PHP image processing Class (generate thumbnails, add watermarks, get picture information) _php Tutorial

PHP Tutorial Image Processing class (generate thumbnails, add watermarks, get picture information)
This article provides this image processing class, he can do things have the image generated thumbnails, may add watermark to the image and get the picture information, is a more practical code and concise function */

Class image
{
Public $info =array ();

function __construct ()
{
!extension_loaded (' GD ') && exit ("www.bKjia.c0m Hint: the server environment does not support the GD library");
return true;
}

function image ()
{
$this->__construct ();
}

function Thumb ($image, $thumb _width=300, $thumb _height=225)
{
$info = $this->info ($image);
$scale =min (1,min ($thumb _width/$info [' width '], $thumb _height/$info [' height ']); Scale by scaling
$thumb _width=intval ($info [' width ']* $scale);
$thumb _height=intval ($info [' Height ']* $scale);
$createfunc = ' Imagecreatefrom '. ($info [' type ']== ' jpg '? ' JPEG ': $info [' type ']);
$im = $createfunc ($image);
$thumb _im= $info [' type ']!= ' gif ' && function_exists (' Imagecreatetruecolor ')? Imagecreatetruecolor ($thumb _ width, $thumb _height): Imagecreate ($thumb _width, $thumb _height);
Imagecopyresampled ($thumb _im, $im, 0,0,0,0, $thumb _width, $thumb _height, $info [' width '], $info [' height ']);
if ($info [' type ']== ' gif ' | | $info [' type ']== ' png ')
{
$bgcolor =imagecolorallocate ($thumb _im,0,255,0);
Imagecolortransparent ($thumb _im, $bgcolor);
}
$imagefunc = ' image '. ($info [' type ']== ' jpg '? ' JPEG ': $info [' type ']);
$thumbname = ' thumb_ '. $info [' name ']. '. '. $info [' type '];
$imagefunc ($thumb _im, $info [' path ']. $thumbname);
Imagedestroy ($im);
Imagedestroy ($thumb _im);
return $info [' path ']. $thumbname;
}

function watermark ($image, $pos =9, $watermarkimg = ' images/watermark.gif ', $pct =65, $text = ', $w _font=5, $w _color= ' # ff0000 ')
{
$imageinfo = $this->info ($image);
$source _w= $imageinfo [' width '];
$source _h= $imageinfo [' height '];
$imagecreatefunc = ' Imagecreatefrom '. ($imageinfo [' type ']== ' jpg '? ' JPEG ': $imageinfo [' type ']);
$im = $imagecreatefunc ($image);
if (!empty ($watermarkimg) && file_exists ($watermarkimg))//Add Picture watermark
{
$iswaterimage =true;
$watermarkinfo = $this->info ($watermarkimg);
$width = $watermarkinfo [' width '];
$height = $watermarkinfo [' height '];
$watermarkcreatefunc = ' Imagecreatefrom '. ($watermarkinfo [' type ']== ' jpg '? ' JPEG ': $watermarkinfo [' type ']);
$watermark _im= $watermarkcreatefunc ($watermarkimg);
}
else//Add text watermark
{
$iswaterimage =false;
if (!empty ($w _color) && strlen ($w _color) ==7)
{
$r =hexdec (substr ($w _color,1,2));
$g =hexdec (substr ($w _color,3,2));
$b =hexdec (substr ($w _color,5,2));
}
$temp = Imagettfbbox (ceil ($w _font*2.5), 0, ' Fonts/alger.ttf ', $text);
$width = $temp [2]-$temp [6];
$height = $temp [3]-$temp [7];
Unset ($temp);
}
Switch ($POS)
{
Case 0:
$WX = Mt_rand (0, ($source _w-$width));
$wy = Mt_rand (0, ($source _h-$height));
Break
Case 1:
$WX = 5;
$wy = 5;
Break
Case 2:
$WX = ($source _w-$width)/2;
$wy = 5;
Break
Case 3:
$WX = $source _w-$width-5;
$wy = 5;
Break
Case 4:
$WX = 5;
$wy = ($source _h-$height)/2;
Break
Case 5:
$WX = ($source _w-$width)/2;
$wy = ($source _h-$height)/2;
Break
Case 6:
$WX = $source _w-$width-5;
$wy = ($source _h-$height)/2;
Break
Case 7:
$WX = 5;
$wy = $source _h-$height-5;
Break
Case 8:
$WX = ($source _w-$width)/2;
$wy = $source _h-$height-5;
Break
Default
$WX = $source _w-$width-5;
$wy = $source _h-$height-5;
Break
}
if ($iswaterimage)
{
if ($imageinfo [' type '] = = ' png ') {
Imagecopy ($im, $watermark _im, $wx, $wy, 0, 0, $width, $height);
} else {
Imagecopymerge ($im, $watermark _im, $wx, $wy, 0, 0, $width, $height, $pct);
}
}
Else
{
Imagestring ($im, $w _font, $wx, $wy, $text, Imagecolorallocate ($im, $r, $g, $b));
}
$imagefunc = ' image '. ($imageinfo [' type ']== ' jpg '? ' JPEG ': $imageinfo [' type ']);
$imagefunc ($im, $image);
Imagedestroy ($im);
return true;
}

function info ($image)
{
$info =array ();
$info [' Size ']=filesize ($image);
$imageinfo =getimagesize ($image);
$info [' width ']= $imageinfo [0];
$info [' Height ']= $imageinfo [1];
$info [' width_height ']= $imageinfo [3];
$info [' MIME ']= $imageinfo [' MIME '];
Unset ($imageinfo);
$imageinfo =pathinfo ($image);
$info [' Path ']= $imageinfo [' dirname ']. ' /';
$info [' type ']=strtolower ($imageinfo [' extension ']); Picture type, not including '. '
$info [' name ']= $imageinfo [' filename '];
Unset ($imageinfo, $name);
$this->info= $info;
return $info;
}
}

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