Some very useful PHP functions that use a high frequency

1. Generating random String functions

function Random ($length) {
$hash = @#@#;
$chars = @ #ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz @#;
$max = strlen ($chars)-1;
Mt_srand (Double) microtime () * 1000000);
for ($i = 0; $i < $length; $i + +) {
$hash. = $chars [Mt_rand (0, $max)];
}
return $hash;
}

2. Intercept a certain length of string

Note: This function is valid for GB2312 use

function wordscut ($string, $length, $sss =0) {
 if (strlen ($string) > $length) {
                if ($sss) {
                       $ Length= $length-3;
                       $addstr =@# ... @#;
               }
  for ($i = 0; $i < $length; $i + +) {
   if (Ord ($string [$i]) > 127) {
    $wor Dscut. = $string [$i]. $string [$i + 1];
    $i + +;
  } else {
    $wordscut. = $string [$i];
  }
 }
  return $wordscut. $ADDSTR
&NBSP}
 return $string;
}

3. Obtain Client IP Address

function GetIP () {
if (getenv ("Http_client_ip") && strcasecmp (getenv ("Http_client_ip"), "Unknown")
$ip = getenv ("Http_client_ip");
else if (getenv ("Http_x_forwarded_for") && strcasecmp (getenv ("Http_x_forwarded_for"), "Unknown")
$ip = getenv ("Http_x_forwarded_for");
else if (getenv ("REMOTE_ADDR") && strcasecmp (getenv ("REMOTE_ADDR"), "Unknown")
$ip = getenv ("REMOTE_ADDR");
else if (isset ($_server[@ #REMOTE_ADDR @#]) && $_server[@ #REMOTE_ADDR @#] && strcasecmp ($_server[@# remote_addr@#], "unknown")
$ip = $_server[@ #REMOTE_ADDR @#];
Else
$ip = "Unknown";
return ($IP);
}

4. Create the appropriate folder

function Createdir ($dir =@#@#)
{
if (!is_dir ($dir))
{
$temp = Explode (@#/@#, $dir);
$cur _dir = @#@#;
for ($i =0; $i <count ($temp); $i + +)
{
$cur _dir. = $temp [$i].@#/@#;
if (!is_dir ($cur _dir))
{
@mkdir ($cur _dir,0777);
}
}
}
}

5. Determine the email address

function Checkemail ($inAddress)
{
Return (Ereg ("^ ([a-za-z0-9_-]) +@" ([a-za-z0-9_-]) + (\.[ A-za-z0-9_-]) + ", $inAddress));
}

6. Jump

function Gotourl ($message =@#@#, $url =@#@#, $title =@#@#)
{
$html = "if (!empty ($url))
$html. = "<meta http-equiv=@ #refresh @# content=\" 3;url=@# ". $url." @#\ ">";
$html. = "<link href=@#. /templates/style.css@# type=text/css rel=stylesheet> ";
$html. = "$html. = "<table cellspacing=@ #0 @# cellpadding=@ #0 @# border=@ #1 @# width=@ #450 @# align=@ #center @#>";
$html. = "<tr><td bgcolor=@# #ffffff @#>";
$html. = "<table border=@ #1 @# cellspacing=@ #1 @# cellpadding=@ #4 @# width=@ #100%@#>";
$html. = "<tr class=@ #m_title @#>";
$html. = "<td>". $title. " </td></tr> ";
$html. = "<trclass=@ #line_1 @#><td align=@ #center @# height=@ #60 @#> ";
$html. = "<br>". $message. " <br><br> ";
if (!empty ($url))
$html. = "System will return in 3 seconds <br> If your browser does not return automatically, please click [<a href=". $url. "Target=_self> here </a>] enter";
Else
$html. = "[<a href=@##@# onclick=@ #history. Go ( -1) @#> return </a>]";
$html. = "</td></tr></table></td></tr></table>";
$html. = "</body>Echo $html;
Exit
}

7. Paging (two functions used together)

function GetPage ($sql, $page _size=20)
{
Global $page, $totalpage, $sums; Out param
$page = $_get["page"];
$eachpage = $page _size;
$pagesql = Strstr ($sql, "from");
$pagesql = "SELECT count (*) as IDs". $pagesql;
$result = mysql_query ($pagesql);
if ($rs = mysql_fetch_array ($result)) $sums = $rs [0];
$totalpage = Ceil ($sums/$page _size);
if (! $page) | | ($page <1)) $page = 1;
$startpos = ($page-1) * $page _size;
$sql. = "Limit $startpos, $page _size";
return $sql;
}
function Showbar ($string = "")
{
Global $page, $totalpage;
$out = "Altogether <font". $totalpage. "". $totalpage."color=@ #red @#><b> ". $totalpage." </b></font> page ";
$linkNum = 4;
$start = ($page-round ($linkNum/2)) >0? ($page-round ($linkNum/2)): "1";
$end = ($page +round ($linkNum/2)) < $totalpage? ($page +round ($linkNum/2)): $totalpage;
$prestart = $start-1;
$nextend = $end +1;
if ($page <>1)
$out. = "<a href=@#?page=1&&". $string. " @ #title = First page > first page </a> ";
if ($start >1)
$out. = "<a href=@#?page=". $prestart. " @# title= Previous Page "... <<</a> ";
for ($t = $start; $t <= $end; $t + +)
{
$out. = ($page = = $t)? "<font [". $t. "] color=@ #red @#><b>[". $t."] </b></font> ":" <a $t$thref =@#?page= $t && ". $string." @#> $t </a> ";
}
if ($end < $totalpage)
$out. = "<a href=@#?page=". $nextend. " && ". $string." @# title= next page >>> </a> ";
if ($page <> $totalpage)
$out. = "<a href=@#?page=". $totalpage. " && ". $string." @# title= last page > last page </a> ";
return $out;
}

8. Get the ID of the newly inserted data

?
MYSQL_INSERT_ID ();
?>