Home>Article>Backend Development> Some commonly used php functions_PHP tutorial

Some commonly used php functions_PHP tutorial

WBOY
WBOY Original
2016-07-21 15:59:20 1341browse

1. Generate 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"); _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 > >}
?>


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 .="





";
$html .="































".$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;
}

?>

www.bkjia.com true http://www.bkjia.com/PHPjc/317337.html TechArticle 1.产生随机字符串函数 ?php functionrandom($length){ $hash=''; $chars='ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz'; $max=strlen($chars)-1; mt_srand((doubl...
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
";$html .=" ";$html .="";echo $html;exit;}?>7.分页(两个函数配合使用) function getpage($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
";
$html .="


";$html .="< tr class='m_title'>";$html .=" ";$html .="< tr class='line_1'>
".$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 .="
>