First of all, let me introduce, what is Infinitus classification?
Infinitus Classification To put it simply, a category can be divided into multiple subcategories, and then one subcategory can be divided into multiple other subcategories and so on indefinitely, just like Windows can create a new folder, and then in this You can create some folders in the folder, and you can also create some folders under the folder.
So how does PHP realize its infinite classification? How to list its various categories one by one? The code is as follows
<?php /** * 无限级分类 类 */ class Category{ /** * 返回一维数组 * @param [type] $cate 要递归的数组 * @param string $html 子级分类前要显示的缩进符号。默认 '─' * @param integer $pid 父级分类ID。默认为 0,表示顶级分类 * @param integer $level level级,配合 $html 显示足够的缩进。默认为 1,表示顶级分类 * @return [type] [description] */ static public function unlimitedForLevel($cate, $html = '─', $pid = 0, $level = 1){ $arr = array(); foreach($cate as $v){ if($v['pid'] == $pid){ $v['level'] = $level; $v['html'] = str_repeat($html, $level - 1); $arr[] = $v; $arr = array_merge($arr, $this->unlimitedForLevel($cate, $html, $v['id'], $level + 1)); } } return $arr; } /** * 返回多维数组 * @param [type] $cate 要递归的数组 * @param string $name 子级分类在父分类数组中的 key * @param integer $pid 父级分类ID。默认为0,表示顶级分类 * @return [type] [description] */ static public function unlimitedForlayer($cate, $name = 'child', $pid = 0){ $arr = array(); foreach($cate as $v){ if( $v['pid'] == $pid){ $v[$name] = self::unlimitedForlayer($cate, $name, $v['id']); $arr[] = $v; } } return $arr; } /** * 传递子分类ID返回所有父级分类 * @param [type] $cate 要递归的数组 * @param [type] $id 子分类ID * @return [type] [description] */ static public function getParents($cate, $id){ $arr = array(); foreach($cate as $v){ if($v['id'] == $id){ $arr[] = $v; $arr = array_merge(self::getParents($cate, $v['pid']), $arr); } } return $arr; } /** * 传递父级分类ID返回所有子分类ID * @param [type] $cate 要递归的数组 * @param [type] $pid 父级分类ID * @return [type] [description] */ static public function getChildrenId($cate, $pid){ $arr = array(); foreach($cate as $v){ if($v['pid'] == $pid){ $arr[] = $v['id']; $arr = array_merge($arr, self::getChildrenId($cate, $v['id'])); } } return $arr; } /** * 传递父级分类ID返回所有子级分类 * @param [type] $cate 要递归的数组 * @param [type] $pid 父级分类ID * @return [type] [description] */ static public function getChildren($cate, $pid){ $arr = array(); foreach($cate as $v){ if($v['pid'] == $pid){ $arr[] = $v; $arr = array_merge($arr, self::getChildren($cate, $v['id'])); } } return $arr; } } ?>
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($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。

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。

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。

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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