In PHP, how does the result of the foreach loop help explain the principle of output results? C # foreachjavascriptforeachcforeach

Foreach: In PHP, how does the result of the foreach loop explain the output principle? : In PHP, how does the result of the foreach loop explain the principle of the output result? The code is as follows:;} foreach ($ arras $ value) {echoValue:. $ value. & lt;

In PHP, how does the result of the foreach loop help explain the principle of output results?
The code is as follows:


 $ Arr = array ('one', 'two', 'Three ');
Foreach ($ arr as & $ value) {echo 'value: '. $ Value .'
';}
Foreach ($ arr as $ value) {echo 'value: '. $ Value .'
';}
?>
Output result:
Value: one
Value: two
Value: three
Value: one
Value: two
Value: two

The foreach with & for the first time does not change the content of the array ..
Instead, the last loop $ value references the last item of the array (you can test whether the result of the second loop will not change after the first loop ends unset ($ value ),
In your second foreach, $ value variable is also used, which causes a weird problem (you can change the variable, such as $ val, and the output array will not change ).
The second foreach is assigned to $ value, but $ value is the last value of the referenced array,
So
In the first loop, one is assigned to the last value,
The second assignment of two to the last one,
The third time, that is, the last one has been assigned as two in the second loop, so it is still two.

The above introduces the reference of & pass value in PHP. what is the principle of the output result after the result of the foreach loop ?, Including foreach content, hope to be helpful to friends who are interested in PHP tutorials.