Php--each and List usage list for each safe each list as value I JS traverse List collection EAC

Usage of 1.each
Look at the API first
Array each (array & $array)
This is described in the API: each-returns the current key/value pair in the array and moves the array pointer forward one step
Let's take a look at what the returned array looks like.

 !--? php  $arr  =  array  ( ' You ' ,  ' if ' ,  ' ann ' ,  ' good ' ,  ' ,  ' is ' ,  ' Sunny ' ,  ' Day ' ;p rint_r (  $arr )); Print_r (each ( $arr ));  Echo   '  ' ; /* Returns an array ([1] = = You [value] = you [0] = 0 [key] = 0) Array ([1] = = if [value] = if [0] = 1 [key] + 1) */ //execute the same piece of code, from ' You ' to ' if ', stating that each is executed once, the cursor moves to the end of the array  //0 and key is the key  //1 and value holds the value  //So each satisfies the traversal of the array, gets the current key and value, and each time it executes, moves the trailing cursor to the tail  // So the loop array can also be written with each  reset ( $arr );  for  (;  $tmp  =each ( $arr );) { echo   $tmp  [ 0 ],  ' ~ ' ,  $tmp  [ 1 ],  ' 
 ' ;} /* Return 0~ you 1~ if 2~ ann 3~ good 4~ then 5~ is 6~ sunny 7~ Day */ ?   

Usage of 2.list
Let's see what the API says.
Like Array (), this is not a real function, but a language structure. List () assigns a set of variables in one-step operation.
Take a look at an example:

   
    list($a,$b)=array(10,20);echo$a,'~',$b,'
';//返回10~20?>

Yes, you can assign values to a set of variables.
Let's look at another example:

   
    list($a,$b,,$c)=array(2=>10,3=>20,4=>30,1=>40);echo$a,'~',$b,'~',$c,'
';//返回notice~40~20//执行到$a的时候返回给我一个notice：说数组没有0键?>

According to the general idea should return: 10~20~40
Why did you return to this notice~40~20?
A: This involves the operation of the list, the list is so assigned
First: Do not tube to the right of the array, see the list of variables, from left to right should be a=aRr[0] B=ARR[1] C=aRR[3]thenafter:fromRightto theleftOpenStartFuvalue,Fuvalueof theShunOrderis a C=ARR[3] b=aRr[1] A=ARR[0]
So c= b = 40 because there is no arr[0], so $ A has given a warning
3. Iterating through arrays with each and list

   
    $arr = array('你','若','安','好','便','是','晴','天');for(;list($k,$v)=each($arr);){    echo$k,'~',$v,'
';}/*return:0~你1~若2~安3~好4~便5~是6~晴7~天*/?>

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The above describes the use of Php--each and list, including the each,list aspects of the content, I hope the PHP tutorial interested in a friend helpful.

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