PHP image processing tutorial (1/3) _ PHP Tutorial

PHP image processing tutorial (13 ). PHP image processing Getting Started Tutorial This php image generation tutorial is a php Tutorial from generating a simple image to generating a complex image, in a simple way, there are 12 image generation instances. PHP image processing Getting Started Tutorial This php image generation tutorial is a php Tutorial from generating a simple image to generating a complex image, in a simple way, there are 12 image generation instances. 1. generate a simple image.

Php Tutorial image and graphics processing tutorial
This php image generation tutorial is a php Tutorial from generating a simple image to generating a complex image. There are 12 simple examples of generating images.

1. generate a simple image.
2. set the image color.
3. draw a straight line on the image.
4. display text on the image.
5. display Chinese characters in the image.
6. open an existing image.
7. obtain Image attributes.
The usage of the 8 function getimagesize.
9. add the watermark effect to the uploaded image.
10. generate a thumbnail of an existing image.
11 Use the imagecopyresampled () function ().
12. php program that generates a digital verification code image with a bottom line.

*/

// 1 generate a simple image.

$ Width = 200;
$ Height = 200;

$ Img = imagecreatetruecolor ($ width, $ height) or die ("gd image processing not supported ");
Imagepng ($ img );
Imagedestroy ($ img );

// 2 set the image color.

$ Width = 200;
$ Height = 200;

$ Img = imagecreatetruecolor ($ width, $ height) or die ("gd image processing not supported ");

$ Bg_color = imagecolorallocate ($ img, 255, 0, 0 );
Imagefill ($ img, 0, 0, $ bg_color );

Imagepng ($ img );
Imagedestroy ($ img );

// 3 Draw a straight line on the image.

$ Width = 200;
$ Height = 300;

$ Img = imagecreatetruecolor ($ width, $ height) or die ("gd image processing not supported ");

$ Line_color = imagecolorallocate ($ img, 255,255,255 );
Imageline ($ img, $ line_color );
Imageline ($ img, 0,260,200,260, $ line_color );

Imagepng ($ img );
Imagedestroy ($ img );

// 4. display text on the image.

$ Width = 200;
$ Height = 300;

$ Img = imagecreatetruecolor ($ width, $ height) or die ("gd image processing not supported ");
$ Line_color = imagecolorallocate ($ img, 255,255,255 );

Imageline ($ img, 0, 40,200, 40, $ line_color );
Imageline ($ img, 0,260,200,260, $ line_color );
Imagestring ($ img, 5, 0, 60, "it's time to learn php! ", $ Line_color );

Imagepng ($ img );
Imagedestroy ($ img );

// 5 display Chinese characters in the image.

$ Width = 200;
$ Height = 300;

$ Img = imagecreatetruecolor ($ width, $ height) or die ("gd image processing not supported ");
$ Line_color = imagecolorallocate ($ img, 255,255,255 );
$ Font_type = "c: // windows // fonts // simli. ttf"; // Obtain the truetype font, in which the letter of intent is used

// "Journey to the West" with three hexadecimal characters
$ Cn_char1 = chr (0xe8). chr (0xa5). chr (0xbf );
$ Cn_char2 = chr (0xe6). chr (0xb8). chr (0xb8 );
$ Cn_char3 = chr (0xe8). chr (0xae). chr (0xb0 );

// 4 hexadecimal characters for "Wu Chengen"
$ Cn_str = chr (0xe5 ). chr (0x90 ). chr (0xb4 ). chr (0xe6 ). chr (0x89 ). chr (0xbf ). chr (0xe6 ). chr (0x81 ). chr (0xa9 );
$ Cn_str. = "". chr (0xe8). chr (0x91). chr (0x97 );

Imageline ($ img, 0, 40,200, 40, $ line_color );
Imageline ($ img, 0,260,200,260, $ line_color );

// Display the word "journey to the West" in a vertical bar
Imagettftext ($ img, 30, 0, 10, 80, $ line_color, $ font_type, $ cn_char1 );
Imagettftext ($ img, 30, 0, 10,120, $ line_color, $ font_type, $ cn_char2 );
Imagettftext ($ img, 30, 0, 10,160, $ line_color, $ font_type, $ cn_char3 );

// Display the word "Wu Chengen" in the horizontal layout
Imagettftext ($ img, 15, 0, 90,254, $ line_color, $ font_type, $ cn_str );

Imagepng ($ img );
Imagedestroy ($ img );

// 6 open an existing image.
$ Img = imagecreatefromjpeg ("tower.jpg ");

Imagejpeg ($ img );
Imagedestroy ($ img );

// 7. obtain the attributes of the image.
$ Img = imagecreatefromjpeg ("tower.jpg ");

$ X = imagesx ($ img );
$ Y = imagesy ($ img );
Echo "the width of image tower.jpg is:$ XPixels ";
Echo"
";
Echo"
";
Echo "the height of image tower.jpg is:$ YPixels ";

// Usage of the 8-function getimagesize.
$ Img_info = getimagesize ("tower.jpg ");

For ($ I = 0; $ I <4; ++ $ I)
{
Echo $ img_info [$ I];
Echo"
";
}

?>
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