Summary of common PHP skills

This article provides a detailed summary of common PHP skills. interested friends can refer to this article to share multiple common php skills for your reference. the specific content is as follows:

1. php file read function

// Function PHP_Read ($ file_name) {$ fd = fopen ($ file_name, r); while ($ bufline = fgets ($ fd, 4096) {$ buf. = $ bufline;} fclose ($ fd); return $ buf ;}?>

2. 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 ;}?>

3. 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 ;}?>

4. specify the number of condition information to retrieve.

// 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 ;}?>

5. Directory deletion function

// Directory deletion 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";}?>

6. directory name validity check function

// 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 ("not compliant with specifications !");} $ Ret. = chr ($ p);} return $ ret;}?>

7. PHP paging functions

// Paging 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 in PHP
8. PHP image file upload function

// Function upload_img ($ UploadFile, $ UploadFile_name, $ UploadFile_size, $ UploadPath, $ max_size = 64) {// $ TimeLimit = 60; // Set the timeout limit. the default time is 30 seconds. if it is set to 0, it 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:
1. how does PHP determine IP address legality?

If (! Strcmp (long2ip (sprintf ("% u", ip2long ($ ip), $ ip) echo "is ipn "; -- eregi ("^ [_. 0-9a-zA-Z-] + @ ([0-9a-zA-Z] [0-9a-zA-Z _-] + .) + [a-zA-Z] $ ", $ email); an example of checking whether the ip address and mask are valid $ ip = '100. 168.0.84 '; $ mask = '2017. 255.255.0 '; $ network = '2017. 168.0 '; $ ip = ip2long ($ ip); $ mask = ip2long ($ mask); $ network = ip2long ($ network); if ($ ip & $ mask) ==$ network) echo "valid ip and maskn";?> --

2. how to set the php 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'

3. PHP uses the header to output the ftp download method and supports 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 ");

4. PHP regular expression matching

ereg(“^[".chr(0xa1)."-".chr(0xff)."]+$”, $str);

5. replace hyperlinks in the text in batches

function urlParse($str = ”){if (” == $str) return $str;$types = array(“http”, “ftp”, “https”);$replace = <<”.htmlentities('1′).htmlentities('2′).”EOPHP;$ret = $str;while(list(,$type) = each($types)){$ret = preg_replace(“|($type://)([^s]*)|ie “, $replace, $ret);}return $ret;}

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