数组加减问题
已知数组a和b。
//数组a:array ( 0 => array ( 'cust_no' => '310F6 1VA5A', 'lotno' => '2X15', 'part_count' => '32', ), 1 => array ( 'cust_no' => '310F6 1VA5A', 'lotno' => '2Z25', 'part_count' => '32', ),)//数组b:array ( 0 => array ( 'cust_no' => '310F6 1VA5A', 'total' => '48', ),)
数组a cust_no为310F6 1VA5A时,对应的总量是32+32=64,数组b cust_no为310F6 1VA5A时对应的总量是48。
想求得数组b总量为48时,对应数组a中的哪些内容?数组a剩余的结果是多少?
以这个例子来说,
得到数组a的结果:
//数组a:array ( 0 => array ( 'cust_no' => '310F6 1VA5A', 'lotno' => '2X15', 'part_count' => '32', ), 1 => array ( 'cust_no' => '310F6 1VA5A', 'lotno' => '2Z25', 'part_count' => '16', ),)
剩余数组a的结果:
//数组a:array ( 0 => array ( 'cust_no' => '310F6 1VA5A', 'lotno' => '2X15', 'part_count' => '0', ), 1 => array ( 'cust_no' => '310F6 1VA5A', 'lotno' => '2Z25', 'part_count' => '16', ),)
如何能得到这样的结果?
回复讨论(解决方案)
你之前不是问过这个问题了么?
如果你要对类似数组做很多纵向(column)计算的话,我建议你不如做个行列转换,思路就开阔多了
大不了计算完成后再一次行列转换换回来就是了
你之前不是问过这个问题了么?
如果你要对类似数组做很多纵向(column)计算的话,我建议你不如做个行列转换,思路就开阔多了
大不了计算完成后再一次行列转换换回来就是了
行列转换没用过,能简单举个例子么?
你之前不是问过这个问题了么?
如果你要对类似数组做很多纵向(column)计算的话,我建议你不如做个行列转换,思路就开阔多了
大不了计算完成后再一次行列转换换回来就是了
如果是数据库的行列转换,那是不是涉及到了交叉表?这个交叉表很麻烦啊。
不是数据库,就是php的数组,把一维和二维的key对调
$a[行][列] 转换成 $a[列][行] 而已
这样就可以把 $a[某列] 作为一个一维数组,做加减,交并差,累计都很方便
我记得以前发过的
//数组a:$a = array ( 0 => array ( 'cust_no' => '310F6 1VA5A', 'lotno' => '2X15', 'part_count' => '32', ), 1 => array ( 'cust_no' => '310F6 1VA5A', 'lotno' => '2Z25', 'part_count' => '32', ),); //数组b: $b = array ( 0 => array ( 'cust_no' => '310F6 1VA5A', 'total' => '48', ),);foreach($b as $source) { $num = $source['total']; foreach($a as $i=>$dest) { if($num == 0) break; if($dest['cust_no'] != $source['cust_no']) continue; if($num >= $dest['part_count']) { $num -= $dest['part_count']; $res[] = $dest; $a[$i]['part_count'] = 0; }else { $dest['part_count'] = $num; $res[] = $dest; $a[$i]['part_count'] -= $num; $num = 0; } }}var_export($res);var_export($a);
array ( 0 => array ( 'cust_no' => '310F6 1VA5A', 'lotno' => '2X15', 'part_count' => '32', ), 1 => array ( 'cust_no' => '310F6 1VA5A', 'lotno' => '2Z25', 'part_count' => 16, ),)array ( 0 => array ( 'cust_no' => '310F6 1VA5A', 'lotno' => '2X15', 'part_count' => 0, ), 1 => array ( 'cust_no' => '310F6 1VA5A', 'lotno' => '2Z25', 'part_count' => 16, ),)
不是数据库,就是php的数组,把一维和二维的key对调
$a[行][列] 转换成 $a[列][行] 而已
这样就可以把 $a[某列] 作为一个一维数组,做加减,交并差,累计都很方便
我记得以前发过的
好的,谢谢!我试试。

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
