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POHow do I pass undefined vars to functions without E_NOTICE errors?
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copied!<p>Pretty simple question really, how do I pass undefined vars to functions without E_NOTICE errors?</p> <p>When passing undefined variables to functions such as isset(), no error is raised, but send the same to your own function and you'll get a Notice: Undefined offset: etc.</p> <p>I have thought of a few reasons to want this today, but my current function is almost a clone of isset except it will check if <em>any</em> of the args are set, rather than all like isset(a,b,c) does.</p> <pre><code>function anyset() { $argc = func_num_args(); $argv = func_get_args(); for ($i = 0; $i < $argc; $i++) if (isset($argv[$i])) return true; else return false; } </code></pre> <p>Now, I have for example a giant 2d array of [x][y], into which values will be placed at random. I need to check the randomized co-ords contains anything "next" to it (x-1,y-1 to x+1,y+1) etc.</p> <p>I do not want to do a loop of 20,000,000 and initialise each variable. I just want to send 9 vars and check if any are already set.</p> <pre><code>while (anyset($items[$x-1][$y-1],$items[$x][$y-1],$items[$x+1][$y-1], $items[$x-1][$y],$items[$x][$y],$items[$x+1][$y], $items[$x-1][$y+1],$items[$x][$y+1],$items[$x+1][$y+1])); </code></pre> <p>Like so. </p> <p>I could just do isset(x) || isset(x) || isset(x) but that doesn't look very nice.</p> <p><strong>Is there a way to allow undefined variables to pass to my function without raising errors?</strong></p> <p>Not interested in taking the easy option ;)</p> <p>Thanks for reading!</p> <p>\o</p> <p><strong>Update:</strong> 12 April 2012, 21:03 Looks like there is no special feature allowing this to happen. So either pass like anyset(@$array[0], @$array[1]) etc, or just wrap everything in a thousand issets like so:</p> <pre><code>while (isset($items[$x-1][$y-1]) || isset($items[$x][$y-1]) || isset($items[$x+1][$y-1]) || isset($items[$x-1][$y]) || isset($items[$x][$y]) || isset($items[$x+1][$y]) || isset($items[$x-1][$y+1]) || isset($items[$x][$y+1]) || isset($items[$x+1][$y+1])); </code></pre> <p>Hope this helps someone else in the future!</p>

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