PHP范围子匿名函数在父函数中改变变量

Question

I have the following code.

function up() {
    $runafterupdate = [];
    Schema::connection('exitproducts')->create('exitcontrol_carmanager_manager',  function($table)
                {
                    $table->engine = 'InnoDB';
                    $table->increments('id');
                    $table->string('code');
                    $runafterupdate['code'] = true;
                    $table->timestamps();
                });
            }
    if(isset($runafterupdate['code'])) {
        echo "it worked!";
    }
}

And i'm used to JavaScript where you can alter the values of the parent scope, but aparently php follows different rules. I've tried reading through http://php.net/manual/en/language.variables.scope.php but I really don't want to use globals.

Is there a way to alter the variables in the parent scope with php or is my only resort in this case a global variable?

Answer 1

After some more digging... why do I always find the answers AFTER I post a question...

Using the use clause on the function you can use the variables you declare there in the "child" scope. That this isnt highlighted in the scope documentation in php docs beats me.

Extracted from Reference: What is variable scope, which variables are accessible from where and what are "undefined variable" errors?

Extending the scope of variables into anonymous functions

$foo = 'bar';

$baz = function () use ($foo) {
    echo $foo;
};

$baz();

After some fiddling I found i can't directly modify array variables. Any modifications stay in the function scope but dont lift over to the parent scope.

I made a simple holder object with setters and getters to get it to work.

function scop1() {
/** simple class to hold vars **/
class holder {
 public $held = [];
 /** setter **/
 function update($what, $with) {
        $this->held[$what] = $with;
    }
 /** getter **/
 function get($what) {
    if(isset($this->held[$what])) return $this->held[$what];
    else return null;
 }
}
$var = new holder();
/** works **/
$var->update('hello','bye');
$x = function() use ($var) {
   /** modify parent scope **/
   $var->update('hello','hello');
};
/** call anomynous function **/
$x();
/** it should say hello hello in held **/
var_dump($var);
}
scop1();

live sample: http://sandbox.onlinephpfunctions.com/code/d7464356c0712f2606b0f70ab952be4d782374dc