php ob_start()实现图片存入变量程序

2014-06-18 为码而活 PHP教程 关注1.48K次 已收录
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正文概述

用php GD库 处理完图片后 只能将图片 用 imagejpeg() 输出 或者写入一个文件很多时候并不需要这么做 比如要将图片存入数据库 就需要把图片写入变量保存用 ob_start() 启用缓存 ob_get_contents()获取缓存就可以将图片写入变量

实例代码如下:

  1. <?php 
  2. $imgPath ="图片地址" ; 
  3. //获得图片信息 $imgPath 可以为远程地址 
  4. list( $srcWidth, $srcHeight, $type ) = getimagesize( $imgPath ); 
  5. … 
  6. switch( $type ) { 
  7. case 1: $imgCreate = 'ImageCreateFromGIF'; break; 
  8. case 2: $imgCreate = 'ImageCreateFromJPEG'; break; 
  9. case 3: $imgCreate = 'ImageCreateFromPNG'; break; 
  10. default: return false; 
  11. } 
  12. $orig = $imgCreate( $imgPath ); 
  13. … 
  14. //开启缓存 
  15. ob_start(); 
  16. //生成图片 
  17. switch ($type) 
  18. { 
  19. case 1: imagegif($orig); break; 
  20. case 2: imagejpeg($orig); break; // best quality 
  21. case 3: imagepng($orig); break; // no compression 
  22. default: echo ''; break; 
  23. } 
  24. //将图片存入变量 
  25. $imageCode = ob_get_contents(); 
  26. ob_end_clean(); 

个人不建义把图片保存在变量 了,这样会比较浪费资源 ,这里也是测试好玩的哦.

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