File upload and download learning notes (2)---Multi-file, single-file, multiple single-file function encapsulation

One: Leading knowledge points:

1:is_string () Determines whether a variable is a string Is_array determines whether a variable is an array

The 2:pathinfo () function can get the file extension.

3: Create a directory function mkdir ()

4: Generate a unique random number uniqid ()

5: Determine if files, directories exist File_exsits ()

Second: Ideas and processes

Three: Encapsulated function code

1<?PHP2 /**3 * Get the desired file type4 * @return Unknown5  */6 functionGetFiles () {7     $i= 0;8     foreach($_files  as $file ) {9         //Judging is a single fileTen         if(is_string($file[' Name '] )) { One             $files[$i] =$file; A             $i++; -         //Judging is multiple files -}ElseIf(Is_array($file[' Name '] )) { the             foreach($file[' Name '] as $k=$v ) { -                 $files[$k] [' name '] =$v; -                 $files[$k] [' type '] =$file[' type '] [$k]; -                 $files[$k] [' tmp_name '] =$file[' Tmp_name '] [$k]; +                 $files[$k] [' ERROR '] =$file[' ERROR '] [$k]; -                 $files[$k] [' size '] =$file[' Size '] [$k]; +             } A         } at     } -     return $files; - } - /** - * Upload Files - * @param unknown $fileInfo in * @return String -  */ to functionUploadfiles ($fileInfo,$path= "TTT",$allowExt=Array(' jpg ', ' jpeg ', ' png ', ' gif '),$maxSize= 20000000,$flag=false) { +     //get the file name extension via PathInfo -     $ext=PathInfo($fileInfo[' Name '],pathinfo_extension); the     //get a unique name for a file *     $uniName=MD5(uniqid(Microtime(true),true) ) . ‘.‘ .$ext; $     $destination=$path. ‘/‘ .$uniName;Panax Notoginseng     $res[' mes '] =NULL; -     //If the directory does not exist, create a directory the     if(!file_exists($path )) { +         mkdir($path, 0777,true ); A     } the     //Judging the error number +     if($fileInfo[' error '] = = 0) { -         //Determine file size $         if($fileInfo[' Size '] >$maxSize) { $             $res[' mes '] =$fileInfo[' name ']. " Upload file too large "; -         } -         //determine file type the         if(!In_array($ext,$allowExt )) { -             $res[' mes '] =$fileInfo[' name ']. " File format is incorrect ";Wuyi         } the         //determine if the picture is true -         if($flag) { Wu             if(!getimagesize($fileInfo[' Tmp_name '] )) { -                 $res[' mes '] =$fileInfo[' name ']. " Not a real picture "; About             } $         } -         //determine whether to upload via HTTP POST -         if(!Is_uploaded_file($fileInfo[' Tmp_name '] )) { -             $res[' mes '] =$fileInfo[' name ']. " File upload path is incorrect "; A         } +         //If there is a value, end the return the         if($res[' Mes ']) -             return $res; $             //Moving Files the         if(Move_uploaded_file($fileInfo[' Tmp_name '],$destination )) { the             $res[' mes '] =$fileInfo[' name ']. " File Upload Successful "; the             $res[' DST '] =$destination; the         } -         return $res; in}Else { the         Switch($fileInfo[' Error ']) { the              Case1: About                 $res[' Mes ']=$fileInfo[' name ']. ' The upload file exceeds the value of the upload_max_filesize option '; the                  Break; the              Case2: the                 $res[' Mes ']=$fileInfo[' name ']. ' exceeds the size of the form max_file_size limit '; +                  Break; -              Case5 | the                 $res[' Mes ']=$fileInfo[' name ']. ' File Upload not complete ';Bayi                  Break; the              Case4: the                 $res[' Mes ']=$fileInfo[' name ']. ' No option to upload file '; -                  Break; -              Case6: the                 $res[' Mes ']=$fileInfo[' name ']. ' No temp directory found '; the                  Break; the              Case7: the                 $res[' Mes ']=$fileInfo[' name ']. ' File write Failed '; -                  Break; the              Case: X the                 $res[' Mes ']=$fileInfo[' name ']. ' File upload interrupted by php extension '; the                  Break;94         } the         return $res; the     } the}

File upload and download learning notes (2)---Multi-file, single-file, multiple single-file function encapsulation