PHP gd library generation thumbnail _php tutorial

PHP GD Library
PHP uses the GD library to generate thumbnails.
Code:

6. Header ("CONTENT-TYPE:TEXT/HTML;CHARSET=GBK");
8. Ini_set ("Date.timezone","Asia/chong");
10. //Determine if the file is empty
12. if (empty($_files)) {
14. Echo "Upload file too large" ;
16. Exit ;
18. }
20. //Determine if there is an error in file upload
22. if ($_files[' pic '] [' ERROR ']) {
24. Echo "Upload file";
26. Exit ;
28. }
30. //Determine if file type is illegally getting file suffix
32. $allowtype = Array ("jpg","png","JPEG","gif");
34. $a = Explode ('.' , $_files [' pic '] [' name '];
36. $index = Count ($a)-1;
38. $ex = Strtolower ($a[$index]);
40. if (!in_array ($ex,$allowtype)) {
42. Echo "Illegal uploading of files";
44. Exit ;
46. }
48. $file = Date (' ymdhis '). Rand (). "." . $ex ;
50. $src = $_files [' pic '] [' Tmp_name '];
52. $des = "upload/" . $file ;
54. $rs =move_uploaded_file ($src,$des);
58. //thumbnail image
60. //Read already uploaded pictures
62. $image =imagecreatefromjpeg ($des);
64. $a = getimagesize ($des);
66. $w = $a [0];
68. $h = $a [1];
70. if ($w>$h) {
72. $width =300;
74. $height = $width / $w * $h ;
76. }Else if($w<$h) {
78. $height =300;
80. $width = $height / $h * $w ;
82. }Else{
84. $width =300;
86. $height =300;
88. } www.jbxue.com
90. //Create blank new picture
92. $newimage =imagecreatetruecolor ($width, $height);
94. //copy Source Picture content copy new picture
96. Imagecopyresized ($newimage, $image, 0,0, 0,0 , $width, $height, $w, $h);
98. $filename = "Upload/s_" . $file ;
100. Imagejpeg ($newimage,$filename);

http://www.bkjia.com/PHPjc/714728.html www.bkjia.com true http://www.bkjia.com/PHPjc/714728.html techarticle PHP GD library PHP uses the GD library to generate thumbnails. Code: formmethod= "POST" action= "suo_do.php" enctype= "Multipart/form-data" inputtype= "file" name= "pic"/inputtype= "Sub MIT "Value= ...

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