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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