PHP and other proportional compression pictures

<?PHPfunctionResizeimage ($im,$maxwidth,$maxheight,$name,$filetype) {  $pic _width= Imagesx ($im); $pic _height= Imagesy ($im); if(($maxwidth&&$pic _width>$maxwidth) || ($maxheight&&$pic _height>$maxheight))  {   if($maxwidth&&$pic _width>$maxwidth)   {    $widthratio=$maxwidth/$pic _width; $resizewidth _tag=true; }    if($maxheight&&$pic _height>$maxheight)   {    $heightratio=$maxheight/$pic _height; $resizeheight _tag=true; }    if($resizewidth _tag&&$resizeheight _tag)   {    if($widthratio<$heightratio)     $ratio=$widthratio; Else     $ratio=$heightratio; }    if($resizewidth _tag&&!$resizeheight _tag)    $ratio=$widthratio; if($resizeheight _tag&&!$resizewidth _tag)    $ratio=$heightratio; $newwidth=$pic _width*$ratio; $newheight=$pic _height*$ratio; if(function_exists("imagecopyresampled"))   {    $newim= Imagecreatetruecolor ($newwidth,$newheight);//PHP System FunctionsImagecopyresampled ($newim,$im, 0,0,0,0,$newwidth,$newheight,$pic _width,$pic _height);//PHP System Functions   }   Else   {    $newim= Imagecreate ($newwidth,$newheight); Imagecopyresized ($newim,$im, 0,0,0,0,$newwidth,$newheight,$pic _width,$pic _height); }    $name=$name.$filetype; Imagejpeg ($newim,$name); Imagedestroy ($newim); }  Else  {   $name=$name.$filetype; Imagejpeg ($im,$name); } }//How to use:$im=imagecreatefromjpeg ("./20140416103023202.jpg");//parameter is the storage path of the picture$maxwidth= "600";//set the maximum width of a picture$maxheight= "400";//set the maximum height of a picture$name= "123";//the name of the picture, pick it up.$filetype= ". jpg";//type of pictureResizeimage ($im,$maxwidth,$maxheight,$name,$filetype);//Call the function above

Online excerpt, not yet tested.

PHP and other proportional compression pictures