PHP common function libraries and some practical tips_PHP tutorial

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 $buf;
}
? >
File writing function
//File writing function
function PHP_Write($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;
}
?>
Specify condition information quantity retrieval function
//Specify condition Information quantity retrieval function
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 $directory ok ";
}
?>
Directory name legality detection function
//Directory name legality detection
function isen($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("Does not meet specification!");
}
$ret.=chr($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 published in this edition!");
}
$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);
}
?>
Instructions on the use of paging functions
/*
#### Retrieval of paging functions####
Int $HALT - Retrieval Whether to display the page number bar (1/0) when the results are only divided into 1 page
Int $LRLIST - (the page number bar displays the page number-1)/2
Int $ECHOCNT - the number of records displayed on each page during retrieval
Int $paper - page number, pre-fetched: $paper=$HTTP_GET_VARS[paper];
Varchar $table - data table name, pre-attached value: $table="db.table";
Varchar $where - Retrieval conditions, pre-attached value: $where="where field='value'";
Varchar $enwhere - Encode the original $where twice with base64_encode() and submit it in the form of GET
Varchar $splitstr - The page number bar outputs a string, and after executing the function, execute echo at the corresponding position $splitstr;
Variables need to be obtained before the function is called -
$paper=$HTTP_GET_VARS[paper];
$sumcnt=$ HTTP_GET_VARS[sumcnt];
$enwhere=$HTTP_GET_VARS[enwhere];
Return (Varchar $where) - the search conditions for the search statement after paging
Note: This function needs to 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) {
//$TimeLimit=60; //Set the timeout limit and the default time is 30 seconds. When set to 0, it is unlimited
//set_time_limit($TimeLimit);
if(($UploadFile! = "none" )&&($UploadFile != "" )){
$FileName=$UploadPath.$UploadFile_name;
if($UploadFile_size <1024){
$FileSize="(string) $UploadFile_size" . "Bytes";
}elseif($UploadFile_size <(1024 * $max_size)){
$FileSize=number_format((double)($UploadFile_size / 1024), 1) . " KB ";
}else{
nerror("File exceeds limit size!");
}
//{
//$FileSize="number_format((double)($UploadFile_size" / (1024 * 1024)), 1) . " MB";
// }
if(!file_exists($FileName)){
if(copy($UploadFile,$FileName)){
return "$UploadFile_name ($FileSize)";
}else{
nerror("File $UploadFile_name failed to upload!");
}
unlink($UploadFile);
} else{
nerror("File $UploadFile_name already exists!");
}
//set_time_limit(30); //Restore the default timeout setting
}
}
The following Here are some tips:
How to determine the legality of an ip address
if(!strcmp(long2ip(sprintf("%u",ip2long($ip))),$ip)) echo "is ipn";
----
Regular judgment of email
eregi("^[_.0-9a-zA-Z-]+@([0- 9a-zA-Z][0-9a-zA-Z_-]+.)+[a-zA-Z]$", $email);
Example of checking whether the IP address and mask are legal
$ ip = '192.168.0.84';
$mask = '255.255.255.0';
$network = '192.168.0';
$ip = ip2long($ip);
$mask = ip2long($mask);
$network = ip2long($network);
if( ($ip & $mask) == $network) echo "valid ip and maskn";
?>
----
How to set the file download header output
header("Content-type: application/x-download");
header("Content-Disposition : attachment; filename=$file_download_name;");
header("Accept-Ranges: bytes");
header("Content-Length: $download_size");
echo 'xxx'
Use header to output ftp download method, and support breakpoint resume download
An example:
header('Pragma: public');
header('Cache-Control: private') ;
header('Cache-Control: no-cache, must-revalidate');
header('Accept-Ranges: bytes');
header('Connection: close');
header("Content-Type: audio/mpeg");
header("Location:ftp://download:1bk3l4s3k9s2@232.2.22.22/2222/web technology development knowledge base/cn_web.rmvb");
Regular match Chinese
ereg("^[".chr(0xa1)."-".chr(0xff)."]+$", $str);
Batch Replace hyperlinks in text
function urlParse($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;
}