From the course: Learning the Standard PHP Library
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Merging values from different iterators with MultipleIterator - PHP Tutorial
From the course: Learning the Standard PHP Library
Merging values from different iterators with MultipleIterator
- The MultipleIterator class merges values from two or more iterators, but in a fundamentally different way from AppendIterator. AppendIterator loops through values consecutively in the order they were appended. MultipleIterator, on the other hand, processes values in parallel, generating merged Arrays. The difference should become clear with the code in this page, append_multiple.php which you can find in the Chapter Five folder of the Exercise Files. It contains three Arrays of names, boys, girls, and unisex, each of which is passed to ArrayIterator, making it available for chaining with other iterators. All three Arrays are appended to an instance of AppendIterator, and then a foreach loop displays each value. Line 16 creates an instance of MultipleIterator, and the same three Arrays are attached using the attachIterator method. Notice that MultipleIterator uses attachIterator, whereas AppendIterator uses append. Then, on Lines 23 to 25, a foreach loop displays the results of…
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