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Expression values

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For example if $x=”"; what will empty($x) return? or is_null($x)? Or the even more surprising one: $x = “0″ will return TRUE on empty() even though it is considered a string.

This entry was posted on Wednesday, September 22nd, 2004 at 9:22 am and is filed under Bookmarks. You can follow any responses to this entry through the RSS 2.0 feed. Responses are currently closed, but you can trackback from your own site.

2 Responses to “Expression values”

  1. Mark J Says:
    September 22nd, 2004 at 7:59 pm

    Very tricky stuff… don’t even get me started on the triple equals… if ($x === 1)

  2. michel Says:
    September 23rd, 2004 at 6:28 pm

    This is why empty() blows and why it should be avoided.
    (And why checking the data type is most usually a good idea if you need accurate results!)