PHP Lambda and closures

Lambda

My own understanding, lambda is to save the method name into a variable to invoke the method, the typical create_function is to return the lambda method.

1 $newfunc = create_function (' $a ', ' echo ' What U put on is '. $a; '); 2 $newfunc (' aaaaa ');

It's easier to write the name of the lambda method yourself, and then call it in this form.

1 function dump ($a) {2      var_dump ($a), 3}4 $a = ' dump '; 5 $a (' 321 ');

Closures,

Here's a simple syntax for PHP closures, consider the following code:

1 class closuretest{2 public      $multiplier, 3 public      function __construct ($multilier) {4           $this Multiplier= $multilier; 5      } 6   7 public      function Getclosure () {8           $self = $this, 9           return function ($number) use ($self) {10                return $number * $self->multiplier;11           };      }13}14 $test = new Closuretest, $x = $test->getclosure (); Echo $x (8); $test->multiplier= 11;19 echo $x (8);

The final result is: 8088.

The use must be used to pass a value to the closure, otherwise the notice will be prompted when the variable is not defined.

The closure cannot pass the $this pointer directly, so the $this is saved in the $self first.

It is also not shown in the code that the use of a class member into a closure must be passed by reference, otherwise the value of the changed member will not be changed later than in the package.

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