The original intention of the design is: article list page. If you use strip_tags to delete all styles, the article introduction on the homepage will look messy and have no style. If you simply use strip_tags to retain p or br, then p or br will be truncated when you intercept the string.
The design idea is: keep p and br, then replace p with br; then use br as the separator to separate the entire article.
The specific code is as follows: you can use it directly
/** * 长文章分段 * @param string $article 文章内容 * @param number $return_number 文章字节限制 * @return array */ private function ContentAddpage($content,$return_number=800){ $return_content = ""; //返回的字符串 $current_num = 0; //当前字符串长度 $return_content_num = 0; //上次字符串截取后的长度;用来处理最后数组中字数过长的case. $page_num_word = array();//以br为分隔符使用preg_split分隔字符串生成的数组; $content = strip_tags($content,'<p>,<br>'); $content = preg_replace("/<p(.*?)>/m", "<br>", $content); $content = str_replace("</p>","", $content); $content = preg_replace("/<br(.*?)>/m", "<br>", $content); $content_info = preg_split("/\<br\>/",$content);//根据字符串确定段落 $art_num = count($content_info);//确定段落数 for($i=0;$i <= $art_num-1;$i++){ $page_num_word[$i] = strlen($content_info[$i]); $current_num += $page_num_word[$i];//得到字数 if ($current_num <= $return_number){ $tmp_num = $return_number-$current_num; $return_content .= mb_substr($content_info[$i],0,$tmp_num)."<br>"; $return_content_num = $current_num; }else{ $tmp_num = $return_number-$return_content_num; $return_content .= mb_substr($content_info[$i],0,$tmp_num)."<br>"; break; } } return $return_content; }

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。

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。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

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。

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。


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