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PHP image processing function Instance Daquan and PHP verification code

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Tags imagecopy imagejpeg mathematical functions shuffle
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    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. ?>

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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. ?>
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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. ?>

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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. ?>

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6.pi (); Pi take pi

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

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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. ?>

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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. ?>

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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. ?>

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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. ?>

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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. ?>

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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. ?>

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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. ?>

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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. ?>

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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. ?>

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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

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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. ?>

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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. ?>

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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. ?>

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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. ?>

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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. ?>

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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. ?>

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    Related Keywords:
    php image processing library php image processing verification code php php call class function without instance php image resize function resize image php function php instance

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