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Found 5 results

  1. Hi Larry, It's been a while since I've visited the forums so I hope that all is well with you. I have a question that you have already answered on page 51 and that is to do with the closing ?> The context I have is some php code that optionally 'requires' a php function which is the only thing in the .php file being 'required'. Is there any difference that the .php file which is the function is being optionally 'required' versus just 'required' in the normal code stream? The php file with the function does have the opening <?php tag but it is being included within a php code stream. Should I have the opening tag in the function 'include'? Originally I had the closing ?> in the function code and that worked fine in my development environment, but caused the error message in the production environment. My development environment is Windows 7 with xampp providing localhost. Many thanks in anticipation for your advice, or that of any other forum member. Cheers from Oz.
  2. var obj { var name: 'some value', mtd: function () { alert(name); } } obj.mtd(); The mtd function defined in obj has no defined parameters, but when called the this reference and argument list are passed to the function. Is the name property of obj also present in the mtd function so it can be used in the alert() call as above, or does the mtd function have nothing to do with the property named name? if lerry ullman answer my question than it would be so great
  3. Hi All, I am struggling with the naming of values and a comparison operator. I was fine with how this all worked until I ran into this snippet of code. I am not sure how it works or the logic behind it. function create_radio($value, $name = 'gallon_price') { // Start the element: echo '<input type="radio" name="' . $name .'" value="' . $value . '"'; // Check for stickiness: if (isset($_POST[$name]) && ($_POST[$name] == $value)) { echo ' checked="checked"'; } // Complete the element: echo " /> $value "; Specifically, the comparison value of ($_POST[$name] == $value) doesn't make since to me. We defined the variable $name as 'gallon_price' and $value as some input which would normally be our supplied gasoline price (a number) I understand this is not really here to comare actual values but to see if they are set, but I don't see how this does this. It seems more logical to see that $value is set. Can someone explain how this works? Signed - Confused a bit. Jim
  4. hi everyone, In the last 4 weeks I've spent A LOT of time with Larry's book and Lynda.com videos (pertaining to PHP). I want to thank Larry for making such a clear and linear guide for PHP beginners. But anyways, I'm working on a small script and I want to list the contents of a directory, make them into hyperlinks, and then edit those hyperlinks to look pretty (I.e. not show an ugly super long path name), then limit the number files echoed back to the browser. I was thinking about using this: <?php $path = "/full/path/to/files"; if ($handle = opendir($path)) { while (false !== ($file = readdir($handle))) { if ($file != "." && $file != "..") { $files .= '<a href="'.$file.'">'.$file.'</a>'; } } closedir($handle); } ?> or this: <?php $sub = ($_GET['dir']); $path = 'enter/your/directory/here/'; $path = $path . "$sub"; $dh = opendir($path); $i=1; while (($file = readdir($dh)) !== false) { if($file != "." && $file != "..") { if (substr($file, -4, -3) =="."){ echo "$i. $file <br />"; }else{ echo "$i. <a href='?dir=$sub/$file'>$file</a><br />"; } $i++; } } closedir($dh); ?> But I dont want to list the files like this: C:/example/example2/Hello.pdf I want to edit the variable. Is that possible? To make it say something as simple as "Hello." I want to limit the amount of files listed as well. For example: only list the first 5 files, or last 5, etc. Is there a function or some kind of parameter for that? I appreciate any help or push in the right direction. Thanks
  5. My question (long winded...sorry!): I'm a little confused at exactly how usort works and what it expects from a user created comparison function. According to PHP.net "The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second." The examples on the same page use the following function to do a very simple numeric comparison: function cmp($a, $b){ if ($a == $b) { return 0; } return ($a < $b) ? -1 : 1; } This would return either a +ve, -ve or 0 value depending on the comparison result. This is (as PHP.net says in the description above) what usort expects. Your scripts in Chapter 1 (sort.php) use the following much simpler function for numeric comparison: function grade_sort ($x, $y) { return ($x['grade'] < $y['grade']); } The way I see it this only returns a 1 (+ve) or 0 value (Boolean) as it is a simple "less than" comparison. This would make me think that values which would have returned a -ve return and subsequently be moved in the array using PHP.net's method will return 0 and remain static using your method, and therefore the array would require many more iterations for a complete sort. However, when I scripted both examples (I modified your sort.php script) and had it print the iteration number, comparison details and final returned values as it sorted the array I saw no difference between the number of iterations performed or the values compared. The returned values werek as I expected, where your method returned 0's for everything that didn't match your "less than" comparison and PHP.net's returned all three values, but ultimately it made no difference to how the array was sorted. Can you explain what is happening here? Is usort only concerned with a simple Boolean response despite PHP.net's description that it would prefer 3 types of return? It certainly seems the case...or of course I have the entire theory totally wrong! Thanks, Rich
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