How to implement PHP thumbnail image

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 qualityfunctionResizeimage ($img,$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 imagesif(($this->cut) = = ' 1 ') {//Crop Chartif($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,$this-quality); }   }Else{//do not cut the mapif($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 imageif($this->type== ' jpg ' | |$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 picturesif(!$f 1=fopen($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:

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The above describes the PHP image thumbnail implementation method, including the aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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