PHP thumbnail code, imagecopyresampled function generate thumbnail image

function CreateImage ($SRCIMAGEURL, $DirImageUrl, $Width, $Height) { $img; $SRCW; $new _width; $srch; $new _height; Type of picture $type = substr (STRRCHR ($SrcImageUrl, "."), 1); Initializing an image if ($type = = "jpg") $img = Imagecreatefromjpeg ($SRCIMAGEURL); if ($type = = "gif") $img = Imagecreatefromgif ($SRCIMAGEURL); if ($type = = "png") $img = Imagecreatefrompng ($SRCIMAGEURL); $SRCW = Imagesx ($img); $srch = Imagesy ($img); if ($SRCW/$srch > $Width/$Height) { if ($SRCW > $Width) { $new _width = $Width; $new _height = $srch * ($Width/$SRCW); } Else { $new _width = $SRCW; $new _height = $srch; } } Else { if ($srch > $Height) { $new _height = $Height; $new _width = $SRCW * ($Height/$srch); } Else { $new _width = $SRCW; $new _height = $srch; } } $new _image = Imagecreatetruecolor ($new _width, $new _height); Imagecopyresampled ($new _image, $img, 0, 0, 0, 0, $new _width, $new _height, $SRCW, $srch); Imagejpeg ($new _image, $DIRIMAGEURL); Imagedestroy ($IMG); Imagedestroy ($new _image); } Copy Code 3. Post-Improvement code: /* * $o _photo Original path * $d image path after _photo processing * $width definition width * $height defined High * Call Method Cutphoto ("Test.jpg", "temp.jpg", 256,146); */ function Cutphoto ($o _photo, $d _photo, $width, $height) { $temp _img = imagecreatefromjpeg ($o _photo); $o _width = imagesx ($temp _img); Get the original width $o _height = Imagesy ($temp _img); Get the original height Judgment Processing method if ($width > $o _width | | $height > $o _height) {//Huantuquan or higher than the specified size, compression $newwidth = $o _width; $newheight = $o _height; if ($o _width> $width) { $newwidth = $width; $newheight = $o _height* $width/$o _width; } if ($newheight > $height) { $newwidth = $newwidth * $height/$newheight; $newheight = $height; } Thumbnail image $new _img = Imagecreatetruecolor ($newwidth, $newheight); Imagecopyresampled ($new _img, $temp _img, 0, 0, 0, 0, $newwidth, $newheight, $o _width, $o _height); Imagejpeg ($new _img, $d _photo); Imagedestroy ($new _img); }else{//original wide chart and high ratio of the specified size, compression after cutting if ($o _height* $width/$o _width> $height) {//Make sure width is the same as specified, OK if height is greater than specified $newwidth = $width; $newheight = $o _height* $width/$o _width; $x = 0; $y = ($newheight-$height)/2; }else{//Otherwise determined height is the same as the specified width adaptive $newwidth = $o _width* $height/$o _height; $newheight = $height; $x = ($newwidth-$width)/2; $y = 0; } Thumbnail image $new _img = Imagecreatetruecolor ($newwidth, $newheight); Imagecopyresampled ($new _img, $temp _img, 0, 0, 0, 0, $newwidth, $newheight, $o _width, $o _height); Imagejpeg ($new _img, $d _photo); Imagedestroy ($new _img); $temp _img = imagecreatefromjpeg ($d _photo); $o _width = imagesx ($temp _img); Get thumbnail width $o _height = Imagesy ($temp _img); Get thumbnail height Crop a picture $new _IMGX = Imagecreatetruecolor ($width, $height); Imagecopyresampled ($new _imgx, $temp _img,0,0, $x, $y, $width, $height, $width, $height); Imagejpeg ($new _imgx, $d _photo); Imagedestroy ($new _IMGX); } } ?> Copy Code

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