Common PHP function libraries and some practical tips

File Read Function
// File Read 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
// File Writing 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 generation function
// Static page generation 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 conditions
// Query 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 ("non-compliant! ");
}
$ Ret. = CHR ($ P );
}
Return $ ret;
}
?>
Paging Function
// Paging Function
Function splitlist ($ halt, $ lrlist, $ echocnt, $ paper, $ table, $ where, $ page_id, $ userid ){
Global $ splitstr, $ sumcnt;
If ($ paper = "" | $ 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 ("no news has been selected for this version! ");
}
$ Paper = 1;
}
$ Sumpaper = ($ sumcnt-$ sumcnt % $ echocnt)/$ echocnt;
If ($ sumcnt % $ echocnt )! = 0) $ sumpaper + = 1;
If ($ sumpaper = 1 & $ halt = 0) Return ($ where );
$ Enwhere = base64_encode (base64_encode ($ where ));
If ($ lrlist * 2 + 1) <$ sumpaper ){
If ($ paper-$ lrlist) <2 ){
$ Tract = 1;
$ Sub = $ lrlist * 2 + 1;
} Else if ($ paper + $ lrlist) >=$ sumpaper ){
$ Tract = $ sumpaper-($ lrlist * 2 );
$ Sub = $ sumpaper;
} Else {
$ Tract = $ paper-$ lrlist;
$ Sub = $ paper + $ lrlist;
}
} Else {
$ Tract = 1;
$ Sub = $ sumpaper;
}
$ Uppaper = $ paper-1;
$ Downpaper = $ paper + 1;
$ Startcnt = ($ paper-1) * $ echocnt;
$ Where. = "Limit $ {startcnt}, $ {echocnt }";
If ($ tract> 1) {$ splitstr = "[<";}
Else $ splitstr = "[<";
For ($ I = $ tract; $ I <= $ sub; $ I ++ ){
If ($ I! = $ Paper) $ splitstr. = "". $ I ."";
Else $ splitstr. = "". $ I ."";
}
If ($ sub! = $ Sumpaper) $ splitstr. = "> ]";
Else $ splitstr. = "> ]";
Return ($ where );
}
?>
Use of paging Functions
/*
#### Retrieve paging functions ####
Int $ halt-whether the page number is displayed (1/0) when the search result is divided into only one page
Int $ lrlist-(number of displayed page numbers-1)/2
Int $ echocnt-number of records displayed per page during retrieval
Int $ paper-page number, pre-extracted: $ paper = $ http_get_vars [Paper];
Varchar $ table-data table name, with a pre-attached value: $ 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 get Mode
Varchar $ splitstr-the output string of the page number. After executing the function, execute echo $ splitstr at the corresponding position;
Get the variable before calling the function-
$ Paper = $ http_get_vars [Paper];
$ Sumcnt = $ http_get_vars [sumcnt];
$ Enwhere = $ http_get_vars [enwhere];
Return (varchar $ where)-Search Condition of the paging query statement
Note: This function calls 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
}
}
TIPS:
How to determine IP address Legality
If (! Strcmp (long2ip (sprintf ("% u", ip2long ($ IP), $ IP) echo "is IPN ";
----
Email Regular Expression judgment
Eregi ("^ [_. 0-9a-za-z-] + @ ([0-9a-za-z] [0-9a-za-z _-] +.) + [A-Za-Z] $", $ email );
Example of checking whether IP addresses and masks are valid
$ IP = '1970. 168.0.84 ';
$ Mask = '2017. 255.255.0 ';
$ Network = '1970. 100 ';
$ IP = ip2long ($ IP );
$ Mask = ip2long ($ mask );
$ Network = ip2long ($ network );
If ($ IP & $ mask) = $ Network) echo "valid IP and maskn ";
?>
----
How to Set File Download header output
Header ("Content-Type: Application/X-download ");
Header ("content-Disposition: attachment; filename = $ file_download_name ;");
Header ("Accept-ranges: bytes ");
Header ("Content-Length: $ download_size ");
Echo 'xxx'
Output FTP download mode with header and support resumable Data Transfer
Example:
Header ('pragma: Public ');
Header ('cache-control: Private ');
Header ('cache-control: No-cache, must-revalidate ');
Header ('Accept-ranges: bytes ');
Header ('Connection: close ');
Header ("Content-Type: Audio/MPEG ");
Header ("Location: ftp: // download: 1bk3l4s3k9s2@232.2.22.22/2222/WEB technology development knowledge base/cn_web.rmvb ");
Regular Expression matching (Chinese)
Ereg ("^ [". CHR (0xa1). "-". CHR (0xff). "] + $", $ Str );
Replace hyperlinks in text in batches
Function urlparse ($ STR = ''){
If (''= $ Str) return $ STR;
$ Types = array ("HTTP", "ftp", "HTTPS ");
$ Replace = <
''.Html entities ('\ 1'hangzhou.html entities (' \ 2 ').''
Eophp;
$ Ret = $ STR;
While (List (, $ type) = each ($ types )){
$ Ret = preg_replace ("| ($ type: //) ([^ \ s] *) | ie", $ replace, $ RET );
}
Return $ ret;
}