欢迎交流!实现代码如下:
复制代码 代码如下:
/**
*Author:乌鸟heart
*实现长文章分页的代码
*原理:
*利用一个数组来记录文章每一页(用p0、p1、p2...做手动标记)的起始字节数,然后通过利用php函数操作这个数组去显示分页后的文章。分页显示,传递ptag(与tag的值一样)值。
*利用到的php函数:
*1、strlen("字符串") - Returns the length of the given string. - 返回字符串的字节总数。
*2、strpos("字符串","匹配字符") - Returns the numeric position of the first occurrence of needle in the haystack string. - 返回字符串中出现的第一个相匹配的字符所在的字节序数。
*3、substr("字符串","起始位置","终止位置") - substr() returns the portion of string specified by the start and length parameters. - 返回字符串中指定起止位置的若干字符。
*/
$sql = "select * from article where id = 41";//定义sql语句,返回id为41的内容
$result = mysql_query($sql);//执行sql语句,返回结果集
$row = mysql_fetch_array($result);//以数组的形式从记录集返回
$content = $row['content'];//把文章赋给变量$content
$articleCounts = strlen($content);//返回$content(文章)的总字节数
$isTrue = true;//循环标记
$tag = 0;//分页标记、数组下标
echo "字节总数:".$articleCounts."
";//测试信息
//寻找标记“ptag”,并把其位置(所在的字节数)赋给数组array[]------------------------------------------
while($isTrue){
$startAt = strpos($content,"p".$tag);//得到相应ptag的字节序数
if($startAt != false){ //如果有标记(返回值不是false),则记录位置
$array[$tag++] = $startAt;
}else{ //如果没有标记,则将数组array[0]赋值'\0'
$array[$tag] = '\0';
$isTrue = false;
}
}
//循环输出标记位置-------------------------------------------------------------测试信息
for($i = 0; $i echo $array[$i]."
";
}
echo "------------------------------
";
//输出内容---------------------------------------------------------------------
if($array[0] == '\0'){ //判断是否有标记
echo $content; //没有标记的情况,单页显示
}else{ //有标记的情况,分页显示
//输出分页内容
if( isset($_GET['ptag']) ){ //判断是否有ptag值传递,有则显示第 ptag+1 页,否则显示第一页(ptag=0)
$ptag = $_GET['ptag']; //把ptag的值赋给变量$ptag
if($ptag echo "有值传递,显示第".($ptag+1)."页
"; //测试信息
echo "值为:".$ptag."
"; //测试信息
echo substr($content,$array[$ptag - 1] + 2,$array[$ptag] - $array[$ptag - 1] - 2);//显示ptag+1页的内容
}else{echo "参数有误";}
}
else{ //没有ptag值传递的情况,显示第一页(ptag=0)
echo "无值传递,显示第1页
"; //测试信息
echo substr($content,0,$array[0] - 1);//显示第一页的内容
}
}
//循环显示页数链接-------------------------------------------------------------
if($array[0] != '\0'){ //在有手动标记的情况下才显示页数链接
for($i = 0;$i if($ptag == $i){ //如果是本页,则粗体显示
$pager .= " ".($i+1)." ";
}else{ //不是本页
$pager .= " ".($i+1)." ";
}
}
echo "
跳转至第".$pager."页"; //输出链接
}
?>

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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