PHP generated image based on GD2 graphics library thumbnail class code sharing _php Tutorial

PHP generated image thumbnail class code sharing based on GD2 graphics library

This article mainly introduces the PHP generated image based on the GD2 graphics library thumbnail class code sharing, this article directly give the implementation code and use method, the need for friends can refer to the next

To use PHP to generate image thumbnails, make sure your PHP server has a GD2 graphics library that uses a class to generate thumbnails of pictures

1. How to use

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1 2	$resizeimage = new Resizeimage ("Image source file Address", "200", "100", "0", "thumbnail address"); Just use the above words, you can generate thumbnails, where the source file and thumbnail address can be the same, the 200,100 represents the width and height

2. Thumbnail Class Code

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Use the following class to generate a picture thumbnail, Class Resizeimage { Type of picture var $type; Actual width var $width; Actual height var $height; The width after the change var $resize _width; The height after the change var $resize _height; Whether or not to cut the map var $cut; Source image var $srcimg; Destination image Address var $dstimg; Temporarily created images var $im; function Resizeimage ($img, $wid, $hei, $c, $dstpath) { $this->srcimg = $img; $this->resize_width = $wid; $this->resize_height = $hei; $this->cut = $c; Type of picture $this->type = Strtolower (substr (STRRCHR ($this->srcimg, "."), 1); Initializing an image $this->initi_img (); Destination image Address $this-Dst_img ($dstpath); //-- $this->width = imagesx ($this->im); $this->height = Imagesy ($this->im); Creating images $this->newimg (); Imagedestroy ($this->im); } function newimg () { The proportions of the altered image $resize _ratio = ($this->resize_width)/($this->resize_height); Ratio of actual images $ratio = ($this->width)/($this->height); if (($this->cut) = = "1") Crop chart { if ($ratio >= $resize _ratio) High priority { $newimg = Imagecreatetruecolor ($this->resize_width, $this->resize_height); Imagecopyresampled ($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, (($this Height) * $resize _ratio), $this->height); Imagejpeg ($newimg, $this->dstimg); } if ($ratio < $resize _ratio) Width first { $newimg = Imagecreatetruecolor ($this->resize_width, $this->resize_height); Imagecopyresampled ($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width , (($this->width)/$resize _ratio)); Imagejpeg ($newimg, $this->dstimg); } } Else Do not cut the map { if ($ratio >= $resize _ratio) { $newimg = Imagecreatetruecolor ($this->resize_width, ($this->resize_width)/$ratio); Imagecopyresampled ($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width)/$ratio, $this- >width, $this->height); Imagejpeg ($newimg, $this->dstimg); } if ($ratio < $resize _ratio) { $newimg = Imagecreatetruecolor (($this->resize_height) * $ratio, $this->resize_height); Imagecopyresampled ($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height) * $ratio, $this->resize_height, $ This->width, $this->height); Imagejpeg ($newimg, $this->dstimg); } } } Initializing an image function initi_img () { if ($this->type== "jpg") { $this->im = imagecreatefromjpeg ($this->srcimg); } if ($this->type== "gif") { $this->im = imagecreatefromgif ($this->srcimg); } if ($this->type== "PNG") { $this->im = imagecreatefrompng ($this->srcimg); } } Image Destination Address function Dst_img ($dstpath) { $full _length = strlen ($this->srcimg); $type _length = strlen ($this->type); $name _length = $full _length-$type _length; $name = substr ($this->srcimg,0, $name _length-1); $this->dstimg = $dstpath; Echo $this->dstimg; } }

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