a polygon imageellipse ();//Draw an ellipse imageare (); Draw an arc Imagechar ();//horizontal Draw a character imagestring ();//horizontal draw a line of string

Example:

    3. Draw Line

    4. 1. Preparing the canvas
    5. $im = Imagecreatetruecolor (500,300);
    6. 2. Preparing the Paint
    7. $black = imagecolorallocate ($im, 0, 0, 0);
    8. $white = Imagecolorallocate ($im, 255, 255, 255);

    9. 3. Draw an image or text on the canvas

    10. If the background is not populated, the default is black
    11. Imageline ($im, 0,0,500,300, $white);
    12. Imageline ($im, 0,300,500,0, $white);
    13. Imageline ($im, 0,150,500,150, $white);
    14. Imageline ($im, 250,0,250,300, $white);

    15. 4. Output the final image or save the final image

    16. Header ("Content-type:image/png");
    17. Imagepng ($im);
    18. 5. Releasing Canvas resources
    19. Imagedestroy ($im);
    20. ?>

Copy Code

Example:

    3. Add interferon

    4. 1. Preparing the canvas
    5. $im = Imagecreatetruecolor (500,300);
    6. 2. Preparing the Paint
    7. $black = imagecolorallocate ($im, 0, 0, 0);
    8. $white = Imagecolorallocate ($im, 255, 255, 255);

    9. 3. Draw an image or text on the canvas

    10. Generate a random point
    11. for ($i =0; $i < $i + +) {

    12. Imagesetpixel ($im, Mt_rand (0,500), Mt_rand (0,300), $white);

    13. }

    14. Generate a random line

    15. for ($j =0; $j < $j + +) {

    16. Imageline ($im, Mt_rand (0,500), Mt_rand (0,300), Mt_rand (0,500), Mt_rand (0,300), $white);
    17. }//4. outputting the final image or saving the final image
    18. Header ("Content-type:image/png");
    19. Imagepng ($im);
    20. 5. Releasing Canvas resources
    21. Imagedestroy ($im);
    22. ?>

Copy Code

Example:

    3. Draw a rectangle:

    4. 1. Preparing the canvas
    5. $im = Imagecreatetruecolor (500,300);
    6. 2. Preparing the Paint
    7. $black = imagecolorallocate ($im, 0, 0, 0);
    8. $white = Imagecolorallocate ($im, 255, 255, 255);

    9. 3. Draw an image or text on the canvas

    10. Imagerectangle ($im, 480, 280, $white);//
    11. Imagefilledrectangle ($im, 480, 280, $white);//Fill

    12. 4. Output the final image or save the final image

    13. Header ("Content-type:image/png");
    14. Imagepng ($im);
    15. 5. Releasing Canvas resources
    16. Imagedestroy ($im);
    17. ?>

Copy Code

Example:

    3. Imagepolygon Draw Polygon _ Draw Triangle

    4. 1. Preparing the canvas
    5. $im = Imagecreatetruecolor (500,300);
    6. 2. Preparing the Paint
    7. $black = imagecolorallocate ($im, 0, 0, 0);
    8. $white = Imagecolorallocate ($im, 255, 255, 255);

    9. 3. Draw an image or text on the canvas

    10. $arr = Array (
    11. 250,20,
    12. 60,240,
    13. 440,240
    14. );
    15. Imagepolygon ($im, $arr, 3, $white);

    16. 4. Output the final image or save the final image

    17. Header ("Content-type:image/png");
    18. Imagepng ($im);
    19. 5. Releasing Canvas resources
    20. Imagedestroy ($im);
    21. ?>

Copy Code

example, draw a 3D pie chart

  6. 1. Preparing the canvas

  8. $im = Imagecreatetruecolor (500,300);
  10. 2. Preparing the Paint
  12. $black = imagecolorallocate ($im, 0, 0, 0);
  14. $red = Imagecolorallocate ($im, 255, 0, 0);
  16. $grayred = Imagecolorallocate ($im, 255, 100, 100);
  18. $green = imagecolorallocate ($im, 0, 255, 0);
  20. $blue = imagecolorallocate ($im, 0, 0, 255);
  22. $gray = Imagecolorallocate ($im, 200, 200, 200);
  24. $white = Imagecolorallocate ($im, 255, 255, 255);

  26. 3. Draw an image or text on the canvas

  28. for ($i =0; $i < $i + +) {
  30. Imagefilledarc ($im, $i, 150+, 0, $gray, Img_arc_pie);
  32. Imagefilledarc ($im, $i, 150+, $grayred, Img_arc_pie);
  34. Imagefilledarc ($im, $i, 150+, $green, Img_arc_pie);
  36. Imagefilledarc ($im, $i, 150+, $blue, Img_arc_pie);

  38. }

  40. Imagefilledarc ($im, $, 0, $white, Img_arc_pie);
  42. Imagefilledarc ($im,,,,,,,,, $red, Img_arc_pie);
  44. Imagefilledarc ($im,,,,,,,, $green, Img_arc_pie);
  46. Imagefilledarc ($im,,,,,,,, $blue, Img_arc_pie);

  48. 4. Output the final image or save the final image

  50. Header ("Content-type:image/png");
  52. Imagepng ($im);
  54. 5. Releasing Canvas resources
  56. Imagedestroy ($im);
  58. ?>

Copy Code

Example:

    3. Write text:

    4. 1. Preparing the canvas
    5. $im = Imagecreatetruecolor (500,300);
    6. 2. Preparing the Paint
    7. $black = imagecolorallocate ($im, 0, 0, 0);
    8. $red = Imagecolorallocate ($im, 255, 0, 0);
    9. $grayred = Imagecolorallocate ($im, 255, 100, 100);
    10. $green = imagecolorallocate ($im, 0, 255, 0);
    11. $blue = imagecolorallocate ($im, 0, 0, 255);
    12. $gray = Imagecolorallocate ($im, 200, 200, 200);
    13. $white = Imagecolorallocate ($im, 255, 255, 255);

    14. 3. Draw an image or text on the canvas

    15. $str = "PHP is very much";

    16. Imagestring ($im, 5, 260, $STR, $green);

    17. 4. Output the final image or save the final image
    18. Header ("Content-type:image/png");
    19. Imagepng ($im);
    20. 5. Releasing Canvas resources
    21. Imagedestroy ($im);
    22. ?>

Copy Code

Example:

    3. Write a single character:

    4. 1. Preparing the canvas
    5. $im = Imagecreatetruecolor (500,300);
    6. 2. Preparing the Paint
    7. $black = imagecolorallocate ($im, 0, 0, 0);
    8. $red = Imagecolorallocate ($im, 255, 0, 0);
    9. $grayred = Imagecolorallocate ($im, 255, 100, 100);
    10. $green = imagecolorallocate ($im, 0, 255, 0);
    11. $blue = imagecolorallocate ($im, 0, 0, 255);
    12. $gray = Imagecolorallocate ($im, 200, 200, 200);
    13. $white = Imagecolorallocate ($im, 255, 255, 255);

    14. 3. Draw an image or text on the canvas

    15. $str = "P";

    16. Imagechar ($im, 5, 260, $STR, $green);

    17. 4. Output the final image or save the final image
    18. Header ("Content-type:image/png");
    19. Imagepng ($im);
    20. 5. Releasing Canvas resources
    21. Imagedestroy ($im);
    22. ?>

Copy Code

Example

  6. Write on a picture

  8. 1. Preparing the canvas
  10. $im = Imagecreatetruecolor (500,300);
  12. 2. Preparing the Paint
  14. $black = imagecolorallocate ($im, 0, 0, 0);
  16. $red = Imagecolorallocate ($im, 255, 0, 0);
  18. $grayred = Imagecolorallocate ($im, 255, 100, 100);
  20. $green = imagecolorallocate ($im, 0, 255, 0);
  22. $blue = imagecolorallocate ($im, 0, 0, 255);
  24. $gray = Imagecolorallocate ($im, 200, 200, 200);
  26. $white = Imagecolorallocate ($im, 255, 255, 255);

  28. 3. Draw an image or text on the canvas

  30. $str = "JUNZAIVIP";

  32. $file = "e:/php/fonts/simyou. TTF ";
  34. $file = "fonts/simyou. TTF ";

  36. Imagettftext ($im, 0, $green, $file, $STR);

  38. 4. Output the final image or save the final image

  40. Header ("Content-type:image/png");
  42. Imagepng ($im);
  44. 5. Releasing Canvas resources
  46. Imagedestroy ($im);
  48. ?>

Copy Code

Design of PHP Verification code

  6. Prepare the canvas

  8. $im = Imagecreatetruecolor (100,50);
  10. Preparing Paint
  12. $black = imagecolorallocate ($im, 0, 0, 0);
  14. $gray = Imagecolorallocate ($im, 200, 200, 200);

  16. Fill background

  18. Imagefill ($im, 0, 0, $gray);

  20. Text coordinates

  22. $x = (100-4*20)/2 + 6;
  24. $y = (50-20)/2 + 20;

  26. Draw an image or text on the canvas

  28. Connect the three arrays.

  30. $strarr = Array_merge (range (1, 9), range (A, z), range (A, z));

  32. Scrambled Array

  34. Shuffle ($strarr);

  36. Array_slice: Take the first few of the array

  38. Join converts an array into a string and breaks it with the first variable
  40. $str = Join ("', Array_slice ($strarr, 0,4));

  42. $file = "E:/php/fonts/msyh.ttf";

  44. $file = "Fonts/msyh.ttf";

  46. Imagettftext ($im, 0, $x, $y, $black, $file, $STR);

  48. Output final image or save final image

  50. Header ("Content-type:image/png");
  52. Imagepng ($im);
  54. Releasing Canvas resources
  56. Imagedestroy ($im);
  58. ?>

Copy Code

PHP captcha Design: There are two pages involved: index.php & reg.php Description:

This verification code version only implements the verification image of the dynamic access to the foreground registration page verification code and generate a picture of the verification code to compare the verification code is made up of digital lowercase capital letters randomly

index.php//to implement user registration

    5. Reg

    9. User Registration page

Copy Code

reg.php//to verify that the verification code is correct

    3. Session_Start ();

    4. echo $_post[' username '];
    5. echo $_post[' password '];
    6. $code = Strtolower ($_post[' Vcode ');

    7. Echo $code;

    8. echo "

      ";  
    9. Print_r ($_session);  
    10. echo "
      11. ";
    11. $vstr = Strtolower ($_session[' vstr ');

    12. if ($code = = $vstr) {

    13. Implement a page jump
    14. echo "";
    15. }else{
    16. echo "";
    17. echo "Return to registration page";
    18. echo "";

    19. }

    21. ?>

Copy Code

Auth.php used to generate a verification code

  6. Open session, before opening session, no output

  8. Session_Start ();

  12. $width = 50;//Verification Code background width
  14. $height = 26;//Verification Code background High speed
  16. $fonttype = size of Word in 10;//verification code
  18. Prepare the canvas
  20. $im = Imagecreatetruecolor ($width, $height);
  22. Preparing Paint
  24. $black = imagecolorallocate ($im, 0, 0, 0);
  26. $gray = Imagecolorallocate ($im, 200, 200, 200);

  28. Fill background

  30. Imagefill ($im, 0, 0, $gray);

  32. Text coordinates

  34. $x = ($width -4* $fonttype)/2 +2;
  36. $y = ($height-$fonttype)/2 + $fonttype;

  38. Draw an image or text on the canvas

  40. Connect the three arrays.

  42. $strarr = Array_merge (range (1, 9), range (A, z), range (A, z));

  44. Scrambled Array

  46. Shuffle ($strarr);

  48. Array_slice: Take the first few of the array

  50. Join converts an array into a string and breaks it with the first variable
  52. $str = Join ("', Array_slice ($strarr, 0,4));

  54. Put $str into session for easy access to all pages

  56. $_session[' vstr '] = $str;

  58. $file = "E:/php/fonts/msyh.ttf";

  60. $file = "Fonts/msyh.ttf";

  62. Imagettftext ($im, $fonttype, 0, $x, $y, $black, $file, $STR);

  64. Output final image or save final image

  66. Header ("Content-type:image/png");
  68. Imagepng ($im);
  70. Releasing Canvas resources
  72. Imagedestroy ($im);
  74. ?>

Copy Code

PHP Verification Code design: page Jump: 1,php jump

    3. $im = Imagecreatefromjpeg ("lyf.jpg");

    4. $x = Imagesx ($im);

    5. $y = Imagesy ($im);

    6. Echo $x. $y;

    7. Exit

    8. Header ("Content-type:image/jpeg");

    9. Imagejpeg ($im);
    10. ?>

Copy Code

Method two gets the size of the picture:

    3. $imgfile = "Lyf.jpg";

    4. $imgarr = getimagesize ($imgfile);

    5. echo "

      ";  
    6. Print_r ($imgarr);  
    7. echo "
      8. ";

    8. Exit

    9. $im = Imagecreatefromjpeg ("lyf.jpg");

    10. Echo $x. $y;

    11. Header ("Content-type:image/jpeg");

    12. Imagejpeg ($im);
    13. ?>

Copy Code

Picture Zoom function:

  6. $imgfile = "Lyf.jpg";

  8. In order to get the wide height of the big picture

  10. $imgarr = getimagesize ($imgfile);

  12. $MAXW = $imgarr [0];

  14. $maxh = $imgarr [1];
  16. $maxt = $imgarr [2];
  18. $MAXM = $imgarr [' MIME '];

  20. In order to change the big picture into a resource

  22. $im = Imagecreatefromjpeg ("lyf.jpg");

  24. Small map Resources

  26. $MINW = 100;
  28. $minh = 400;

  32. Equal scale Scaling
  34. if (($MINW/$maxw) > ($minh/$maxh)) {
  36. $rate = $minh/$maxh;
  38. }else{
  40. $rate = $MINW/$maxw;
  42. }

  44. $MINW = Floor ($MAXW * $rate);

  46. $minh = Floor ($MAXH * $rate);
  48. $minim = Imagecreatetruecolor ($MINW, $minh);

  50. Scale a large image to a small image

  52. Imagecopyresampled ($minim, $im, 0, 0, 0, 0, $MINW, $minh, $maxw, $maxh);

  54. Small graph output

  56. Header ("content-type:{$MAXM}");

  58. Judging type

  60. Switch ($MAXT) {
  62. Case 1:
  64. $imageout = "Imagegif";
  66. Break
  68. Case 2:
  70. $imageout = "Imagejpeg";
  72. Break
  74. Case 3:
  76. $imageout = "Imagepng";
  78. Break

  80. }

  82. $imageout ($minim);

  84. $minfilename = "S_". $imgfile;
  86. $imageout ($minim, $minfilename);
  88. Imagejpeg ($im);

  92. Freeing resources
  94. Imagedestroy ($maxim);
  96. Imagedestroy ($minim);
  98. ?>

Copy Code

Picture clipping function: imagecopyresampled ();

Image watermark function: imagecopy ();

3, crop

4, Watermark

    3. $maxim = Imagecreatefromjpeg ("lyf.jpg");

    4. $minim = Imagecreatefromjpeg ("lyf.jpg");

    5. $maxw = Imagesx ($maxim);

    6. $maxh = Imagesy ($maxim);

    7. $MINW = Imagesx ($minim);

    8. $minh = Imagesy ($minim);

    9. Imagecopy ($maxim, $minim, $maxw-$MINW, $maxh-$minh, 0, 0, $MINW, $minh);

    10. Header ("Content-type:image/jpeg");

    11. Imagejpeg ($mamim);

    12. ?>

Copy Code

    • This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

    Related Keywords:
    php image processing tutorial php image processing verification code php php call class function without instance php image resize function resize image php function php instance
    Related Article
    Analysis of references and garbage collection in PHP
    PHP service Nginx cannot use file_get_contents workaround
    Get URL address watermelon av url address Thunderbolt url add...
    PHP JavaScript form diseases not passed and form still submitted

    Contact Us

    The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

    If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

    What's Trending
    Top 10 Tags
    datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
    Top 10 Keywords
    microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

    A Free Trial That Lets You Build Big!

    Start building with 50+ products and up to 12 months usage for Elastic Compute Service

    Get Started for Free

    • Sales Support

      1 on 1 presale consultation

      Chat Contact Sales

    • After-Sales Support

      24/7 Technical Support 6 Free Tickets per Quarter Faster Response

      Open a Ticket

    • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

      Learn More