Common PHP tips and php tips

Common PHP skills and php skills. Summary of common PHP skills. php summary this article shares several common php skills for your reference. the specific content is as follows: 1. a summary of common PHP skills for reading a function file from a PHP file, php summary

This article shares several 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;}

The above is all of the content in this article. I hope you will like it if you are familiar with php skills.

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This article shares several common php skills for your reference. the specific content is as follows: 1. php file reading function: PHP_Re...