php修改上传图片尺寸的方法
本文实例讲述了php修改上传图片尺寸的方法。分享给大家供大家参考。具体实现方法如下：
<?php //ThisisthetemporaryfilecreatedbyPHP $uploadedfile=$_FILES['uploadfile']['tmp_name']; //CreateanImagefromitsowecandotheresize $src=imagecreatefromjpeg($uploadedfile); //Capturetheoriginalsizeoftheuploadedimage list($width,$height)=getimagesize($uploadedfile); //Forourpurposes,Ihaveresizedtheimagetobe //600pixelswide,andmaintaintheoriginalaspect //ratio.Thispreventstheimagefrombeing"stretched" //or"squashed".Ifyouprefersomemaxwidthotherthan //600,simplychangethe$newwidthvariable $newwidth=600; $newheight=($height/$width)*600; $tmp=imagecreatetruecolor($newwidth,$newheight); //thislineactuallydoestheimageresizing,copyingfromtheoriginal //imageintothe$tmpimage imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height); //nowwritetheresizedimagetodisk.Ihaveassumedthatyouwantthe //resized,uploadedimagefiletoresideinthe./imagessubdirectory. $filename="images/".$_FILES['uploadfile']['name']; imagejpeg($tmp,$filename,100); imagedestroy($src); imagedestroy($tmp); //NOTE:PHPwillcleanupthetempfileitcreatedwhentherequest //hascompleted. ?>
希望本文所述对大家的php程序设计有所帮助。