Anonymous functions
Anonymous functions
Anonymous functions, also known as closures, allow the creation of functions which have no specified name. They are most useful as the value of callback parameters, but they have many other uses.
Anonymous functions are implemented using the Closure class.
Example #1 Anonymous function example
<?php echo preg_replace_callback('~-([a-z])~', function ($match) { return strtoupper($match[1]); }, 'hello-world'); // outputs helloWorld ?>
Closures can also be used as the values of variables; PHP automatically converts such expressions into instances of the 登录查看完整内容