extracting specific array keys

[jimfog]

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?

 

 

[davej]

Maybe...

foreach ($weekdays_all as $key => $value) {    if (strpos($key, '_b', strlen($key)-2) !== false)      $b_days[$key] = $value;    }}