递归更改数组(键名) 支持多层嵌套
无详细内容 无 /**递归更改数组(键名) 支持多层嵌套*@param $arr array*@param $stat int 0小写 1大写*/function array_change_key_case_d($arr,$stat=0){$func=$stat?"strtoupper":"strtolower";$_newArr=array();if(!is_array($arr)||empty($arr)){return $
/* *递归更改数组(键名) 支持多层嵌套 *@param $arr array *@param $stat int 0小写 1大写 */ function array_change_key_case_d($arr,$stat=0){ $func=$stat?"strtoupper":"strtolower"; $_newArr=array(); if(!is_array($arr)||empty($arr)){ return $_newArr; } foreach($arr as $k=>$v){ $_key=$func($k); $_newArr[$_key]=is_array($v)?array_change_key_case_d($v,$stat):$v; } return $_newArr; }

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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.

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.

The best practice for performing an array deep copy in PHP is to use json_decode(json_encode($arr)) to convert the array to a JSON string and then convert it back to an array. Use unserialize(serialize($arr)) to serialize the array to a string and then deserialize it to a new array. Use the RecursiveIteratorIterator to recursively traverse multidimensional arrays.

Recursion is a powerful technique that allows a function to call itself to solve a problem. In C++, a recursive function consists of two key elements: the base case (which determines when the recursion stops) and the recursive call (which breaks the problem into smaller sub-problems ). By understanding the basics and practicing practical examples such as factorial calculations, Fibonacci sequences, and binary tree traversals, you can build your recursive intuition and use it in your code with confidence.

Recursive definition and optimization: Recursive: A function calls itself internally to solve difficult problems that can be decomposed into smaller sub-problems. Tail recursion: The function performs all calculations before making a recursive call, which can be optimized into a loop. Tail recursion optimization condition: recursive call is the last operation. The recursive call parameters are the same as the original call parameters. Practical example: Calculate factorial: The auxiliary function factorial_helper implements tail recursion optimization, eliminates the call stack, and improves efficiency. Calculate Fibonacci numbers: The tail recursive function fibonacci_helper uses optimization to efficiently calculate Fibonacci numbers.

Recursion is a technique where a function calls itself, but has the disadvantages of stack overflow and inefficiency. Alternatives include: tail-recursion optimization, where the compiler optimizes recursive calls into loops; iteration, which uses loops instead of recursion; and coroutines, which allow execution to be paused and resumed, simulating recursive behavior.

PHP's array_group() function can be used to group an array by a specified key to find duplicate elements. This function works through the following steps: Use key_callback to specify the grouping key. Optionally use value_callback to determine grouping values. Count grouped elements and identify duplicates. Therefore, the array_group() function is very useful for finding and processing duplicate elements.
