Several useful functions for learning PHP dynamic web skills collection

Some useful functions can be retained as source code to avoid repeated writing in the future. File reading function // file reading function functionPHP_Read ($ file_name) {$ fd = fopen ($ file_name, r); while ($ bufline = fgets ($ fd, 4096 )) {$ buf. = $ bufline ;}

Some useful functions can be retained as source code to avoid repeated writing in the future.

File reading function

// File reading function
Function PHP_Read ($ file_name ){
$ Fd = fopen ($ file_name, r );
While ($ bufline = fgets ($ fd, 4096 )){
$ Buf. = $ bufline;
}
Fclose ($ fd );
Return $ buf;
}
?>

File writing function

// Write the file into the function
Function PHP_Write ($ file_name, $ data, $ method = 'w '){
$ Filenum = @ fopen ($ file_name, $ method );
Flock ($ filenum, LOCK_EX );
$ File_data = fwrite ($ filenum, $ data );
Fclose ($ filenum );
Return $ file_data;
}
?>

Static page native functions

// Static page native function
Function phptohtm ($ filefrom, $ fileto, $ u2u = 1 ){
If ($ u2u = 1 ){
$ Data = PHP_Read ($ filefrom );
} Else {
$ Data = $ filefrom;
}
PHP_Write ($ fileto, $ data );
Return true;
}
?>

Number of specified condition information retrieval functions

// Search the number of specified conditions
Function rec_exist ($ table, $ where ){
$ Query = 'SELECT count (*) as num from $ Table'. $ where;
$ Result = mysql_query ($ query) or die (nerror (1 ));
$ Rowcount = mysql_fetch_array ($ result );
$ Num = $ rowcount ['num'];
If ($ num = 0 ){
Return false;
}
Return $ num;
}
?>

Directory deletion function

// Directory deletion function
Function del_DIR ($ directory ){
$ Mydir = dir ($ directory );
While ($ file = $ mydir-> read ()){
If (is_dir ('$ directory/$ file') AND ($ file! = '.') AND ($ file! = '..')){
Del_DIR ('$ directory/$ file ');
} Else {
If ($ file! = '.') AND ($ file! = '..')){
Unlink ('$ directory/$ file ');
// Echo 'unlink $ directory/$ file OK ';
}
}
}
$ Mydir-> close ();
Rmdir ($ directory );
// Echo 'rmdir $ directory OK ';
}
?>

Directory name validity check function

// Check the validity of the directory name
Function isen ($ str ){
$ Ret = '';
For ($ I = 0; $ I $ p = ord (substr ($ str, $ I, 1 ));
If ($ p <48 & $ p! = 45 & $ p! = 46) | ($ p> 57 & $ p <65) | ($ p> 90 & $ p <97 & $ p! = 95) ||$ p> 122 ){

Nerror ('noncompliant! ');
}
$ Ret. = chr ($ p );
}
Return $ ret;
}
?>

Paging functions

// Paging function
Function splitlist ($ HALT, $ LRLIST, $ ECHOCNT, $ ***, $ table, $ where, $ page_id, $ userid ){
Global $ splitstr, $ sumcnt;
If ($ *** = ''| $ sumcnt = ''){
$ Query = 'SELECT count (*) as num from $ table $ where ';
$ Result = mysql_query ($ query );
$ Row = mysql_fetch_array ($ result );
$ Sumcnt = $ row ['num'];
If ($ sumcnt = 0 ){
Nerror ('The announcement message has not been selected in this version! ');
}
$ *** = 1;
}
$ Sum *** = ($ sumcnt-$ sumcnt % $ ECHOCNT)/$ ECHOCNT;
If ($ sumcnt % $ ECHOCNT )! = 0) $ sum *** = 1;
If ($ sum *** = 1 & $ HALT = 0) return ($ where );
$ Enwhere = base64_encode (base64_encode ($ where ));
If ($ LRLIST * 2 1) <$ sum ***){
If ($ ***-$ LRLIST) <2 ){
$ Tract = 1;
$ Sub = $ LRLIST * 2 1;
} Else if ($ *** $ LRLIST) >=$ sum ***){
$ Tract = $ sum ***-($ LRLIST * 2 );
$ Sub = $ sum ***;
} Else {
$ Tract = $ ***-$ LRLIST;
$ Sub = $ *** $ LRLIST;
}
} Else {
$ Tract = 1;
$ Sub = $ sum ***;
}
$ Up *** = $ ***-1;
$ Down *** = $ *** 1;
$ Startcnt = ($ ***-1) * $ ECHOCNT;
$ Where. = 'limit $ {startcnt}, $ {ECHOCNT }';
If ($ tract> 1) {$ splitstr = '[<';}
Else $ splitstr = '[<';
For ($ I = $ tract; $ I <= $ sub; $ I ){
If ($ I! = $ ***) $ Splitstr. = ''. $ I .'';
Else $ splitstr. = ''. $ I .'';
}
If ($ sub! = $ Sum ***) $ splitstr. = '> ]';
Else $ splitstr. = '> ]';
Return ($ where );
}
?>

Application clarification of paging functions

/*
#### Retrieve paging functions ####
Int $ HALT-whether the page number is displayed (1/0) when only one page is displayed for the search result
Int $ LRLIST-(number of displayed page numbers-1)/2
Int $ ECHOCNT-number of records displayed per page during retrieval
Int $ ***-number of pages, pre-extracted: $ *** = $ HTTP_GET_VARS [***];
Varchar $ table-name of the data table, with the following values: $ table = 'DB. table ';
Varchar $ where-search condition, with a value prefixed: $ where = 'Where field = 'value '';
Varchar $ enwhere-encode the original $ where twice and then submit it in the GET method
Varchar $ splitstr-the output string of the page number. after the function is executed, echo $ splitstr is executed in the corresponding position;

Get the variable before calling the function-
$ *** = $ HTTP_GET_VARS [***];
$ Sumcnt = $ HTTP_GET_VARS [sumcnt];
$ Enwhere = $ HTTP_GET_VARS [enwhere];
Return (Varchar $ where)-Search condition of the paging query statement
Note: This function must call the error handling function nerror ($ error );
*/
?>

Image file upload function

// Image file upload function
Function upload_img ($ UploadFile, $ UploadFile_name, $ UploadFile_size, $ UploadPath, $ max_size = 64 ){
// $ TimeLimit = 60; // Set the time-out period. The default time is 30 seconds. if the value is set to 0, the time-out period is not limited.
// Set_time_limit ($ TimeLimit );
If ($ UploadFile! = 'None') & ($ UploadFile! = '')){
$ FileName = $ UploadPath. $ UploadFile_name;
If ($ UploadFile_size <1024 ){
$ FileSize = '(string) $ UploadFile_size'. 'Byte ';
} Elseif ($ UploadFile_size <(1024 * $ max_size )){
$ FileSize = number_format (double) ($ UploadFile_size/1024), 1). 'KB ';
} Else {
Nerror ('The file size exceeds the limit! ');
}
//{
// $ FileSize = 'number _ format (double) ($ UploadFile_size '/(1024*1024), 1). 'mb ';
//}
If (! File_exists ($ FileName )){
If (copy ($ UploadFile, $ FileName )){
Return '$ UploadFile_name ($ FileSize )';
} Else {
Nerror ('file $ UploadFile_name Upload failed! ');
}
Unlink ($ UploadFile );
} Else {
Nerror ('file $ UploadFile_name already exists! ');
}
// Set_time_limit (30); // restore the default timeout value
}
}
?>