php实现从上传文件创建缩略图的方法
本文实例讲述了php实现从上传文件创建缩略图的方法。分享给大家供大家参考。具体实现方法如下：
<?php
if($_REQUEST['action']=="add"){
$userfile=$HTTP_POST_FILES['photo']['tmp_name'];
$userfile_name=$HTTP_POST_FILES['photo']['name'];
$userfile_size=$HTTP_POST_FILES['photo']['size'];
$userfile_type=$HTTP_POST_FILES['photo']['type'];
/////////////////////////
//GET-DECLAREDIMENSIONS//
$dimension=getimagesize($userfile);
$large_width=$dimension[0];//GETPHOTOWIDTH
$large_height=$dimension[1];//GETPHOTOHEIGHT
$small_width=120;//DECLARETHUMBWIDTH
$small_height=90;//DECLARETHUMBHEIGHT
/////////////////////////
//CHECKSIZE//
if($userfile_size>102400){
$error=1;
$msg="Thephotoisover100kb.Pleasetryagain.";
}
////////////////////////////////
//CHECKTYPE(IEANDOTHERS)//
if($userfile_type="image/pjpeg"){
if($userfile_type!="image/jpeg"){
$error=1;
$msg="ThephotomustbeJPG";
}
}
//////////////////////////////
//CHECKWIDTH/HEIGHT//
if($large_width!=600or$large_height!=400){
$error=1;
$msg="Thephotomustbe600x400pixels";
}
///////////////////////////////////////////
//CREATETHUMB/UPLOADTHUMBANDPHOTO///
if($error<>1){
$image=$userfile_name;//ifyouwanttoinsertittothedatabase
$pic=imagecreatefromjpeg($userfile);
$small=imagecreatetruecolor($small_width,$small_height);
imagecopyresampled($small,$pic,0,0,0,0,$small_width,$small_height,$large_width,$large_height);
if(imagejpeg($small,"path/to/folder/to/upload/thumb".$userfile_name,100)){
$large=imagecreatetruecolor($large_width,$large_height);
imagecopyresampled($large,$pic,0,0,0,0,$large_width,$large_height,$large_width,$large_height);
if(imagejpeg($large,"path/to/folder/to/upload/photo".$userfile_name,100))
{}
else{$msg="Aproblemhasoccured.Pleasetryagain.";$error=1;}
}
else{
$msg="Aproblemhasoccured.Pleasetryagain.";$error=1;
}
}
//////////////////////////////////////////////
///Ifeverythingwentrightaphoto(600x400)and
///athumb(120x90)wereuploadedtothegivenfolders
}
?>
<html><head><title>createthumb</title></head>
<body>
<formname="form1"enctype="multipart/form-data"action="thisfile.php?action=add"method="post">
SelectPhoto:<inputtype="file"name="photo">
<inputtype="submit"name="submit"value="CREATETHUMBANDUPLOAD">
</form>
</body
</html>
希望本文所述对大家的php程序设计有所帮助。