PHP SplFileInfo: "Too many open files"

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peter_b
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PHP SplFileInfo: "Too many open files"

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[PROBLEM]
Storing clones of SplFileInfo objects in an array to sort them, throws the following error:
failed to open dir: Too many open files in [...]
[SOLUTION]
If only I had seen Ken Snyder's comment on PHP DirectoryIterator's documentation page before:
Don't store DirectoryIterator objects for later; you will get an error saying "too many open files" when you store more than the operating system limit (usually 256 or 1024).
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