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一些使用頻率比較高的PHP函數

來源:互聯網  2008-12-18 07:52:48  評論

在php開發中,我們經常會遇到一些函數,下面是整理好的,可以直接使用,方便開發效率,不過建議大家一定要先看懂,然後在這個基礎上增加功能就提高了自身能力了

1.産生隨機字符串函數

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.截取一定長度的字符串

注:該函數對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.取得客戶端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.創建相應的文件夾

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.判斷郵箱地址

function checkemail($inaddress)

{

return (ereg("^([a-za-z0-9_-])+@([a-za-z0-9_-])+(\.[a-za-z0-9_-])+",$inaddress));

}

6.跳轉

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

{

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

if(!empty($url))

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

$html .="<[url=http://www.knowsky.com/@#../templates/style.css]linkhref=@#../templates/style.css@# type=text/css rel=stylesheet>";

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

$html .="<tablecellspacing=@#0@#cellpadding=@#0@#border=@#1@#width=@#450@#align=@#center@#>";

$html .="<tr><tdbgcolor=@##ffffff@#>";

$html .="<tableborder=@#1@#cellspacing=@#1@#cellpadding=@#4@#width=@#100%@#>";

$html .="<trclass=@#m_title@#>";

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

$html .="<trclass=@#line_1@#><tdalign=@#center@#height=@#60@#>";

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

if (!empty($url))

$html .="系統將在3秒後返回<br>如果您的浏覽器不能自動返回,請點擊[<a href=".$url." target=_self>這裏</a>]進入";

else

$html .="[<a [url=http://www.knowsky.com/@##@#=@#history.go(-1]href=@##@#=@#history.go(-1)@#>返回</a>]";

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

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

echo $html;

exit;

}

7.分頁(兩個函數配合使用)

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;

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

$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)

$out .= "<[url=http://www.knowsky.com/@#?page=1&&]ahref=@#?page=1&&".$string."@#title=第一頁>第一頁</a> ";

if($start>1)

$out.="<[url=http://www.knowsky.com/@#?page=]ahref=@#?page=".$prestart."@# title=上一頁>..<<</a> ";

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

{

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

}

if($end<$totalpage)

$out.="<[url=http://www.knowsky.com/@#?page=]ahref=@#?page=".$nextend."&&".$string."@# title=下一頁>>>..</a>";

if($page<>$totalpage)

$out .= " <[url=http://www.knowsky.com/@#?page=]ahref=@#?page=".$totalpage."&&".$string."@# title=最後頁>最後頁</a>";

return $out;

}

8.獲取新插入數據的id

<?

mysql_insert_id();

?>

本文來自: 腳本之家(www.jb51.net) 詳細出處參考:http://www.jb51.net/article/16071.htm

在php開發中,我們經常會遇到一些函數,下面是整理好的,可以直接使用,方便開發效率,不過建議大家一定要先看懂,然後在這個基礎上增加功能就提高了自身能力了 1.産生隨機字符串函數 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 $hash; } 2.截取一定長度的字符串 注:該函數對gb2312使用有效 function wordscut($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.取得客戶端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.創建相應的文件夾 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.判斷郵箱地址 function checkemail($inaddress) { return (ereg("^([a-za-z0-9_-])+@([a-za-z0-9_-])+(\.[a-za-z0-9_-])+",$inaddress)); } 6.跳轉 function gotourl([url=mailto:$message=@#@#,$url=@#@#,$title]$message=@#@#,$url=@#@#,$title[/url]=@#@#) { $html ="<html><head>"; if(!empty($url)) $html .="<[url=mailto:metahttp-equiv=@#refresh]metahttp-equiv=@#refresh[/url]@# content=\"3;url=@#".$url."@#\">"; $html .="<[url=mailto:link@#../templates/style.css][url=http://www.knowsky.com/@#../templates/style.css]linkhref=@#../templates/style.css[/url]@# type=text/css rel=stylesheet>"; $html .="</head><body><br><br><br><br>"; $html .="<[url=mailto:tablecellspacing=@#0@#cellpadding=@#0@#border=@#1@#width=@#450@#align=@#center]tablecellspacing=@#0@#cellpadding=@#0@#border=@#1@#width=@#450@#align=@#center[/url]@#>"; $html .="<tr><[url=mailto:tdbgcolor=@##ffffff]tdbgcolor=@##ffffff[/url]@#>"; $html .="<[url=mailto:tableborder=@#1@#cellspacing=@#1@#cellpadding=@#4@#width=@#100%]tableborder=@#1@#cellspacing=@#1@#cellpadding=@#4@#width=@#100%[/url]@#>"; $html .="<[url=mailto:trclass=@#m_title]trclass=@#m_title[/url]@#>"; $html .="<td>".$title."</td></tr>"; $html .="<[url=mailto:trclass=@#line_1@#]trclass=@#line_1@#><tdalign=@#center@#height=@#60[/url]@#>"; $html .="<br>".$message."<br><br>"; if (!empty($url)) $html .="系統將在3秒後返回<br>如果您的浏覽器不能自動返回,請點擊[<a href=".$url." target=_self>這裏</a>]進入"; else $html .="[<a [url=mailto:@##@#=@#history.go(-1][url=http://www.knowsky.com/@##@#=@#history.go(-1]href=@##@#=@#history.go(-1[/url])@#>返回</a>]"; $html .="</td></tr></table></td></tr></table>"; $html .="</body></html>"; echo $html; exit; } 7.分頁(兩個函數配合使用) function getpage($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; $out="共<font ".$totalpage."[url=mailto:color=@#red@#]".$totalpage."color=@#red@#><b>".$totalpage."</b></font[/url]>頁 "; $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) $out .= "<[url=mailto:a@#?page=1&&][url=http://www.knowsky.com/@#?page=1&&]ahref=@#?page=1&&".$string."@#title[/url]=第一頁>第一頁</a> "; if($start>1) $out.="<[url=mailto:a@#?page=][url=http://www.knowsky.com/@#?page=]ahref=@#?page=".$prestart[/url]."@# title=上一頁>..<<</a> "; for($t=$start;$t<=$end;$t++) { $out .= ($page==$t) ? "<font [".$t."]color=@#red@#><b>[".$t."]</b></font> " : "<[url=mailto:a$t@#?page=$t&&]$t[/url]a$thref=@#?page=$t&&".$string."@#>$t</a> "; } if($end<$totalpage) $out.="<[url=mailto:a@#?page=][url=http://www.knowsky.com/@#?page=]ahref=@#?page=".$nextend."&&".$string[/url]."@# title=下一頁>>>..</a>"; if($page<>$totalpage) $out .= " <[url=mailto:a@#?page=][url=http://www.knowsky.com/@#?page=]ahref=@#?page=".$totalpage."&&".$string[/url]."@# title=最後頁>最後頁</a>"; return $out; } 8.獲取新插入數據的id <? mysql_insert_id(); ?> 本文來自: 腳本之家([url=http://www.jb51.net]www.jb51.net[/url]) 詳細出處參考:[url=http://www.jb51.net/article/16071.htm]http://www.jb51.net/article/16071.htm[/url]
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