PHP text operations _ PHP Tutorial

PHP text Operation class. Copy the code as follows :? PhpclassCtbClass {var $ file; var $ index; create a file and write the input functionnull_write ($ new) {$ ffopen ($ this-file, w); flock ($ f, LOCK_EX); fput The code is as follows:

Class CtbClass {

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;
}


}
?>

The http://www.bkjia.com/PHPjc/317060.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/317060.htmlTechArticle code is as follows :? Php classCtbClass {var $ file; var $ index; // create a file and write the input functionnull_write ($ new) {$ f = fopen ($ this-file, "w "); flock ($ f, LOCK_EX); fput...