Summary of common PHP skills (with function code)_PHP tutorial

//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
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
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
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
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 $directory ok “;
}
?> >//Directory name legality detection
function isen($str){

?>


PHP paging function



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The code is as follows:


//Paging function
function splitlist($HALT,$LRLIST,$ECHOCNT,$paper,$table,$where,$page_id,$userid){

$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);
}
?>


PHP instructions for using paging functions

The following are some tips:

How does PHP determine the legality of the ip address
if(!strcmp (long2ip(sprintf(“%u”,ip2long($ip))),$ip)) echo “is ipn”;
——-
Email regularity judgment
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) == $network) echo “valid ip and maskn”;
?>
—-
How to set the PHP file download header output
header(“Content-type: application/x-download” );
header(“Content-Disposition: attachment; filename=$file_download_name;”);
header(“Accept-Ranges: bytes”);
header(“Content-Length: $download_size”) ;
echo 'xxx'
PHP uses header to output ftp download method and supports breakpoint resume download
An example:
header('Pragma: public');
header('Cache -Control: private');
header('Cache-Control: no-cache, must-revalidate');
header('Accept-Ranges: bytes');
header('Connection: close ');
header(“Content-Type: audio/mpeg”);
header(“Location:ftp://download:1bk3l4s3k9s2@232.2.22.22/2222/web technology development knowledge base/cn_web.rmvb ");
PHP regular matching Chinese
ereg("^[".chr(0xa1)."-".chr(0xff)."]+$", $str);
Batch replace text Hyperlink inside
function urlParse($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;
}