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Homephp教程php手册php ob_start()实现图片存入变量程序

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:

<?php
$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 = &#39;ImageCreateFromGIF&#39;;
        break;
    case 2:
        $imgCreate = &#39;ImageCreateFromJPEG&#39;;
        break;
    case 3:
        $imgCreate = &#39;ImageCreateFromPNG&#39;;
        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 &#39;&#39;;
        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 了,这样会比较浪费资源 ,这里也是测试好玩的哦.


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