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extracting specific array keys


jimfog
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I have an array like this one:

$weekdays_all=['monday'=>NULL,'monday_b'=>NULL,'tuesday'=>NULL,'tuesday_b'=>NULL.etc];

I want to extract all the _b days from it and push them into a new array...

$b_days=['monday_b'=>NULL,'tuesday_b'=>NULL];

How I am going to do it?

 

 

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