Usage of PHP interview questions foreach ($arr as $value) and foreach ($arr as $value)

Interview questions ：

<?php
$arr = [0,1,2,3,4];

foreach ($arr as &$val) {
    
	// nothing
}
foreach ($arr as $val) {
    
	// nothing
}
//  What will be output 
var_export($arr);
/********* **  answer ：** *********/
array (
  0 => 1,
  1 => 2,
  2 => 3,
  3 => 8,
  4 => 'a',
  5 => 'a',
)

For detailed explanation, please refer to ：
https://blog.csdn.net/smxdgf/article/details/105370166