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PHP常用函數推薦

來源:互聯網  2008-12-22 08:08:03  評論

這是一些使用頻率比較高的函數,有的來自別人的程序......

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='')

{

$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 href='#' onclick='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;

$out="共<font color='red'><b>".$totalpage."</b></font>頁&nbsp;&nbsp;";

$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=第一頁>第一頁</a>&nbsp;";

if($start>1)

$out.="<a href='?page=".$prestart."' title=>..<<</a>&nbsp;";

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

{

$out .= ($page==$t) ? "<font color='red'><b>[".$t."]</b></font>&nbsp;" : "<a href='?page=$t&&".$string."'>$t</a>&nbsp;";

}

if($end<$totalpage)

$out.="<a href='?page=".$nextend."&&".$string."' title=>>>..</a>";

if($page<>$totalpage)

$out .= "&nbsp;<a href='?page=".$totalpage."&&".$string."' title=最後頁>最後頁</a>";

return $out;

}

?>

這是一些使用頻率比較高的函數,有的來自別人的程序...... 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='') { $html ="<html><head>"; if(!empty($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 href='#' onclick='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; $out="共<font color='red'><b>".$totalpage."</b></font>頁&nbsp;&nbsp;"; $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=第一頁>第一頁</a>&nbsp;"; if($start>1) $out.="<a href='?page=".$prestart."' title=>..<<</a>&nbsp;"; for($t=$start;$t<=$end;$t++) { $out .= ($page==$t) ? "<font color='red'><b>[".$t."]</b></font>&nbsp;" : "<a href='?page=$t&&".$string."'>$t</a>&nbsp;"; } if($end<$totalpage) $out.="<a href='?page=".$nextend."&&".$string."' title=>>>..</a>"; if($page<>$totalpage) $out .= "&nbsp;<a href='?page=".$totalpage."&&".$string."' title=最後頁>最後頁</a>"; return $out; } ?>
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