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Doc Bug #78403 array_diff() no longer explicitly mentions key preservation
Submitted: 2019-08-12 07:51 UTC Modified: -
From: roy-orbison at devo dot net dot au Assigned:
Status: Open Package: Documentation problem
PHP Version: Irrelevant OS:
Private report: No CVE-ID: None
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From: roy-orbison at devo dot net dot au
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 [2019-08-12 07:51 UTC] roy-orbison at devo dot net dot au 
Description:
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From manual page: https://php.net/function.array-diff
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It's implied from the example, but should be stated clearly that keys of the values in the first array are used for constructing the resultant array, regardless of the keys' types.

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