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Thread: 1D object in string works, 2D object doesn't - puzzled

  1. #1
    Join Date
    Jan 2006
    Location
    South Africa
    Posts
    62

    1D object in string works, 2D object doesn't - puzzled

    Hi, everyone!

    I have come across a "feature" in PHP5 that is not a great problem to me, but has me puzzled. Can anyone shine some light on this?

    The following snippet works fine:
    $x->y = "hello";
    echo "Let me say $x->y to you!\n";

    However, if I modify $x->y (what I shall loosely call a one-dimensional object, analogous to arrays) to $x->y->z (a "two-dimensional object" for lack of a better term) as follows:
    $x->y->z = "hello";
    echo "Let me say $x->y->z to you!\n";

    ...this snippet generates the following error message:
    Catchable fatal error: Object of class stdClass could not be converted to string

    When I change it to:
    $x->y->z = "hello";
    echo "Let me say " . $x->y->z . " to you!\n";

    ... then all is well again. So that's the work-around, problem solved, fine... but what has me puzzled as to why this behavior occurs in the first place.

    Ideas, anyone?

    // FvW

  2. #2
    Join Date
    Aug 2004
    Location
    Ankh-Morpork
    Posts
    19,148
    I think it's a question of how the parser identifies variables to be interpolated within a double-quoted string, as "complex" variable notation works, making it clear to the parser where the variable begins/ends within the string:
    PHP Code:
    $x->y->"hello";
    echo 
    "Let me say {$x->y->z} to you!\n"
    "Please give us a simple answer, so that we don't have to think, because if we think, we might find answers that don't fit the way we want the world to be."
    ~ Terry Pratchett in Nation

    eBookworm.us

  3. #3
    Join Date
    Jan 2006
    Location
    South Africa
    Posts
    62
    Yep, that works! And it's easier than concatenating strings with dots. :-)

    There are obviously limitations to the parser's ability to recognize variables embedded in strings... but if these are well documented I haven't been able to find out much about it. Oh well. Onward! :-)

    Thanks!

    // FvW

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