PHP Closed Package Instance parsing

Source: Internet
Author: User
Tags closure

Typically, closures are also anonymous functions of PHP, but unlike functions, closures can use the value of the variable in the scope where the function declaration is used.

The specific form is as follows:

1 $a = function ($arg 1, $arg 2) use ($variable) {
2 Declare function closure to variable $a, parameter is $ARG1, $arg 2, the closure needs to use $variable variable
3 }

Examples of specific uses are as follows:

01 <?php
02 $result = 0;
03
04 $one = function ()
05 {var_dump ($result);};
06
07 $two = function () use ($result)
08 {var_dump ($result);}; You can think $two the variable itself records the declaration of the function and the value of the variable used by use
09
10 $three = function () use (& $result)
11 {var_dump ($result);};
12
13 $result + +;
14
15 $one (); Outputs NULL: $result is isn't in scope
16 $two (); outputs int (0): $result was copied
17 $three (); outputs int (1)
18 ?>
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