PHP常用函數推薦
這是一些使用頻率比較高的函數，有的來自別人的程序......
1.產生隨機字符串函數
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='http://www.hdgsjgj.cn/templates/style.css' type=text/css rel=stylesheet>'; $html .='</head><body><br><br><br><br>'; $html .='<table cellspacing='0' cellpadding='0' border='1' align='center'>';$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>';$html .='<tr class='line_1'><td height='60'>';$html .='<br>'.$message.'<br><br>'; if (!empty($url)) $html .='系統將在3秒后返回<br>如果您的瀏覽器不能自動返回,請點擊[<a href='http://www.hdgsjgj.cn/bcjs/.$url.' target=_self>這里</a>]進入'; else $html .='[<a href='http://www.hdgsjgj.cn/bcjs/21964.html#' 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 '; $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='http://www.hdgsjgj.cn/bcjs/?page=1&&'.$string.''title=第一頁>第一頁</a> '; if($start>1)$out.='<a href='http://www.hdgsjgj.cn/bcjs/?page='.$prestart.'' title=>..<<</a> ';for($t=$start;$t<=$end;$t++) { $out .= ($page==$t) ? '<font color='red'><b>['.$t.']</b></font> ' : '<a href='http://www.hdgsjgj.cn/bcjs/?page=$t&&'.$string.''>$t</a> '; }if($end<$totalpage)$out.='<a href='http://www.hdgsjgj.cn/bcjs/?page='.$nextend.'&&'.$string.'' title=>>>..</a>'; if($page<>$totalpage) $out .= ' <a href='http://www.hdgsjgj.cn/bcjs/?page='.$totalpage.'&&'.$string.'' title=最后頁>最后頁</a>'; return $out;}
?>
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