<?php
//alert提示
function alert($msg){
echo "<script>alert('$msg');</script>";
}
//把一些預(yù)定義的字符轉(zhuǎn)換為 HTML 實(shí)體
function d_htmlspecialchars($string) {
if(is_array($string)) {
foreach($string as $key => $val) {
$string[$key] = d_htmlspecialchars($val);
}
} else {
$string = str_replace('&', '&amp;', $string);
$string = str_replace('"', '&quot;', $string);
$string = str_replace(''', '&#039;', $string);
$string = str_replace('<', '&lt;', $string);
$string = str_replace('>', '&gt;', $string);
$string = preg_replace('/&amp;(#\d;)/', '&\1', $string);
}
return $string;
}
//在預(yù)定義字符前加上反斜杠，包括 單引號(hào)、雙引號(hào)、反斜杠、NULL，以保護(hù)數(shù)據(jù)庫(kù)安全
function d_addslashes($string, $force = 0) {
if(!$GLOBALS['magic_quotes_gpc'] || $force) {
if(is_array($string)) {
foreach($string as $key => $val) $string[$key] = d_addslashes($val, $force);
}
else $string = addslashes($string);
}
return $string;
}
//生成隨機(jī)字符串，包含大寫、小寫字母、數(shù)字
function randstr($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 $hash;
}
//轉(zhuǎn)換時(shí)間戳為常用的日期格式
function trans_time($timestamp){
if($timestamp < 1) echo '無(wú)效的Unix時(shí)間戳';
else return date("Y-m-d H:i:s",$timestamp);
}
//獲取IP
function get_ip() {
if ($_SERVER["HTTP_X_FORWARDED_FOR"])
$ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
else if ($_SERVER["HTTP_CLIENT_IP"])
$ip = $_SERVER["HTTP_CLIENT_IP"];
else if ($_SERVER["REMOTE_ADDR"])
$ip = $_SERVER["REMOTE_ADDR"];
else if (getenv("HTTP_X_FORWARDED_FOR"))
$ip = getenv("HTTP_X_FORWARDED_FOR");
else if (getenv("HTTP_CLIENT_IP"))
$ip = getenv("HTTP_CLIENT_IP");
else if (getenv("REMOTE_ADDR"))
$ip = getenv("REMOTE_ADDR");
else
$ip = "Unknown";
return $ip;
}
//計(jì)算時(shí)間差：默認(rèn)返回類型為“分鐘”
//$old_time 只能是時(shí)間戳，$return_type 為 h 是小時(shí)，為 s 是秒
function timelag($old_time,$return_type='m'){
if($old_time < 1){
echo '無(wú)效的Unix時(shí)間戳';
}else{
switch($return_type){
case 'h':
$type = 3600; break;
case 'm':
$type = 60; break;
case 's':
$type = 1; break;
case '':
$type = 60; break;
}
$dif = round( (time()-$old_time)/$type ) ;
return $dif;
}
}
//獲取當(dāng)前頁(yè)面的URL地址
function url_this(){
$url = "http://".$_SERVER ["HTTP_HOST"].$_SERVER["REQUEST_URI"];
$return_url = "<a href='$url'>$url</a>";
return $return_url;
}
//跳轉(zhuǎn)函數(shù)
function url_redirect($url,$delay=''){
if($delay == ''){
echo "<script>window.location.href='$url'</script>";
}else{
echo "<meta http-equiv='refresh' content='$delay;URL=$url' />";
}
}
} //end func

?>