PHP image Thumbnail Implementation method, _php tutorial

PHP image thumbnail Implementation method,

Function: Support jpg,jpeg,gif,png,bmp picture format, support the scale of the original picture, you can choose whether to cut the picture in the process of image zooming, add the picture quality control, can achieve the highest quality of thumbnail image. The code for the complete class is as follows:

 Php/** * Function: PHP generated thumbnail image of the class*/ classresizeimage{ Public $type;//type of picture   Public $width;//Actual width   Public $height;//actual height   Public $resize _width;//the width after the change   Public $resize _height;//the height after the change   Public $cut;//whether or not to cut the map   Public $srcimg;//Source Image   Public $dstimg;//Destination Image Address   Public $im;//temporarily created images   Public $quality;//Picture quality  functionResizeimage ($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 ();//Initializing an image   $this-Dst_img ($dstpath);//Destination Image Address@$this->width=imagesx ($this-im); @$this->height=imagesy ($this-im); $this->newimg ();//Creating Images@ImageDestroy ($this-im); }  functionnewimg () {$resize _ratio=($this->resize_width)/($this->resize_height);//The proportions of the altered image@$ratio=($this->width)/($this->height);//ratio of actual images   if(($this->cut) = = ' 1 ') {//Crop Chart    if($img _func= = = ' Imagepng ' && (Str_replace('.','',php_version) (>=512)) {//for processing after the PHP version is greater than 5.12 parameter changes     $quality=9; }    if($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 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,$this-quality); }   }Else{//do not cut the map    if($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,$this->dstimg,$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); }   }  }  functionIniti_img () {//Initializing an 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 ($this-srcimg); }  }  functionDst_img ($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 $this->dstimg;  }      functionImagecreatefrombmp ($filename){//Custom Function processing BMP pictures   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); $BMP[' Decal ']=4-($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 ', ' n ', ' n ', ' 0 ', ' upload/xabc.bmp ');

Related reading:

PHP generated image thumbnail class code share

How to generate thumbnail images in bulk in PHP

PHP Picture thumbnail class Phpthumb

How to implement PHP thumbnail image

PHP upload images generated thumbnails (GD library)

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