PHP Learning Notes-file directory operations (file upload instance)

File operations are required for every language, not just PHP, here we only use PHP to explain

PHP file Advanced operations and file upload examples I put in the last part of the article. --I will also write a php similar to the operation of the network disk example

Note: Read this article, must have a "PHP Chinese manual" or other can query PHP function manual Because the article has a large number of examples, but in order to save space and time, so please consult the PHP manual to understand the function of the specific role

1. PHP open File and close file

Functions used fopen (), fclose () Note: Open files must be closed! Please refer to the PHP manual for specific function parameters.

Instance:

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The fopen () function also supports URL formats in PHP5:

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2. php file Read and write

Read operation-

Functions used ReadFile (), file (), file_get_contents (), fgets (), FGETSS (), fgetc ()

The file location in the example is changed according to your own file, do not tangle with the file location and filename or whatever. Focus on learning

 
  
 <title>File test</title>
 
 
 
    
  
  
 
   
 
    
Use the ReadFile () function to read the contents of the file:
 
    
   
 
   
 
   
 
    
Use the file () function to read the contents of files:
 
    
  "; }?>
 
   
 
   
 
    
Use the file_get_contents () function to read the contents of the file:
 
    
   
 
   
 
  
 
 
 
 
 
    
  
  
 
   
 
    
Use the Fgets () function:
 
    
   
 
   
 
   
 
    
Use the FGETSS () function:
 
    
   
 
   
 
   
 
    
Use the Fgetc () function:
 
    
   
 
   
 
  
 
 

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Write operation-

Functions used Fwrite (), file_put_contents ()

 
  ";    Echo fread ($fp, FileSize ($filename)); Output the rest of the file contents    */    $filepath = "05.txt";    $str = "The feeling can be   recalled just now disconsolate
";    echo "writes the file with the fwrite () function:";    $fopen = fopen ($filepath, "WB") or Die ("file does not exist");    Fwrite ($fopen, $str);    Fclose ($fopen);    ReadFile ($filepath);    echo "
Write the file with the File_put_contents () function: ";    File_put_contents ($filepath, $str);    ReadFile ($filepath);? >

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3, the PHP file itself operation

This example simply enumerates functions and does not run directly. Please change it according to your needs before running

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One, PHP directory operation

Similar to file operations, open and close directories with Opendir (), and Closedir () functions.

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Second, the PHP directory of the Tour

Core function Scandir ()

 
  ";        }    }    else    {        echo ' directory path Error! ";        }? >

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Third, the PHP directory of other operations, get the disk directory size, new delete directory and so on

This example simply enumerates functions and does not run directly. Please change it according to your needs before running

 
  ";    ChDir (".. /");  Change to return the previous level of    echo GETCWD ();//Retrieve the current directory        */* Use the Disk_free_space () function to return the available space in the directory *    /Echo disk_free_space ("d:/")/ Pow (1024,3);  This translates to G, the default is in bytes */        * with the Disk_total_space () function to return the available space in the directory */    echo disk_total_space ("d:/")/pow (1024,3);  This is converted to G, the default is in bytes to display the        */* about PHP5 before the old tour directory method I do not list, here just give the function name: Readdir (), Rewinddir () */?>

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Advanced Application of documents

File pointers:

 
  ";   Total number of bytes output        $fopen = fopen ($filename, "RB");    To open the file, go to echo in the read-only binary file format        "Initial pointer position is:". Ftell ($fopen). "
";  Output pointer position        fseek ($fopen, 3);  Move the pointer        echo "Use the fseek () function after the pointer position:". Ftell ($fopen). "
"; The position of the pointer after the output is moved        echo "outputs the contents after the current pointer:". fgets ($fopen). "
"; Outputs the contents from the current pointer to the end of the line        if (feof ($fopen))   //Determines whether the pointer points to the end of the file        {            echo "the current pointer points to the end of the file:". Ftell ($fopen). "
";  If you point to the end of the file, the output pointer position        }        //Use the rewind () function to return the beginning of the document stream-  once the stream is read to the end, it will not be available again,        //So here's a pointer        to a file again. Rewind ($fopen);          Look at the position of the pointer after using the rewind () function        echo the position of the pointer after using the REWIND () function: ". Ftell ($fopen)."
";          echo "Outputs the first 6 bytes of content:". Fgets ($fopen, 6);  Outputs the first 6 bytes of content        fclose ($fopen);  Close File    }    else    {        echo "file does not exist!"        }? >

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File Lock:

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Uploading of files

Get information about uploading a file:

 
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  $value)  //Use the Foreach Loop output to upload the name and value of the file information            {                echo $name. ' = '. $value. '
";            }        }    ? >

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Real file uploads (from temporary to specified location):

 
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  0)  //Determine file size            {                //upload file                move_uploaded_file ($fileinfo [' Tmp_name '], "upfile/". $fileinfo [' name ']);                echo "File upload succeeded!";            }            else            {                echo "file too large or unknown";                }        }    ? >

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Multiple file uploads:

 
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  ";                }            }        }    ? >

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