- Because SPL iterators allow you to traverse…directories and other structures with a for each loop,…just like an array, it's easy to forget…that arrays and iterators are not the same.…You can't chain iterators onto an array…without first converting the array to an iterator.…Nor can you pass an iterator…as an argument to an array function.…To show you what I mean, I have opened array.php,…which contains a simple array called languages…and then loops over it.…You can find a copy of this file in the chapter four folder…of the exercise files.…
So let's just load this into the browser.…And we get all of the elements of the array displayed.…Nothing surprising about that.…That's how arrays work.…But let's say we want to limit…the range of values displayed.…Let's try to chain LimitIterator to the array.…So a new line on line three, we'll call it languages again.…New LImitIterator, and then we'll pass it…our languages array.…The second argument is where you want to begin,…counting from zero, so we'll start from the third item.…
Author
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
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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: Converting between arrays and iterators