Php class for text file operations

Php class for text file operations

Var $ file; Var $ index; // Create a file and write it into the input. Function null_write ($ new ){ $ F = fopen ($ this-> file, "w "); Flock ($ f, LOCK_EX ); Fputs ($ f, $ new ); Fclose ($ f ); } // Add data records to the end of the file Function add_write ($ new ){ $ F = fopen ($ this-> file, ""); Flock ($ f, LOCK_EX ); Fputs ($ f, $ new ); Fclose ($ f ); } // Used together with the returned results of readfile () to convert a row of data into a one-dimensional array Function make_array ($ line ){ $ Array = explode ("\ x0E", $ line ); Return $ array; } // Convert a row of data into a one-dimensional array Function join_array ($ line ){ $ Array = join ("\ x0E", $ line); return $ array; } // Total number of returned data files Function getlines (){ $ F = file ($ this-> file ); Return count ($ f ); } // Return the data record of the next row (standby) Function next_line (){ $ This-> index = $ this-> index ++; Return $ this-> get (); } // Return the data record of the previous row (standby) Function prev_line (){ $ This-> index = $ this-> index --; Return $ this-> get (); } // The returned data record for the current row is small Function get (){ $ F = fopen ($ this-> file, "r "); Flock ($ f, LOCK_SH ); For ($ I = 0; $ I <= $ this-> index; $ I ++ ){ $ Rec = fgets ($ f, 1024 ); } $ Line = explode ("\ x0E", $ rec ); Fclose ($ f ); Return $ line; } // The returned data of the current row is large. Function get_big_file (){ $ F = fopen ($ this-> file, "r "); Flock ($ f, LOCK_SH ); For ($ I = 0; $ I <= $ this-> index; $ I ++ ){ $ Rec = fgets ($ f, 1024*5 ); } $ Line = explode ("\ x0E", $ rec ); Fclose ($ f ); Return $ line; } // Open the data file --- return the file content in a one-dimensional array Function read_file (){ If (file_exists ($ this-> file )){ $ Line = file ($ this-> file ); } Return $ line; } // Open the data file --- return the file content in a two-dimensional array Function openFile (){ If (file_exists ($ this-> file )){ $ F = file ($ this-> file ); $ Lines = array (); Foreach ($ f as $ rawline ){ $ Tmpline = explode ("\ x0E", $ rawline ); Array_push ($ lines, $ tmpline ); } } Return $ lines; } // Input an array, merge it into a row of data, and overwrite the entire file Function overwrite ($ array ){ $ Newline = implode ("\ x0E", $ array ); $ F = fopen ($ this-> file, "w "); Flock ($ f, LOCK_EX ); Fputs ($ f, $ newline ); Fclose ($ f ); } // Add a row of data records to the end of the file Function add_line ($ array, $ check_n = 1 ){ $ S = implode ("\ x0E", $ array ); $ F = fopen ($ this-> file, ""); Flock ($ f, LOCK_EX ); Fputs ($ f, $ s ); If ($ check_n = 1) Fputs ($ f, "\ n "); Fclose ($ f ); } // Insert a data record to the beginning of the file Function insert_line ($ array ){ $ Newfile = implode ("\ x0E", $ array ); $ F = fopen ($ this-> file, "r "); Flock ($ f, LOCK_SH ); While ($ line = fgets ($ f, 1024 )){ $ Newfile. = $ line; } Fclose ($ f ); $ F = fopen ($ this-> file, "w "); Flock ($ f, LOCK_EX ); Fputs ($ f, $ newfile ); Fclose ($ f ); } // Update all qualified data records, applicable to the large data size in each row Function update ($ column, $ query_string, $ update_array ){ $ Update_string = implode ("\ x0E", $ update_array ); $ Newfile = ""; $ Fc = file ($ this-> file ); $ F = fopen ($ this-> file, "r "); Flock ($ f, LOCK_SH ); For ($ I = 0; $ I $ List = explode ("\ x0E", $ fc [$ I]); If ($ list [$ column]! = $ Query_string ){ $ Newfile = $ newfile. chop ($ fc [$ I]). "\ n "; } Else { $ Newfile = $ newfile. $ update_string; } } Fclose ($ f ); $ F = fopen ($ this-> file, "w "); Flock ($ f, LOCK_EX ); Fputs ($ f, $ newfile ); Fclose ($ f ); } // Update all data records that meet the conditions, applicable to the case where each row has small bytes of data Function update2 ($ column, $ query_string, $ update_array ){ $ Newline = implode ("\ x0E", $ update_array ); $ Newfile = ""; $ F = fopen ($ this-> file, "r "); Flock ($ f, LOCK_SH ); While ($ line = fgets ($ f, 1024 )){ $ TmpLine = explode ("\ x0E", $ line ); If ($ tmpLine [$ column] = $ query_string ){ $ Newfile. = $ newline; } Else { $ Newfile. = $ line; } } Fclose ($ f ); $ F = fopen ($ this-> file, "w "); Flock ($ f, LOCK_EX ); Fputs ($ f, $ newfile ); Fclose ($ f ); } // Delete all data records that meet the conditions, which is suitable for large bytes of data in each row. Function delete ($ column, $ query_string ){ $ Newfile = ""; $ Fc = file ($ this-> file ); $ F = fopen ($ this-> file, "r "); Flock ($ f, LOCK_SH ); For ($ I = 0; $ I $ List = explode ("\ x0E", $ fc [$ I]); If ($ list [$ column]! = $ Query_string ){ $ Newfile = $ newfile. chop ($ fc [$ I]). "\ n "; } } Fclose ($ f ); $ F = fopen ($ this-> file, "w "); Flock ($ f, LOCK_EX ); Fputs ($ f, $ newfile ); Fclose ($ f ); } // Delete all data records that meet the conditions, applicable to the case where the data in each row is small Function delete2 ($ column, $ query_string ){ $ Newfile = ""; $ F = fopen ($ this-> file, "r "); Flock ($ f, LOCK_SH ); While ($ line = fgets ($ f, 1024 )){ $ TmpLine = explode ("\ x0E", $ line ); If ($ tmpLine [$ column]! = $ Query_string ){ $ Newfile. = $ line; } } Fclose ($ f ); $ F = fopen ($ this-> file, "w "); Flock ($ f, LOCK_EX ); Fputs ($ f, $ newfile ); Fclose ($ f ); } // Obtain the maximum value of a field in a file Function get_max_value ($ column ){ $ Tlines = file ($ this-> file ); For ($ I = 0; $ I <= count ($ tlines); $ I ++ ){ $ Line = explode ("\ x0E", $ tlines [$ I]); $ Get_value [] = $ line [$ column]; } $ Get_max_value = max ($ get_value ); Return $ get_max_value; } // Query based on whether a field in the data file contains $ query_string. all qualified data is returned using a two-dimensional array. Function select ($ column, $ query_string ){ $ Tline = $ this-> openfile (); $ Lines = array (); Foreach ($ tline as $ line ){ If ($ line [$ column] ==$ query_string ){ Array_push ($ lines, $ line ); } } Return $ lines; } // Functions are the same as function select (), and the speed may be slightly improved Function select2 ($ column, $ query_string ){ If (file_exists ($ this-> file )){ $ Tline = $ this-> read_file (); Foreach ($ tline as $ tmpLine ){ $ Line = $ this-> make_array ($ tmpLine ); If ($ line [$ column] ==$ query_string ){ $ Lines [] = $ tmpLine; } } } Return $ lines; } // Query whether a field in the data file contains $ query_string. the first qualified data is returned in a one-dimensional array. Function select_line ($ column, $ query_string ){ $ Tline = $ this-> read_file (); Foreach ($ tline as $ tmpLine ){ $ Line = $ this-> make_array ($ tmpLine ); If ($ line [$ column] ==$ query_string ){ Return $ line; Break; } } } // Select next/prev line (next_prev => 1/next, 2/prev) by cx Function select_next_prev_line ($ column, $ query_string, $ next_prev ){ $ Tline = $ this-> read_file (); $ Line_key_end = count ($ tline)-1; $ Line_key =-1; Foreach ($ tline as $ tmpLine ){ $ Line_key ++; $ Line = $ this-> make_array ($ tmpLine ); If ($ next_prev = 1 ){ // Next? If ($ line [$ column] ==$ query_string ){ If ($ line_key = 0 ){ Return 0; } Else { $ Line_key_up = $ line_key-1; Return $ up_line; } } Else { $ Up_line = $ line; } } Elseif ($ next_prev = 2 ){ // Prev? If ($ line [$ column] ==$ query_string ){ If ($ line_key = $ line_key_end ){ Return 0; } Else { $ Line_key_down = $ line_key + 1; Break; } } } Else { Return 0; } } $ Down_line = $ this-> make_array ($ tline [$ line_key_down]); Return $ down_line; } ?>

Text file, php