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This article mainly introduces how php uses foreach ($arr as & $value). It is very detailed and has certain reference value. Friends who are interested must finish it!

Since PHP 5, you can easily modify the elements of an array by adding & before $value. This method assigns a value by reference rather than copying a value.

The copy code is as follows:

This method is available only if the traversed array can be referenced (for example, a variable).

The copy code is as follows:

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