Home  >  Article  >  Backend Development  >  http://www.hunanzhibo.com/ Some frequently used php functions

http://www.hunanzhibo.com/ Some frequently used php functions

WBOY
WBOYOriginal
2016-07-29 08:39:031439browse

1. Generate a random string function
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 string of a certain length
Note: This function is valid for gb2312
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) {
$wordscut .= $string[$i].$string[$i + 1];
$i++;
} else {
$wordscut .= $string[$i];
}
}
return $wordscut.$addstr;
}
return $string;
}
3. Get the 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 corresponding folder
function createdir($dir=@#@#)
{
if (!is_dir($dir))
{
$temp = explode(@#/@#,$dir);
$cur_dir = @#@#;
for($i=0;$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))
$html .="$html .="";
$html .="< /head>



";
$html .="

";
$html .="
";
$ html .="";
$html .="";
$html .="";
$html .="
".$title."
";
$html .="
".$message."
if (!empty($url))
$html .="The system will return in 3 seconds
If your browser cannot return automatically, please click [here]enter";
else
$html .="[ Return]";
$html .="
";
$html .="";
echo $html;
exit;
}
7. Pagination (two functions are used together)
function getpage($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;
$out="共".$totalpage."页 ";
$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)
$out .= "第一页 ";
if($start>1)
$out.="..<< ";
for($t=$start;$t<=$end;$t++)
{
$out .= ($page==$t) ? "[".$t."] " : "$t ";
}
if($end<$totalpage)
$out.=">>..";
if($page<>$totalpage)
$out .= " 最后页";
return $out;
}
8.获取新插入数据的id
mysql_insert_id();
?>

以上就介绍了http://www.hunanzhibo.com/ 一些使用频率比较高的php函数,包括了http://www.hunanzhibo.com/方面的内容,希望对PHP教程有兴趣的朋友有所帮助。

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn