How to loop through an array in php and modify the values

How to loop through an array and modify the value in php: 1. Directly modify the value of the array key through a foreach loop; 2. Add an "&" symbol in front of "$item" to modify the value of the array key.

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Such modifications are not It's not the modification itself. $item is equivalent to assigning a value in the array, just like the value type in JAVA. I just took your value, not your memory address. That's all $ Changing the item will not affect the array

The first way is to directly modify the value of the array key

This is OK Modified

The second method is to add an ampersand in front of $item, so that it can be modified directly like an object

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