PHP5 image upload code, date folder, random file name_PHP tutorial

index.htm

　

upload.php


$f=$_FILES[jeff_img_upload];

//Judge whether the file has been uploaded
if ($f[error]==4){
echo("<script>alert(Please select the file you want to upload, thank you!);location.href=index.htm;</script>");
}
else{
//Error judgment
if ($f[error]){
echo "Failed, the file is too large! The error code is".$f[error];
exit;
}

//Type judgment
if (substr($f[type], 0, 5) == image) {
switch ($f[type]) {
case image/jpeg:
case image/jpg:
case image/pjpeg:
$ext = .jpg;
break;
case image/gif:
$ext = .gif;
break;
case image/png:
case image/x-png:
$ext = .png;
break;
                                                                                                                                                                                                               default:
header(Content-type: text/html; charset=UTF-8);
                                                                                                                                            with with echo("<script>alert(you didn’t upload a picture, right?);location.href=index.htm;< /script>");<br /> die(REDIRECTING...);<br /> break;<br />                  }<br /> }else {<br /> header(Content-type: text/html; charset=UTF-8);<br /> Echo ("" & lt; script & gt; alert (are you passing by the picture?); Local die(REDIRECTING...);<br />                 }<br /> <br />//Generate random numbers<br /> $randomnum=NULL;<br /> for($j=0;$j<=5;$j++)//The length of the random number. In this example, the length of the random number is 6<br /> {<br /> srand((double)microtime()*1000000);<br /> $randomnumber=rand(!$j ? 1: 0,9);//Generate random numbers, not 0 as the first number, there are some special places where the beginning of 0 is omitted by the system<br /> $randomnum.=$randomnumber;<br /> }<br /> <br /> <br /> $dest_dir=/var/www/htdocs/upload;//Set the upload directory<br /> <br /> //Generate date directory. First determine whether the date directory exists, if not, create it. <br /> if(!file_exists(date("Ymd"))){<br /> mkdir(date("Ymd"),0777);}<br /> <br /> <br /> $dest=$dest_dir./.date("Ymd")./.time()._.$randomnum.$ext;//Set the file name with a timestamp plus a random number to avoid duplication<br /> $r=move_uploaded_file($f[tmp_name],$dest);<br /> chmod($dest, 0777);//Set the attributes of the uploaded file<br /> }<br /> echo "Successful, the file address is: ".$dest;<br /> ?> <p align="left"><div style="display:none;"><span id="url" itemprop="url">http://www.bkjia.com/PHPjc/486550.html<span id="indexUrl" itemprop="indexUrl">www.bkjia.com<span id="isOriginal" itemprop="isOriginal">true<span id="isBasedOnUrl" itemprop="isBasedOnUrl">http: //www.bkjia.com/PHPjc/486550.html<span id="genre" itemprop="genre">TechArticle<span id="description" itemprop="description">index.htm form enctype=multipart/form-data action=upload.php method=post input type=hidden name =MAX_FILE_SIZE value=2000000 input name=userfile type=file input type=submit value=Upload... <div class="art_confoot"></script>