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Homephp教程php手册php使用ob_start()实现图片存入变量的方法

这篇文章主要介绍了php使用ob_start()实现图片存入变量的方法,是对缓存的灵活运用,具有既定的参考借鉴价值,需要的朋友可以参考下

本文实例讲述了php使用ob_start()实现图片存入变量的方法。分享给大家供大家参考。具体实现方法如下:

用php的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

复制代码 代码如下:

$imgPath ="图片地址" ;
//获得图片信息 $imgPath 可以为远程地址
list( $srcWidth, $srcHeight, $type ) = getimagesize( $imgPath );
...
switch( $type ) {
case 1: $imgCreate = 'ImageCreateFromGIF'; break;
case 2: $imgCreate = 'ImageCreateFromJPEG'; break;
case 3: $imgCreate = 'ImageCreateFromPNG'; break;
default: return false;
}
$orig = $imgCreate( $imgPath );
...
//开启缓存
ob_start();
//生成图片
switch ($type)
{
case 1: imagegif($orig); break;
case 2: imagejpeg($orig); break; // best quality
case 3: imagepng($orig); break; // no compression
default: echo ''; break;
}
//将图片存入变量
$imageCode = ob_get_contents();
ob_end_clean();


个人不建义把图片保存在变量,这样会比较浪费资源 ,这里也是测试一下而已。

希望本文所述对大家的PHP程序设计有所帮助。

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