powershell foreach object

foreach traversal arrays are common, and foreach can also traverse objects Do the following tests: Class I {public $a = ' a '; protected $b = ' B '; Private $c = ' C '; Private $data = Array (' Fantasy ', ' windows ', ' Linux '); Internal foreach Traversal class function traversable () { foreach ($this as $ke

"]; Ok.name= "Sblzh"; Add a member variable to this array object //Add a member method to this array object ok.myfun=function (x,y) {return x+y; }; Attempt to traverse with for-of for (let I of OK) { console.log (i);//Note that there is no need for ok[i], just use one I } Output LZH is rubbish sb big SB Dog the foreach () method of an iterative

Submitted by marsmus on 2009, June 9, PM. php Let's take a look at a piece of code to introduce problems from this code. Read the following sample code carefully to see if there are any problems (I didn't know how to process the PhP5 foreach object array before, so I thought it was the same as a normal array, and it was a copy operation) From the output, we can see that the data of the

How can an object perform a foreach loop like an array? I didn't take into account the Iterator mode when I first got into touch with the question. I tried some general ideas, and after the failure .... I directly looked at the source code implementation of foreach, hoping to find out whether there is any special feature when

foreach in PHP is often used as a function to iterate over an array, and for a case where the elements in the array are values (such as an array of common types), foreach simply copies the values of each element in the array to the variable following each.That is, a copy of the value itself , which changes its value without affecting the array itself.Such as: $arr = (1, 2, 3);

Just touched the question, I did not consider the iterator model, tried a few general ideas, after the failure .... Just go to look at the source of the foreach implementation, expect to find out when the foreach processing object when there is any particularity, can be done as a breach. After a half-day of tracking, a strange switch in the core logic was found:

Just contact to the problem, I did not take into account the iterator mode, tried a few general ideas, after the failure .... Directly to look at the source of the implementation of foreach, expect to find a foreach processing object when there is any particularity, you can do as a breakthrough. After half a day of tracking, a strange switch in the core logic wa

VaR is a dynamic parameter. It dynamically obtains the type of the data to be convenient to define its own type. In theory, the unpacking process is not involved. Object is a data type that involves the data unpacking and packing process, which occupies the memory.Q: Does var report an error or trigger an exception when the stored data type is not the same?Verification: VaR is suitable for convenience when the data type is not temporary. 1 arraylist

So that your PHP object can be foreach, and attributes are modified using Private If you are bored, you can play with it.The traversal object is actually just a specific attribute of the array type in the object.You can use foreach directly after PHP5, but private members of the class cannot access it.The

1Iteratorextendstraversable {2 /*Methods*/3 Abstract Public Mixed Current(void)4 Abstract PublicScalarKey(void)5 Abstract PublicvoidNext(void)6 Abstract PublicvoidRewind(void)7 Abstract Public Booleanvalid (void)8}Therefore, for this question, the following answers can be made:1 classSampleImplementsIterator2 {3 Private $_items=Array(1,2,3,4,5,6,7);4 Public function__construct () {5;//void6 }7 Public function Rewind() {Reset($this-_items); }8 Public function Current