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Php image processing function example and php verification code

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Php image processing function example and php verification code

  3. // Prepare the canvas

  4. $ Im = imagecreatetruecolor (500,300 );

  5. // Prepare paint

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

  7. $ White = imagecolorallocate ($ im, 255,255,255 );

  8. // Fill the background in black

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

  10. // Draw a rectangle and fill it in white

  11. Imagefilledellipse ($ im, 258,151,200,200, $ white );
  12. // Output to the browser or save it
  13. Header ("content-type: image/png ");
  14. // Output image
  15. Imagepng ($ im );

  16. // Close the canvas

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

Php image processing function 1, math function 2, image processing function

Mathematical functions: 1, max (); 2, min (); 3, mt_rand (); random number

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

Mt_rand random value

  3. // Obtain a random 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. ?>

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. ?>

6. pi (); // π obtain the circumference rate

  2. Echo (pi ());
  3. Echo M_PI;
  4. ?>

Image processing function scenario 1. verification code 2. scaling 3. cropping 4. watermark

Five steps for wearing an image in php 1. prepare the Canvas 2. prepare the paint 3. draw an image or text on the canvas 4. output the final image or caocun final image 5. release the canvas resources

Example:

  3. // 1. prepare the canvas

  4. $ Im = imagecreatetruecolor (500,300 );
  5. // 2. prepare 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 filled, the default value is black.
  10. Imageellipse ($ im, 258,151,200,200, $ white );

  11. // 4. output or save the final image

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

Draw an image: imagefill (); imagesetpixel (); // draw the pixel imageline (); // draw the line imagerectangle (); // draw a rectangle imagepolygon (); // draw a polygon imageellipse (); // draw an elliptical imageare (); draw an arc imagechar (); // horizontally draw a character imagestring (); // draw a line of string horizontally

Example:

  3. // Draw a line

  4. // 1. prepare the canvas
  5. $ Im = imagecreatetruecolor (500,300 );
  6. // 2. prepare 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 filled, the default value 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 or save the final image

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

Example:

  3. // Add interferon

  4. // 1. prepare the canvas
  5. $ Im = imagecreatetruecolor (500,300 );
  6. // 2. prepare 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 random points
  11. For ($ I = 0; I I <1000; $ I ++ ){

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

  13. }

  14. // Generate random lines

  15. For ($ j = 0; $ j <100; $ j ++ ){

  16. Imageline ($ im, mt_rand (0,500), mt_rand (0,300), mt_rand (0,500), mt_rand (0,300), $ white );
  17. } // 4. output or save the final image
  18. Header ("content-type: image/png ");
  19. Imagepng ($ im );
  20. // 5. release canvas resources
  21. Imagedestroy ($ im );
  22. ?>

Example:

  3. // Draw a rectangle:

  4. // 1. prepare the canvas
  5. $ Im = imagecreatetruecolor (500,300 );
  6. // 2. prepare 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, 20, 20,480,280, $ white );//
  11. Imagefilledrectangle ($ im, 20, 20,480,280, $ white); // fill

  12. // 4. output or save the final image

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

Example:

  3. // Imagepolygon: polyg_draw a triangle

  4. // 1. prepare the canvas
  5. $ Im = imagecreatetruecolor (500,300 );
  6. // 2. prepare 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 or save the final image

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

Example: draw a 3D pie chart

  3. // 1. prepare the canvas

  4. $ Im = imagecreatetruecolor (500,300 );
  5. // 2. prepare the paint
  6. $ Black = imagecolorallocate ($ im, 0, 0, 0 );
  7. $ Red = imagecolorallocate ($ im, 255, 0, 0 );
  8. $ Grayred = imagecolorallocate ($ im, 255,100,100 );
  9. $ Green = imagecolorallocate ($ im, 0,255, 0 );
  10. $ Blue = imagecolorallocate ($ im, 0, 0,255 );
  11. $ Gray = imagecolorallocate ($ im, 200,200,200 );
  12. $ White = imagecolorallocate ($ im, 255,255,255 );

  13. // 3. draw an image or text on the canvas

  14. For ($ I = 0; $ I <10; $ I ++ ){
  15. Imagefilledarc ($ im, 250,150 + $ I, 200,200, 0, 70, $ gray, IMG_ARC_PIE );
  16. Imagefilledarc ($ im, 250,150 + $ I, 200,200, 70,190, $ grayred, IMG_ARC_PIE );
  17. Imagefilledarc ($ im, 250,150 + $ I, 200,200,190,270, $ green, IMG_ARC_PIE );
  18. Imagefilledarc ($ im, 250,150 + $ I, 200,200,270,360, $ blue, IMG_ARC_PIE );

  19. }

  20. Imagefilledarc ($ im, 250,150,200,200, 0, 70, $ white, IMG_ARC_PIE );
  21. Imagefilledarc ($ im, 250,150,200,200, 70,190, $ red, IMG_ARC_PIE );
  22. Imagefilledarc ($ im, 250,150,200,200,190,270, $ green, IMG_ARC_PIE );
  23. Imagefilledarc ($ im, 250,150,200,200,270,360, $ blue, IMG_ARC_PIE );

  24. // 4. output or save the final image

  25. Header ("content-type: image/png ");
  26. Imagepng ($ im );
  27. // 5. release canvas resources
  28. Imagedestroy ($ im );
  29. ?>

Example:

  3. // Write text:

  4. // 1. prepare the canvas
  5. $ Im = imagecreatetruecolor (500,300 );
  6. // 2. prepare 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, 5,260,160, $ str, $ green );

  17. // 4. output or save the final image
  18. Header ("content-type: image/png ");
  19. Imagepng ($ im );
  20. // 5. release canvas resources
  21. Imagedestroy ($ im );
  22. ?>

Example:

  3. // Write a single character:

  4. // 1. prepare the canvas
  5. $ Im = imagecreatetruecolor (500,300 );
  6. // 2. prepare 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, 5,260,160, $ str, $ green );

  17. // 4. output or save the final image
  18. Header ("content-type: image/png ");
  19. Imagepng ($ im );
  20. // 5. release canvas resources
  21. Imagedestroy ($ im );
  22. ?>

Example,

  3. // Write on the image

  4. // 1. prepare the canvas
  5. $ Im = imagecreatetruecolor (500,300 );
  6. // 2. prepare 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 = "junzaivip ";

  16. $ File = "E:/PHP/fonts/SIMYOU. TTF ";
  17. // $ File = "fonts/SIMYOU. TTF ";

  18. Imagettftext ($ im, 50, 0,100,200, $ green, $ file, $ str );

  19. // 4. output or save the final image

  20. Header ("content-type: image/png ");
  21. Imagepng ($ im );
  22. // 5. release canvas resources
  23. Imagedestroy ($ im );
  24. ?>

PHP verification code design

  3. // Prepare the canvas

  4. $ Im = imagecreatetruecolor (100,50 );
  5. // Prepare paint
  6. $ Black = imagecolorallocate ($ im, 0, 0, 0 );
  7. $ Gray = imagecolorallocate ($ im, 200,200,200 );

  8. // Fill in the background

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

  10. // Text coordinate

  11. $ X = (100-4*20)/2 + 6;
  12. $ Y = (50-20)/2 + 20;

  13. // Draw an image or text on the canvas

  14. // Associate the three arrays

  15. $ Strarr = array_merge (range (1, 9), range (a, z), range (A, Z ));

  16. // Disrupt the array

  17. Shuffle ($ strarr );

  18. // Array_slice: obtains the first few digits of the array.

  19. // Join converts the array into a string and uses the first variable as the separator.
  20. $ Str = join ('', array_slice ($ strarr, 0, 4 ));

  21. $ File = "E:/PHP/fonts/msyh. ttf ";

  22. // $ File = "fonts/msyh. ttf ";

  23. Imagettftext ($ im, 20, 0, $ x, $ y, $ black, $ file, $ str );

  24. // Output or save the final image

  25. Header ("content-type: image/png ");
  26. Imagepng ($ im );
  27. // Release canvas resources
  28. Imagedestroy ($ im );
  29. ?>

Php verification code design: two pages are involved: index. php & reg. php description:

This verification code version only allows you to dynamically obtain the verification code of the verification image on the registration page at the front end and compare the verification code generated for the image. the verification code consists of numbers, lowercase letters, and uppercase letters.

Index. php // implement user registration

  5. Reg
  9. User registration page

Reg. php // used to verify whether 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. // Jump to the page
  14. Echo "script location = 'http: // www.xingzuo51.com 'script";
  15. } Else {
  16. Echo "script" alert ('verification code input error') script ";
  17. // Echo "return to registration page ";
  18. Echo "script location = 'index. php' script";

  19. }

  21. ?>

Auth. php is used to generate a verification code

  3. // Enable session. no output is allowed before the session is enabled.

  4. Session_start ();

  6. $ Width = 50; // verification code background width
  7. $ Height = 26; // verification code background high speed
  8. $ Fonttype = 10; // The size of the characters in the verification code
  9. // Prepare the canvas
  10. $ Im = imagecreatetruecolor ($ width, $ height );
  11. // Prepare paint
  12. $ Black = imagecolorallocate ($ im, 0, 0, 0 );
  13. $ Gray = imagecolorallocate ($ im, 200,200,200 );

  14. // Fill in the background

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

  16. // Text coordinate

  17. $ X = ($ width-4 * $ fonttype)/2 + 2;
  18. $ Y = ($ height-$ fonttype)/2 + $ fonttype;

  19. // Draw an image or text on the canvas

  20. // Associate the three arrays

  21. $ Strarr = array_merge (range (1, 9), range (a, z), range (A, Z ));

  22. // Disrupt the array

  23. Shuffle ($ strarr );

  24. // Array_slice: obtains the first few digits of the array.

  25. // Join converts the array into a string and uses the first variable as the separator.
  26. $ Str = join ('', array_slice ($ strarr, 0, 4 ));

  27. // Put $ str into the session to facilitate use on all pages

  28. $ _ SESSION ['vstr'] = $ str;

  29. $ File = "E:/PHP/fonts/msyh. ttf ";

  30. // $ File = "fonts/msyh. ttf ";

  31. Imagettftext ($ im, $ fonttype, 0, $ x, $ y, $ black, $ file, $ str );

  32. // Output or save the final image

  33. Header ("content-type: image/png ");
  34. Imagepng ($ im );
  35. // Release canvas resources
  36. Imagedestroy ($ im );
  37. ?>

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. ?>

Method 2: obtain the image size:

  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. ?>

Image scaling function:

  3. $ Imgfile = "lyf.jpg ";

  4. // To obtain the width and height of a large image

  5. $ Imgarr = getimagesize ($ imgfile );

  6. $ Maxw = $ imgarr [0];

  7. $ Maxh = $ imgarr [1];
  8. $ Maxt = $ imgarr [2];
  9. $ Maxm = $ imgarr ['Mime '];

  10. // To change a large image to a resource

  11. $ Im = imagecreatefromjpeg ("lyf.jpg ");

  12. // Map resource

  13. $ Minw = 100;
  14. $ Minh = 400;

  16. // Proportional scaling
  17. If ($ minw/$ maxw)> ($ minh/$ maxh )){
  18. $ Rate = $ minh/$ maxh;
  19. } Else {
  20. $ Rate = $ minw/$ maxw;
  21. }

  22. $ Minw = floor ($ maxw * $ rate );

  23. $ Minh = floor ($ maxh * $ rate );
  24. $ Minim = imagecreatetruecolor ($ minw, $ minh );

  25. // Scale a large image to a small image

  26. Imagecopyresampled ($ minim, $ im, 0, 0, 0, $ minw, $ minh, $ maxw, $ maxh );

  27. // Small image output

  28. Header ("content-type: {$ maxm }");

  29. // Determine the type

  30. Switch ($ maxt ){
  31. Case 1:
  32. $ Imageout = "imagegif ";
  33. Break;
  34. Case 2:
  35. $ Imageout = "imagejpeg ";
  36. Break;
  37. Case 3:
  38. $ Imageout = "imagepng ";
  39. Break;

  40. }

  41. $ Imageout ($ minim );

  42. $ Minfilename = "s _". $ imgfile;
  43. $ Imageout ($ minim, $ minfilename );
  44. // Imagejpeg ($ im );

  46. // Release resources
  47. Imagedestroy ($ maxim );
  48. Imagedestroy ($ minim );
  49. ?>

Image cropping 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. ?>

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 library php image processing tutorial php image processing verification code php php mail function example code php batch processing example php form processing example
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