array_column:将一个多维数组的转换为一个键值对数组

XREAL launched a new product - XREALBeamPro at the spatial computing new product launch conference, priced from 1,299 yuan. According to the official introduction, XREALBeamPro is a computing terminal that gradually releases 2D applications into 3D space. Equipped with XREALAR glasses, it will form a "complete consumer-grade AR space computing system" and minimize the migration cost of users from the mobile phone side. In terms of design, XREALBeamPro looks like a smartphone, but it is not a mobile phone product, but a spatial computing terminal equipped with a touch display. It is officially positioned as an “AR spatial computing terminal like a Phone”. At the press conference, XREAL founder and CEO Xu Chi expressed his enthusiasm for BeamPro’s capabilities.

The method of using a foreach loop to remove duplicate elements from a PHP array is as follows: traverse the array, and if the element already exists and the current position is not the first occurrence, delete it. For example, if there are duplicate records in the database query results, you can use this method to remove them and obtain results without duplicate records.

Methods for deep copying arrays in PHP include: JSON encoding and decoding using json_decode and json_encode. Use array_map and clone to make deep copies of keys and values. Use serialize and unserialize for serialization and deserialization.

The performance comparison of PHP array key value flipping methods shows that the array_flip() function performs better than the for loop in large arrays (more than 1 million elements) and takes less time. The for loop method of manually flipping key values ​​takes a relatively long time.

Multidimensional array sorting can be divided into single column sorting and nested sorting. Single column sorting can use the array_multisort() function to sort by columns; nested sorting requires a recursive function to traverse the array and sort it. Practical cases include sorting by product name and compound sorting by sales volume and price.

As a technology company driven by innovation, Christie is able to provide comprehensive solutions, rich industry experience and a complete service network in intelligent audio-visual technology. At this year's InfoCommChina, Christie brought RGB pure laser projectors, 1DLP laser projectors, LED video walls, and content management and processing solutions. At the event site, a large-scale customized outer spherical dome specially designed for astronomical displays became the focus of the scene. Christie named it "Sphere Deep Space", and the Christie M4K25RGB pure laser projector gave it "green vitality" . Mr. Sheng Xiaoqiang, senior technical service manager of the Commercial Business Department in China, said: It is not difficult to realize an outer spherical dome projection, but it can be made smaller and the color

NTT QONOQ Devices has unveiled the Mirza wireless XR glasses for smartphones, freeing users from needing to wrangle cords. The glasses can display virtual AR content in real-world spaces like Pokemon Go or their phone content on a large virtual displ

PHP's array_group_by function can group elements in an array based on keys or closure functions, returning an associative array where the key is the group name and the value is an array of elements belonging to the group.