


This article mainly introduces the method of PHP to implement two-dimensional array sorting by a certain column. It analyzes the skills of PHP two-dimensional array sorting in the form of examples. It involves the use of the array_multisort function. Friends who need it can refer to it
The details are as follows:
/* * 二维数组 按某列排序 * array_multisort($arr1,$arr2) * 手册 例子如下 * */ $data[] = array('volume' => 67, 'edition' => 2); $data[] = array('volume' => 86, 'edition' => 1); $data[] = array('volume' => 85, 'edition' => 6); $data[] = array('volume' => 98, 'edition' => 2); $data[] = array('volume' => 86, 'edition' => 6); $data[] = array('volume' => 67, 'edition' => 7); // 取得列的列表 foreach ($data as $key => $row) { $volume[$key] = $row['volume']; $edition[$key] = $row['edition']; } // 将数据根据 volume 降序排列,根据 edition 升序排列 // 把 $data 作为最后一个参数,以通用键排序 array_multisort($volume, SORT_DESC, $edition, SORT_ASC, $data); /*************************************/ /* 从上面的例子不难看出,array_multisort()函数 * 是将每一个二维数组的列作为 一个参数进行排序 * 来达到整个数组的排序 */ /*************************************/ function sigcol_arrsort($data,$col,$type=SORT_DESC){ if(is_array($data)){ $i=0; foreach($data as $k=>$v){ if(key_exists($col,$v)){ $arr[$i] = $v[$col]; $i++; }else{ continue; } } }else{ return false; } array_multisort($arr,$type,$data); return $data; } print_r(sigcol_arrsort($data,'edition',SORT_DESC)); /*说白了 原理就是: 新数组 原二维数组 2 array('volume' => 67, 'edition' => 2); 1 array('volume' => 86, 'edition' => 1); 6 array('volume' => 85, 'edition' => 6); 2 array('volume' => 98, 'edition' => 2); 6 array('volume' => 86, 'edition' => 6); 7 array('volume' => 67, 'edition' => 7); 这两个数组的每一行都锁在一起,新数组一旦变动顺序, 那么就会连带每一行的二维数组也跟着变换顺序 ,即新数组为参照物 相当于查询子句中的 order by */
Running results:
Array ( [0] => Array ( [volume] => 67 [edition] => 7 ) [1] => Array ( [volume] => 85 [edition] => 6 ) [2] => Array ( [volume] => 86 [edition] => 6 ) [3] => Array ( [volume] => 67 [edition] => 2 ) [4] => Array ( [volume] => 98 [edition] => 2 ) [5] => Array ( [volume] => 86 [edition] => 1 ) )
The above is the entire content of this article, I hope it will be helpful to everyone's study.
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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。

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。

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。

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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