PHP implementation of image thumbnails method, _php tutorial

PHP implementation of image thumbnails method,

This section of the code implementation functionality has these:

Support Jpg,jpeg,gif,png,bmp picture format, support the scale of the original picture to zoom, you can choose whether the picture in the process of scaling the picture needs to be cut, add the picture quality control, you can achieve the highest quality of thumbnail images.

The code for the complete class is as follows:

<?php/*** function: PHP generated thumbnail image class */class resizeimage{public $type;//Picture type public $width;//actual width public $height;//actual height public $ resize_width;//changed width public $resize _height;//After the change of the height of public $cut;//whether the drawing public $srcimg;//source image public $dstimg;// The target image address public $im;//Image public $quality temporarily created;//Picture quality function Resizeimage ($img, $wid, $hei, $c, $dstpath, $quality =100) {$ this->srcimg= $img, $this->resize_width= $wid, $this->resize_height= $hei, $this->cut= $c, $this quality= $quality $this->type=strtolower (substr (STRRCHR ($this->srcimg, '. '), 1);//type of picture $this->initi_img ();//Initialize Image $this-dst_img ($dstpath);//target Image address @ $this->width=imagesx ($this->im); @ $this->height=imagesy ($this->im); $this->newimg ();//Generate Image @imagedestroy ($this->im);} function newimg () {$resize _ratio= ($this->resize_width)/($this->resize_height);//Change the proportion of the image @ $ratio = ($this- >width)/($this->height);//ratio of actual image if (($this->cut) = = ' 1 ') {//Graph if ($img _func=== ' imagepng ' && (str_ Replace ('. ', ', php_version) >=512) {//for PHP version greater than 5.12The processing condition after the parameter change $quality=9;} if ($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, $this->quality);} if ($ratio < $resize _ratio) {//Width priority $newimg=imagecreatetruecolor ($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, $this->quality);}} else{//do not map if ($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, $this->quality);} if ($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, $this->quality);}}} function initi_img () {//Initialize image if ($this->type== ' jpg ' | | $this->type== ' JPEG ') {$this->im=imagecreatefromjpeg ( $this->srcimg);} if ($this->type== ' gif ') {$this->im=imagecreatefromgif ($this->srcimg);} if ($this->type== ' png ') {$this->im=imagecreatefrompng ($this->srcimg);} if ($this->type== ' WBM ') {@ $this->im=imagecreatefromwbmp ($this->srcimg);} if ($this->type== ' bmp ') {$this->im= $this->imagecreatefrombmp ($this->srcimg);}} function Dst_img ($dstpath) {//Image Destination Address $full_length=strlen ($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 $this->dstimg;} function imagecreateFrombmp ($filename) {//Custom function handles BMP picture if (! $f 1=fopen ($filename, "RB")) Returnfalse; $FILE =unpack ("Vfile_type/vfile_size /vreserved/vbitmap_offset ", Fread ($f 1,14)), if ($FILE [' File_type ']!=19778) returnfalse; $BMP =unpack (' vheader_size/ Vwidth/vheight/vplanes/vbits_per_pixel '. ' /vcompression/vsize_bitmap/vhoriz_resolution '. ' /vvert_resolution/vcolors_used/vcolors_important ', fread ($f 1,40)); $BMP [' Colors ']=pow (2, $BMP [' bits_per_pixel ']); if ($BMP [' Size_bitmap ']==0) $BMP [' Size_bitmap ']= $FILE [' file_size ']-$FILE [' Bitmap_offset ']; $BMP [' Bytes_per_pixel '] ]= $BMP [' Bits_per_pixel ']/8; $BMP [' Bytes_per_pixel2 ']=ceil ($BMP [' bytes_per_pixel ']); $BMP [' Decal ']= ($BMP [' width '] * $BMP [' bytes_per_pixel ']/4); $BMP [' Decal ']-=floor ($BMP [' width ']* $BMP [' Bytes_per_pixel ']/4]; $BMP [' Decal ']=4-(4*$ bmp[' decal '); if ($BMP [' decal ']==4) $BMP [' decal ']=0; $PALETTE =array (); if ($BMP [' colors ']<16777216) {$PALETTE = Unpack (' V '. $BMP [' Colors '],fread ($f 1, $BMP [' Colors ']*4)];} $IMG =fread ($f 1, $BMP [' Size_bitmap ']), $VIDE =chr (0), $res =imagecreatetruecolor ($BMP [' width '],$BMP [' height ']), $P =0; $Y = $BMP [' Height ']-1;while ($Y >=0) {$X =0;while ($X < $BMP [' width ']) {if ($BMP [' Bits_per_ Pixel ']==24) $COLOR =unpack ("V", substr ($IMG, $P, 3). $VIDE); ElseIf ($BMP [' Bits_per_pixel ']==16) {$COLOR =unpack ("n", substr ($IMG, $P, 2)); $COLOR [1]= $PALETTE [$COLOR [1]+1];} ElseIf ($BMP [' Bits_per_pixel ']==8) {$COLOR =unpack ("n", $VIDE. substr ($IMG, $P, 1)); $COLOR [1]= $PALETTE [$COLOR [1]+1];} ElseIf ($BMP [' Bits_per_pixel ']==4) {$COLOR =unpack ("n", $VIDE. substr ($IMG, Floor ($P), 1)), if (($P)%2==0) $COLOR [1]= ( $COLOR [1]>>4]; else$color[1]= ($COLOR [1]&0x0f); $COLOR [1]= $PALETTE [$COLOR [1]+1];} ElseIf ($BMP [' Bits_per_pixel ']==1) {$COLOR =unpack ("n", $VIDE. substr ($IMG, Floor ($P), 1)), if (($P *8)%8==0) $COLOR [1]=$ Color[1]>>7;elseif (($P *8)%8==1) $COLOR [1]= ($COLOR [1]&0x40) >>6;elseif (($P *8)%8==2) $COLOR [1]= ($ color[1]&0x20) >>5;elseif (($P *8)%8==3) $COLOR [1]= ($COLOR [1]&0x10) >>4;elseif (($P *8)%8==4) $ Color[1]= ($COLOR [1]&0x8) >>3;elseif (($P *8)%8==5) $COLOR [1]= ($COLOR [1]&0x4) >>2;elseif (($P *8)%8==6) $COLOR [1]= ($COLOR [1]&0x2) >>1;elseif (($P *8)%8==7) $COLOR [1]= ($COLOR [1]&0x1]; $COLOR [ 1]= $PALETTE [$COLOR [1]+1];} Elsereturnfalse;imagesetpixel ($res, $X, $Y, $COLOR [1]), $X + +, $P + = $BMP [' Bytes_per_pixel '];} $Y--; $P + = $BMP [' decal '];} Fclose ($f 1); return$res;}? >

The simple way to use the code is as follows:

$resizeimage =new resizeimage (' upload/abc.bmp ', ' I ', ' n ', ' 0 ', ' upload/xabc.bmp ');

The above code is a small series to share the PHP implementation of image thumbnails of the method, we hope to help!

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