Join David Powers for an in-depth discussion in this video Merging values from different iterators with MultipleIterator, part of Learning the Standard PHP Library.
- 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 MultipleIterator using print_r…
Author
David Powers
Released
10/22/2014- Using SPL iterators
- Inspecting directories
- Working with text files
- Exporting and extracting data
- Filtering data
- Converting between arrays and iterators
- Combining and merging iterators
- Creating a repeat sequence with InfiniteIterator
- Working with data structures
Skill Level Intermediate
Duration
Views
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Introduction
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Welcome59s
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1. Introducing the Standard PHP Library (SPL)
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Introducing SPL iterators1m 59s
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Using SPL iterators2m 6s
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2. Exploring Files and Directories
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3. Filtering Values
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4. Array Iterators
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Filtering values from JSON4m 45s
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5. Combining and Merging Iterators
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6. Other Iterators
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7. SPL Data Structures
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Using SplStack and SplQueue6m 25s
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Understanding heaps2m 55s
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Conclusion
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Goodbye1m 37s
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Video: Merging values from different iterators with MultipleIterator