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常用的PHP方法集合
十二个常用的PHP方法，有PHP产生随机字符串函数，截取一定长度的字符串，取得客户端IP地址，判断邮箱地址，分页（两个函数配合使用），获得当前的脚本网址，把全角数字转为半角数字，去除HTML标记，相对路径转化成绝对路径，取得所有链接，HTML表格的每行转为CSV格式数组，将HTML表格的每行每列转为数组，采集表格数据等方法，感觉还是比较实用的，用到时，直接拿来就行了，太适合像我这样的懒人了！
产生随机字符串函数
<?
function random($length) {
$hash = @#@#;
$chars = @#ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789
abcdefghijklmnopqrstuvwxyz@#;
$max = strlen($chars) - 1;
mt_srand((double)microtime() * 1000000);
for($i = 0; $i < $length; $i++) { //OsPHP.COM.CN
$hash .= $chars[mt_rand(0, $max)];
}
return $hash;
} ?>
截取一定长度的字符串（该函数对GB2312使用有效）
<?
function Wordscut($string, $length ,$sss=0) { strl
en($string) > $length) {
if($sss){
$length=$length - 3;
$addstr=@# ...@#;
if(}
for($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;
}?>
取得客户端IP地址
<?
function GetIP(){
if (getenv("HTTP_CLIENT_IP") && strcasec
mp(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");
getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR")
, "unknown"))
$ip = getenv("REMOTE_ADDR");
else if (isset($_SERVER[@#REMOTE_ADDR@#]) &&
$_SERVER[@#REMOTE_ADDR@#] && strcasecmp($_SERVER[@#REMOT
E_ADDR@#], "unknown")) $ip = $_SERVER[@#REMOTE_ADDR@#];
else
$ip = "unknown";
return($ip);
}?>
判断邮箱地址
<?
function checkEmail($inAddress)
{
return (ereg("^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z
0-9_-])+",$inAddress));
} ?>
分页（两个函数配合使用）
<?
function getpage($sql,$page_size=20)
{
global $page,$totalpage,$sums;
$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."color=@#red@#><b>".$totalpage."
</b></font>页 ";
$linkNum =4;
$start = ($page-round($linkNum/2))>0 ? ($page-round($lin
kNum/2)) : "1"; $end = ($page+round($linkNum/2))<$totalpag
e ? ($page+round($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==$t) ? "<font [".$t."]color=@#red@#><b>
[".$t."]</b></font> " : "<a $thref=@#?page=$t&&".$string."@#>
$t</a> "; $end<$totalpage)
$out.="<a href=@#?page=".$nextend."&&".$string."@# title=下一页
>>>..</a>";
if($page<>$totalpage)
$out .= " <a href=@#?page=".$totalpage."&&".$string."@# tit
le=最后页>最后页</a>"; //开源代码OSPhP.COm.CN
return $out;
}?>
获得当前的脚本网址
<?
function get_php_url(){
if(!emptyempty($_server["REQUEST_URI"])){ //oSPHP.COM.CN
$scriptName = $_SERVER["REQUEST_URI"];
$nowurl = $scriptName;
}else{
$scriptName = $_SERVER["PHP_SELF"]; $_SERVER["Q
UERY_STRING"])) $nowurl = $scriptName;
else $nowurl = $scriptName."?".$_SERVER["QUERY_
STRING"];
} $nowurl;
}?>
把全角数字转为半角数字
<?
function GetAlabNum($fnum){
$nums = array("０","１","２","３","４","５","６","７"
,"８","９"); $fnums = "0123456789";
for($i=0;$i<=9;$i++) $fnum = str_replace($nums[$i]
,$fnums[$i],$fnum);
$fnum = ereg_replace("[^0-9.]|^0{1,}","",$fnum);
if($fnum=="") $fnum=0;
return $fnum;
}?>
去除HTML标记
<?
function Text2Html($txt){
$txt = str_replace(" "," ",$txt);
$txt = str_replace("<","<",$txt);
$txt = str_replace(">",">",$txt);
$txt = preg_replace("/[rn]{1,}/isU","
rn",$txt);
return $txt;
}?>
相对路径转化成绝对路径
<?
function relative_to_absolute($content, $feed_url) {
preg_match('/(http|https|ftp):///', $feed_url, $protocol);
$server_url = preg_replace("/(http|https|ftp|news):///",
"", $feed_url); //OSPHP.com.CN
$server_url = preg_replace("//.*/", "", $server_url);
if ($server_url == '') {
return $content;
}
if (isset($protocol[0])) {
$new_content = preg_replace('/href="//', 'href="'.$prot
ocol[0].$server_url.'/', $content);
$new_content = preg_replace('/src="//', 'src="'.$protoc
ol[0].$server_url.'/', $new_content); $new_content = $content;
}
return $new_content;
} ?>
取得所有链接
<?
function get_all_url($code){
preg_match_all('/<as+href=["|']?([^>"' ]+)["|']?s*[^>]*>
([^>]+)</a>/i',$code,$arr);
return array('name'=>$arr[2],'url'=>$arr[1]);
}?>
HTML表格的每行转为CSV格式数组
<?
function get_tr_array($table) { //PHP开源代码
$table = preg_replace("'<td[^>]*?>'si",'"',$table);
$table = str_replace("</td>",'",',$table);
$table = str_replace("</tr>","{tr}",$table); //去掉 HTML 标记
$table = preg_replace("'<[/!]*?[^<>]*?>'si","",$table);
//去掉空白字符
$table = preg_replace("'([rn])▼+'","",$table);
$table = str_replace(" ","",$table);
$table = str_replace(" ","",$table);
$table = explode(",{tr}",$table); array_pop($table);
return $table;
}?>
将HTML表格的每行每列转为数组，采集表格数据
<?
function get_td_array($table) {
$table = preg_replace("'<table[^>]*?>'si","",$table);
$table = preg_replace("'<tr[^>]*?>'si","",$table);
$table = preg_replace("'<td[^>]*?>'si","",$table);
$table = str_replace("</tr>","{tr}",$table); $table =
str_replace("</td>","{td}",$table);
//去掉 HTML 标记
$table = preg_replace("'<[/!]*?[^<>]*?>'si","",$table);
//去掉空白字符
$table = preg_replace("'([rn])▼+'","",$table);
$table = str_replace(" ","",$table);
$table = str_replace(" ","",$table);
$table = explode('{tr}', $table);
array_pop($table);
foreach ($table as $key=>$tr) {
$td = explode('{td}', $tr);
array_pop($td);
$td_array[] = $td; $td_array; }?>