//截取字符串
mb_substr($str,star,count,encode);
//获取字符串长度
mb_strlen();
//完整保留在textarea文本中的回车换行
str_replace(chr(10),"<br />",$textarea);
//根据ascii返回相应的字母
echo "ascii为66的字母是:". chr(66)."<br>";
//chop 去除字符串中的连续空格和空白
$str=" he llo wo rd ";echo "s:";
echo "s:".chop($str)."w";
//explode 按照某个字符分割字符串 返回数组
$str="green,red,yellow,white";
$arr=explode(" ",$str);echo "分割后的数组是:";
print_r($arr);
//implode 将数组按照某个字符拼成字符串
$arr=array("a","b","c","d");
$str=implode('/',$arr);
echo "<br>拼成的字符串是:".$str;
//打印print
print("打印的方法print");
echo "格式化打印printf:<br>";
printf("%f%",2,"d");
//不区分大小写比较字符串
echo "不区分大小写:".strcasecmp("hello word","hello word");
//区分大小写
echo "区分大小写:". strcmp("hello word","hello word");
//查找字符串
echo "查找的结果是:". strchr("hello word","hello");
//字符串长度
echo "str长度:".strlen("hello word");
//将字符串重复几次str_repeat
echo "将字符串重复几次:".str_repeat("ws",3);
//将字符串倒序排列
echo "zifuchuandaoxu:".strrev("zifuchuandaoxu");
//将字符串大写，小写转化
//strtolower();
//strtoupper();
//字符串替换,
echo "替换后的字符串是:". str_replace("b","*","aaaaabbbbbccccc");
//切割字符串
echo "切割后的字符串是:". substr("hello word",2,3);
这是一款非常简单的php mysql用户登录代码，适合初学者,希望本文章对各位同学会带来帮助。
| 代码如下 |
复制代码 |
|
error_reporting(0);
$mysql_servername = "localhost";
$mysql_username = "root";
$mysql_password ="";
$mysql_database ="peng";
mysql_connect($mysql_servername , $mysql_username , $mysql_password);
mysql_select_db($mysql_database);
$name=$_post['name'];
$passowrd=$_post['password'];
if ($name && $passowrd){
$sql = "select * from liuyanban where name = '$name' and password='$passowrd'";
$res = mysql_query($sql);
$rows=mysql_num_rows($res);
if($rows){
header("refresh:0;url=a.htm");
exit;
}
echo "<script language=网页特效>alert('用户名密码错误');history.back();</script>";
}else {
echo "<script language=javascript>alert('用户名密码不能为空');history.back();</script>";
}
?>
以下login.htm内容
<html>
<body>
<form name="login" action="login.php" method=post>
用户名<input type=text name="name">
<p>密码<input type=password name="password">
<p>
<input name="log" type=submit value="登录">
</form>
</body>
</html>
|
本文章提供这三款php 截取字符串函数各有各的特点，所有字符串截取函数都支持中文汉字截取，解决了乱码问题，方法二，支持多种编码的截取。
//字符串截取函数一
| 代码如下 |
复制代码 |
|
function mystr($str,$str_len) {//剪取一定长度的字符串(字符串,剪取长度)
if (strlen($str)<=$str_len) {
return $str;
}else return mysubstr($str,0,$str_len)."...";
}
function mysubstr($str, $start, $len) {//剪取一定长度的字符串(字符串,剪取长度)
$tmps教程tr = "";
$strlen = $start + $len;
for($i = 0; $i < $strlen; $i++) {
if(ord(substr($str, $i, 1)) > 0xa0) {
$tmpstr .= substr($str, $i, 2);
$i++;
} else
$tmpstr .= substr($str, $i, 1);
}
return $tmpstr;
}
|
//字符截取函数二
| 代码如下 |
复制代码 |
|
function syssubstr($string,$length,$append = false)
{
if (strlen($string) < = $length )
{
return $string;
}
else
{
$i = 0;
while ($i < $length)
{
$stringtmp = substr($string,$i,1);
if ( ord($stringtmp) >=224 )
{
$stringtmp = substr($string,$i,3);
$i = $i + 3;
}
elseif( ord($stringtmp) >=192 )
{
$stringtmp = substr($string,$i,2);
$i = $i + 2;
}
else
{
$i = $i + 1;
}
$stringlast[] = $stringtmp;
}
$stringlast = implode("",$stringlast);
if($append)
{
$stringlast .= "...";
}
return $stringlast;
}
}
$string = "";
$length = "18";
$append = false;
echo syssubstr($string,$length,$append);
|
// utf-8:$byte=3 | gb 2312:$byte=2 | big5:$byte=2
| 代码如下 |
复制代码 |
|
function bite_str($string, $start, $len, $byte=3)
{
$str = "";
$count = 1;
$str_len = strlen($string);
for ($i=0; $i<$str_len; $i++) {
if (($count+1-$start)>$len) {
$str .= "...";
break;
} elseif ((ord(substr($string,$i,1)) <= 128) && ($count < $start)) {
$count++;
} elseif ((ord(substr($string,$i,1)) > 128) && ($count < $start)) {
$count = $count+2;
$i = $i+$byte-1;
} elseif ((ord(substr($string,$i,1)) <= 128) && ($count >= $start)) {
$str .= substr($string,$i,1);
$count++;
} elseif ((ord(substr($string,$i,1)) > 128) && ($count >= $start)) {
$str .= substr($string,$i,$byte);
$count = $count+2;
$i = $i+$byte-1;
}
}
return $str;
}
// test
$str = "1测试测试2测试测试3测试测试4测试测试";
echo $str;
echo "<br>".bite_str($str,0,20,2);//0为开始地址,20为结束地址2为类型上面说到的
|
//方法四，支持中英文字符串截取函数
| 代码如下 |
复制代码 |
|
function ccstrlen(＄str) #计算中英文混合字符串的长度
{
＄cclen=0;
＄asclen=strlen(＄str);
＄ind=0;
＄hascc=ereg("[xa1-xfe]",＄str); #判断是否有汉字
＄hasasc=ereg("[x01-xa0]",＄str); #判断是否有ascii字符
if(＄hascc && !＄hasasc) #只有汉字的情况
return strlen(＄str)/2;
if(!＄hascc && ＄hasasc) #只有ascii字符的情况
return strlen(＄str);
for(＄ind=0;＄ind<＄asclen;＄ind++)
{
if(ord(substr(＄str,＄ind,1))>0xa0)
{
＄cclen++;
＄ind++;
}
else
{
＄cclen++;
}
}
return ＄cclen;
}
|
| 代码如下 |
复制代码 |
|
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>php教程 ajax分页程序代码</title>
<script language="网页特效" type="text/javascript">
function $()
{
var elements = new array();
for (var i = 0; i < arguments.length; i++)
{
var element = arguments[i];
if (typeof element == 'string')
element = document.getelementbyid(element);
if (arguments.length == 1)
return element;
elements.push(element);
}
return elements;
}
var xmlhttp
function pagination(page)
{
xmlhttp=getxmlhttpobject();
if (xmlhttp==null)
{
alert ("your browser does not support ajax!");
return;
}
var url="server.php";
url = url+"?starting="+page;
url=url+"&sid="+math.random();
xmlhttp.onreadystatechange=statechanged;
xmlhttp.open("get",url,true);
xmlhttp.send(null);
}
function statechanged()
{
/****
0 － （未初始化）还没有调用send()方法
1 － （载入）已调用send()方法，正在发送请求
2 － （载入完成）send()方法执行完成，已经接收到全部响应内容
3 － （交互）正在解析响应内容
4 － （完成）响应内容解析完成，可以在客户端调用了
***/
if (xmlhttp.readystate==4)
{
$("page_contents").innerhtml=xmlhttp.responsetext;
}
}
function getxmlhttpobject()
{
var xmlhttp=null;
try
{
// firefox, opera 8.0+, safari
xmlhttp=new xmlhttprequest();
}
catch (e)
{
// internet explorer
try
{
xmlhttp=new activexobject("msxml2.xmlhttp");
}
catch (e)
{
xmlhttp=new activexobject("microsoft.xmlhttp");
}
}
return xmlhttp;
}
</script>
<link rel="stylesheet" type="text/css教程" href="style.css" />
</head>
<body>
<div id="page_contents">
|
| 代码如下 |
复制代码 |
function pagenavi($total, $offset){
global $conf_pagemax;
global $conf_home;
global $conf_pastlog;
global $view;
$next = $offset + $conf_pagemax;
$prev = $offset - $conf_pagemax;
echo " <!-- page navigation --> ";
if($offset > $conf_pagemax-1){
echo "<a href="index.php?offset=$prev";
if($view == "past"){
echo "&view=past";
}
echo ""><<上一页</a> ";
}
($total % $pagemax)? $pagenum = ($total/$conf_pagemax) + 1: $pagenum = ($total/$conf_pagemax);
if($total <= $conf_pagemax) $pagenum = 0;
$c = 0;
$page = 1;
if($total > $conf_pagemax){
echo "[<b> ";
while($pagenum > 0){
if($offset == $c){
$str .= " $page ";
} else {
$str .= " <a href="index.php?offset=$c";
if($view =="past"){
$str .= "&view=past";
}
$str .= "">$page</a> ";
}
$page++;
$pagenum--;
$c = $c + $conf_pagemax;
}
echo "$str </b>] ";
}
if($next < $total){
echo "<a href="index.php?offset=$next";
if ($view == "past"){
echo "&view=past";
}
echo "">下一页>></a> ";
}
echo "</td></tr></table>";
echo " <!-- end of page navigation --> <br><br>";
echo "
[ <a href="$conf_home">返回主页</a> ]
";
if($view != "past"){
if(file($conf_pastlog)){
echo "[ <a href="index.php?view=past">以前的留言</a> ]";
}
}
echo " [ <a href="search.php"> 搜索</a> ] ";
echo " [ <a href="index.php">留言板首页</a> ] ";
} |
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