Description:
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The code speaks for itself: in_array founds a string in the array when it definitely should not.

The code is kept simple - I've also used variables and verified variable types with gettype, so it's _should not_ be a matter of using strict parameter.

Using the third 'strict' parameter it works as expected, even if it's definitely not a question of types. Tested under several PHP versions and platforms.

Reproduce code:
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<?php

$ids = Array ( '+36901112222', 'xxxxx', 'zzzzz' );

echo in_array( ' 36901112222', $ids ) ? 'found' : 'not found';

?>

Expected result:
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It should not find the string and should echo "not found".

Actual result:
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"found"