PHP文件上传
1、upload.php
2、uploadProcess.php
//接收
$username=$_POST['username'];
$fileintro=$_POST['fileintro'];
//echo $username.$fileintro;
//获取文件信息
/* echo "
";<br> print_r($_FILES);<br> echo "";
*/
//获取文件的大小
$file_size=$_FILES['myfile']['size'];
if($file_size>2*1024*1024){
echo "";
exit();
}
//获取文件类型
$file_type=$_FILES['myfile']['type'];
if($file_type!="image/jpeg" && $file_type!="image/pjpeg"){
echo "文件类型只能是 jpg 格式";
exit();
}
//判断上传是否OK
if(is_uploaded_file($_FILES['myfile']['tmp_name'])){
//得到上传的文件 转存到你希望的目录
$upload_file=$_FILES['myfile']['tmp_name'];
//防止图片覆盖问题,为每个用户建立一个文件夹
$user_path=$_SERVER['DOCUMENT_ROOT']."/file/up/".$username;
if(!file_exists($user_path)){
mkdir ($user_path);
}
//$move_to_file=$user_path."/".$_FILES['myfile']['name'];
//防止用户上传用户名相同的问题
$file_true_name=$_FILES['myfile']['name'];
$move_to_file=$user_path."/".time().rand(1,1000).substr($file_true_name,strripos($file_true_name,"."));
//echo $upload_file.$move_to_file;
//中文要转码
if(move_uploaded_file($upload_file,iconv("utf-8","gb2312","$move_to_file"))){
echo $_FILES['myfile']['name']."上传成功";
}else{
echo "上传失败";
}
}else{
echo "上传失败";
}
?>
3、封装:
class Upload{
public $upload_name; //上传文件名
public $upload_tmp_path; //上传文件保存到服务器的temp路径
public $file_size;
public $file_type;
public $file_save_path;
function __construct(){
$this->upload_name=$_FILES['myfile']['name'];
$this->upload_tmp_path=$_FILES['myfile']['tmp_name'];
$this->file_size=$_FILES['myfile']['size'];
$this->file_type=$_FILES['myfile']['type'];
$this->allow_file_type = array('jpeg','jpg','png','gif','bmp','doc','zip','rar','txt','wps','xlsx','ppt');
$this->file_save_path=$_SERVER['DOCUMENT_ROOT']."/file/up/";
}
public function upload_file($username){
//判断文件大小
if($this->file_size>2*1024*1024){
echo "";
exit();
}
//获取文件类型
/* if($this->file_type!="image/jpeg" && $this->file_type!="image/pjpeg"){
echo "文件类型只能是 jpg 格式";
exit();
}
*/ //获取文件的扩展名
$file_type=$this->getFileExt($this->upload_name);
if(!in_array($file_type,$this->allow_file_type)){
echo "上传文件类型格式错误";
exit();
}
//判断上传是否OK
if(is_uploaded_file($this->upload_tmp_path)){
//防止图片覆盖问题,为每个用户建立一个文件夹
$user_path=$this->file_save_path.$username;
if(!file_exists($user_path)){
mkdir ($user_path);
}
//$move_to_file=$user_path."/".$_FILES['myfile']['name'];
//防止用户上传用户名相同的问题
//$file_true_name=$_FILES['myfile']['name'];
$move_to_file=$user_path."/".time().rand(1,1000).substr($this->upload_name,strripos($this->upload_name,"."));
//echo $upload_file.$move_to_file;
//中文要转码
if(move_uploaded_file($this->upload_tmp_path,iconv("utf-8","gb2312","$move_to_file"))){
echo $this->upload_name."上传成功";
}else{
echo "上传失败";
}
}else{
echo "上传失败";
}
}
//获取文件的扩展名
public function getFileExt($filename){
$fileExt=pathinfo($filename);
return $fileExt["extension"];
}
}
?>

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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