The Introduction to PHP tutorial on image processing skills analysis _php Skills

This example describes the PHP image processing. Share to everyone for your reference, specific as follows:

demo1.php

<?php
  //general generated images can be png,jpg,gif,bmp
  //jpeg,wbmp
  //First step, set file MIME type, output type text/html type is Web page type, default can not write
  Changing output type to Image stream
  header (' content-type:image/png; ');
  The second step, create a graphics area, image background
  //There are two ways to create, resource type, generally add @ symbol, prevent error
  //imagecreatetruecolor returns a resource handle//
  This function creates an image area , the background is black
  $im = Imagecreatetruecolor (200,200) when there is no padding;
  The third step, has the blank image area, draws the color, the text is called, the line ah ...
  //Fill color change, first have a color filler
  //imagecolorallocate--For an image distribution color
  $blue = imagecolorallocate ($im, 0,102,255);
  Fill the blue color onto the background
  //imagefill--area fill
  imagefill ($im, 0,0, $blue);
  Fourth, in the background of the blue input some lines, text and other
  $white = Imagecolorallocate ($im, 255,255,255);
  Imageline--Draw a line segment
  imageline ($im, 0,0,200,200, $white);
  Imageline ($im, 200,0,0,200, $white);
  Imagestring-horizontally draw a line of strings
  imagestring ($im, 5,80,20, ' Mr.one ', $white);
  The fifth step, output final graphics
  //in PNG format to output the image to the browser or file
  imagepng ($im);
  The sixth step, I want all the resources empty
  Imagedestroy ($im);
? >

demo2.php

<?php
  //SRC can insert all kinds of pictures
  //demo1.php is actually a PNG picture
  header (' content-type:text/html; Charset=gbk ');
  Echo ' 

demo3.php

<?php
  //Simple Verification Code
  //random number//
  Why should the number of loops between 0-15?
  //Because to implement the simplest alphanumeric and digital blending
  ///16 0-9 a-f
  //dechex-decimal conversion to hexadecimal
  //create a four-bit captcha for
  ($i =0; $i <4;$ i++) {
    $nmsg. = Dechex (Mt_rand (0,15));
  }
  echo $nmsg;
  Header (' content-type:image/png; ');
  $im = Imagecreatetruecolor (75,25);
  $blue = Imagecolorallocate ($im, 0,102,255);
  $white = Imagecolorallocate ($im, 255,255,255);
  Imagefill ($im, 0,0, $blue);
  Imagestring ($im, 5,20,5, $nmsg, $white);
  Imagepng ($im);
  Imagedestroy ($im);
? >

demo4.php

<?php
  define (' __dir__ ', DirName (__file__). \\');
  Load an existing image
  header (' content-type:image/png; ');
  Header (' content-type:image/jpeg; ');
  Imagecreatefrompng--Create a new image from a PNG file or URL//image to
  load images, can edit the image
  //In the loaded image, add a small watermark
  $im = Imagecreatefrompng (__dir__. ') Ss.png ');
  $im = Imagecreatefromjpeg (' xx.jpg ');
  $white = Imagecolorallocate ($im, 255,255,255);
  Imagestring ($im, 5,10,10, ' http://www.oneStopWeb.cn ', $white);
  Imagepng ($im);
  Imagejpeg ($im);
  Imagedestroy ($im);
? >

demo5.php

<?php
  define (' __dir__ ', DirName (__file__). \\');
  Load an existing image
  header (' content-type:image/png; ');
  Header (' content-type:image/jpeg; ');
  Imagecreatefrompng--Create a new image from a PNG file or URL//image to
  load images, can edit the image
  //In the loaded image, add a small watermark
  $im = Imagecreatefrompng (__dir__. ') Ss.png ');
  $im = Imagecreatefromjpeg (' xx.jpg ');
  $white = Imagecolorallocate ($im, 255,255,255);
  Imagestring ($im, 5,10,10, ' http://www.oneStopWeb.cn ', $white);
  Font fonts must also support Chinese
  $font = ' C:\WINDOWS\Fonts\SIMHEI. TTF ';
  Font file
  $text = iconv (' GBK ', ' utf-8 ', ' read who asked to chant ');
  Using the system-supplied font
  //second parameter, is the font size, the third parameter is the rotation angle, the 4,5 parameter is coordinates
  imagettftext ($im, 20,10,50,100, $white, $font, $text);
  Imagepng ($im);
  Imagejpeg ($im);
  Imagedestroy ($im);
? >

demo6.php

 <?php/thumbnail, not only the size of the surface has changed, the volume has also changed//is really changed, not the surface of the shrinking define (' __dir__ ', dirname (__file__ ).'
  \\');
  Header (' content-type:image/png; '); GetImageSize-Get image size//Get the length and height of the original artwork list ($width, $height) = getimagesize (__dir__. ')
  Ss.png ');
  Scale the original image into 40% $_width = $width * 0.4;
  $_height = $height * 0.4;
  Create a new Diagram $im = Imagecreatetruecolor ($_width,$_height); The work below is to load the original artwork, copy the original image to the new diagram//load the original $_im = Imagecreatefrompng (__dir__. ')
  Ss.png '); Resample the original image, copy it to the new diagram, and finally press 0.4 to output the//imagecopyresampled-resampling the copied part of the image and resizing imagecopyresampled ($im, $_im,0,0,0,0,$_width,$_
  Height, $width, $height);
  Output Imagepng ($im) of the new graph;
  The second parameter is not required, direct null over//third parameter, is 0-100 to adjust the sharpness of JPG//If it is imagepng, then all are HD//imagejpeg ($im, null,50);
  Destruction of Imagedestroy ($im); Imagedestroy ($_im);?> 

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