Question

我有一些图像被上传到具有随机文件名的网站，例如

http://www.mysite.com/uploads/images/apicture23.jpg
http://www.mysite.com/uploads/images/anotherpicture203.jpeg
http://www.mysite.com/uploads/images/another.picture203.png
http://www.mysite.com/uploads/images/athird-picture101.gif

在PHP中是否有可能以某种方式在文件扩展名（.jpg，.jpeg .png或.gif）之前立即插入另一个字符串，例如{{} 1}}？

Answer 1

$out = preg_replace('/\.[a-z]+$/i','-300x200\0',$in);

这基本上是这样做的，从左到右阅读：

它会替换以点（\.）开头的所有内容，后跟+范围内的一个或多个（a-z）字符，最后（$）字符串，不区分大小写（i），-300x200后跟匹配的字符串部分（\0）。

Answer 2

如果您希望在上传图片时重命名文件名，那么下面的课程将为您提供帮助：

<?php

    function thumbnail( $img, $source, $dest, $maxw, $maxh ) {      
        $jpg = $source.$img;

        if( $jpg ) {
            list( $width, $height  ) = getimagesize( $jpg ); //$type will return the type of the image
            $source = imagecreatefromjpeg( $jpg );

            if( $maxw >= $width && $maxh >= $height ) {
                $ratio = 1;
            }elseif( $width > $height ) {
                $ratio = $maxw / $width;
            }else {
                $ratio = $maxh / $height;
            }

            $thumb_width = round( $width * $ratio ); //get the smaller value from cal # floor()
            $thumb_height = round( $height * $ratio );

            $thumb = imagecreatetruecolor( $thumb_width, $thumb_height );
            imagecopyresampled( $thumb, $source, 0, 0, 0, 0, $thumb_width, $thumb_height, $width, $height );

            $path = $dest.$img."-300x200.jpg";
            imagejpeg( $thumb, $path, 75 );
        }
        imagedestroy( $thumb );
        imagedestroy( $source );
    }

?>

哪里

      $img         => image file name
      $source      => the path to the source image
      $dest        => the path to the destination image
      $maxw        => the maximum of the image width you desire
      $maxh        => the minimum one

将字符串插入字符串？

2 个答案: