PHP-常用代码片段

最新推荐文章于 2025-12-27 11:46:02 发布

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#date #string #html #function #stylesheet #server

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这是一些使用频率比较高的函数......

1.产生随机字符串函数

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.截取一定长度的字符串

注：该函数对GB2312使用有效

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.取得客户端IP地址

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.创建相应的文件夹

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.判断邮箱地址

function checkEmail($inAddress)

{

return (ereg("^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+",$inAddress));

}

6.跳转

function gotourl($message=@#@#,$url=@#@#,$title=@#@#)

{

$html ="<html><head>";

if(!empty($url))

$html .="<meta http-equiv=@#refresh@# content="3;url=@#".$url."@#">";

$html .="<link href=@#../templates/style.css@# type=text/css rel=stylesheet>";

$html .="</head><body><br><br><br><br>";

$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 .="<tr class=@#line_1@#><td align=@#center@# height=@#60@#>";

$html .="<br>".$message."<br><br>";

if (!empty($url))

$html .="系统将在3秒后返回<br>如果您的浏览器不能自动返回,请点击[<a href=".$url." target=_self>这里</a>]进入";

else

$html .="[<a href=@##@# onclick=@#history.go(-1)@#>返回</a>]";

$html .="</td></tr></table></td></tr></table>";

$html .="</body></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;

$out="共<font color=@#red@#><b>".$totalpage."</b></font>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)

$out .= "<a href=@#?page=1&&".$string."@#title=第一页>第一页</a> ";

if($start>1)

$out.="<a href=@#?page=".$prestart."@# title=上一页>..<<</a> ";

for($t=$start;$t<=$end;$t++)

{

$out .= ($page==$t) ? "<font color=@#red@#><b>[".$t."]</b></font> " : "<a href=@#?page=$t&&".$string."@#>$t</a> ";

}

if($end<$totalpage)

$out.="<a href=@#?page=".$nextend."&&".$string."@# title=下一页>>>..</a>";

if($page<>$totalpage)

$out .= " <a href=@#?page=".$totalpage."&&".$string."@# title=最后页>最后页</a>";

return $out;

}

8.获取新插入数据的ID

mysql_insert_id();

9.怎么获得某个月的最后一天

$lastday = mktime (0,0,0,9,0,2006);

echo strftime ("2006年8月最后一天是: %d", $lastday);

echo "<BR>";

$lastday = mktime (0,0,0,10,0,2006);

echo strftime ("2006年9月最后一天是: %d", $lastday);

echo "<BR>";

10.算当前礼拜的日期函数(从xx日到xx日为当前礼拜)

<?php

function weekdate($today)

{

$today_form = date("Y-m-d", strtotime("today"));

switch ($today)

{

case "Sunday":

$monday = date("Y-m-d", strtotime("today")-518400);

$sunday = $today_form ;

break;

case "Monday":

$monday = $today_form ;

$sunday = date("Y-m-d", strtotime("today")+518400);

break;

case "Tuesday":

$monday = date("Y-m-d", strtotime("today")-86400);

$sunday = date("Y-m-d", strtotime("today")+432000);

break;

case "Wednesday":

$monday = date("Y-m-d", strtotime("today")-172800);

$sunday = date("Y-m-d", strtotime("today")+345600);

break;

case "Thursday":

$monday = date("Y-m-d", strtotime("today")-259200);

$sunday = date("Y-m-d", strtotime("today")+259200);

break;

case "Friday":

$monday = date("Y-m-d", strtotime("today")-345600);

$sunday = date("Y-m-d", strtotime("today")+172800);

break;

case "Saturday":

$monday = date("Y-m-d", strtotime("today")-432000);

$sunday = date("Y-m-d", strtotime("today")+86400);

break;

}

return compact('monday','sunday');

}

$a = date ("l", time());

extract(weekdate($a));

echo $monday."----------".$sunday;

/*第二种方法*/

<?php

$monday = date("Y-m-d",mktime(0,0,0,date('m'),date('d')-date('w')+1,date('Y')));

$sunday = date("Y-m-d",mktime(0,0,0,date('m'),date('d')+7-date('w'),date('Y')));

echo $monday."----------".$sunday;