Detailed explanation of PHP anonymous functions and anonymous classes

Anonymous functions, also called closures, allow you to temporarily create a function without a specified name. The value most commonly used as a callback function argument.

Closures can inherit variables from the parent scope. Any such variables should be passed in using the use language construct.

Used in built-in functions and custom functions respectively, sample code:

//递归为数组的每个元素应用回调函数 $arr = [ 'name' => ' joker', 'content' => [ 'date' => ' 2018-03-07 11:11:11', 'doing' => ' 测试匿名函数 ' ]];function array_map_recursive(callable $func, array $array) { return filter_var($array, FILTER_CALLBACK, ['options' => $func]);}//调用示例$prefix = '前缀：';$arr1 = array_map_recursive(function($v) use($prefix) { return $prefix.trim($v);}, $arr);$arr2 = array_map(function($v) { return is_string($v)?trim($v):$v;}, $arr);

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