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alecks

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Posts posted by alecks

    Static methods

    in PHP Coding Help

    Posted

    Just a bit confused as to how PHP handles static methods; my impression is that they cannot be accessed through an instance ($obj->staticMethod();), only using the scope res op (class::staticMethod();). Is this correct?

    [SOLVED] jQuery remove <li>s from a <ul>

    in Javascript Help

    Posted

    I have a list (<ul>), and I want to remove the items (<li>s) from within it using jQuery. How do I do it? I tried it this way:

     

    JavaScript:

    $(function()
{
    $('ul.test').remove('li');
});

     

    HTML file:

    <ul class="test">
   <li>List item number one.</li>
   <li>List item number two.</li>
</ul>

     

    Thanks!

    [SOLVED] addslashes()

    in PHP Coding Help

    Posted

    Consider this query:

     

    $query = "SELECT * FROM users WHERE username = ''. $_POST['username'] .''";

     

    The user could send "' OR '1'='1" as their username, which would make the query:

     

    $query = "SELECT * FROM users WHERE username = '' OR '1'='1' ";

     

    Which would always come back as true (not false) if queried. The user could of course do something even more malicious :o. What mysql_real_escape_string does is add slashes before the quotes, so they are taken literally, not as parts of the query.

     

    $query = "SELECT * FROM users WHERE username = '\' OR \'1\'=\'1\''";

     

    In this query where the input is escaped the username would have to be "' OR '1'='1" in order for the query to come back as true (not false).

    Associative Array to Object

    in PHP Coding Help

    Posted

    That does work; the context I was trying to implement it was within the object instantiation. I wanted to fetch data from a database and then change the array into object vars. Ex:

     

    <?php
class obj{
  function obj($name) {
    $data = <fetch from database>
    $this = (object) $data;
  }
}

$obj = new obj('name');
?>

     

    PHP's Lack of Pointers

    in PHP Coding Help

    Posted 

    $GLOBALS['glob_var'] = 10;

$var =& funk();
echo 'SHOULD BE 10: '.$var."<br />\n";
$GLOBALS['glob_var'] = 11;
echo 'SHOULD BE 11: '.$var."<br />\n";

function funk()
{
$ref_var = &$GLOBALS['glob_var'];
echo 'SHOULD BE 10: '.$ref_var."<br />\n";

return $ref_var
}

     

    ???

    PHP's Lack of Pointers

    in PHP Coding Help

    Posted

    with global-ized variables or super globals like $GLOBALS it isn't necessary to reference them within a function, ex

     

    $my_var = 12345;
echo $my_var;

function afunc() {
global $my_var;
$my_var = 23456;
}

afunc();

echo '<br />'.$my_var;

     

    would output

     

    12345

    23456

     

    References are useful when passing variables to functions and you want to modify them, ex:

     

    $my_var = 12345;
echo $my_var;

function afunc(&$ref_to_my_var) {
$ref_to_my_var = 23456;
}

afunc($my_var);

echo '<br />'.$my_var;

     

    will output

     

    12345

    23456

    Extracting text from website

    in PHP Coding Help

    Posted

    and here we go...

     

    <?php
// http://www.phpfreaks.com/forums/index.php/topic,186985.0.html

if($getcon = file_get_contents("http://www.fedex.com/Tracking?ascend_header=1&clienttype=dotcom&cntry_code=us&language=english&tracknumbers=222222222222222")) {
  $one = strpos($getcon, "<!-- BEGIN Scan Activity -->");
  $final = substr($getcon, $one);
  $two = strpos($final, "<!-- END Scan Activity -->");
  $final = substr($final, 0, $two);
  
  echo $final;
} 
else {
  echo "Error: Could not connect to page...";
}

?>

    Extracting text from website

    in PHP Coding Help

    Posted

    OK I just had a quick look at the source of the page you are trying to extract data from, I assume you are trying to get the table that lists status? Well in the source it is nicely surrounded by '<!-- BEGIN Scan Activity -->' and '<!-- END Scan Activity -->', you can use strpos() to find where these are as a string index, and then you can just get the data in between the two.

    Basic PHP assignment

    in PHP Coding Help

    Posted

    The header("Location: ...")s don't do anything but redirect the user to a new page. It validates what data the user has sent using an HTML form and depending on that data it gives an appropriate response. (For example, the first one "!isset($_REQUEST['email'])" checks to see if the user has given his/her email address (if the inverse of the value returned by isset($_REQUEST['email']) is true); if the user hasn't, simply take them back to the original form.

     

    It sounds like you are from a C (or like) background; note that PHP does not have header files in the context you are using them; header() refers to the http:// header sent to the clients web browser.

    Autoload vs. require_once performance-wise

    in PHP Coding Help

    Posted

    Seems that doing the latter (require_once each time) is a bit faster. Put together some test scripts and made 998 classes, each in their own file, and then timed __autoloading each class and then require_once-ing each class. Here is what I did, specifically.

     

    1. I made a function to generate a file name (and class name) and then looped to make 1000 different php files, and store them in array, name=>file.

    2. When it finished making those files, it prints out a string formatted like an array creation string ('something' => 'something else', ...), which I copied to make an array in a new script.

    3. For the require_once, I looped through the above array and included each file, immediately afterward adding a new object to an array.

    4. I microtimed each file inclusion method individually; here are the results:

     

    Note: I had to delete 2 of the classes because they were randomly named 'use' and 'try', which are reserved...

     

    I restarted my server after each trial...

     

    __autoload each

    -----------------

    0.115617036819

    0.177067041397

    0.110083890915

    0.134618959427

    0.148484945297

     

    require_once each

    -----------------

    0.124009132385

    0.120284080505

    0.106649875641

    0.103686809542

    0.103996038437

     

    Soooo yeah.

     

    EDIT: test script stuff

    class timer {
  public function timer() {
    $this->resume = $this->cur_time();
    $this->pause = 0;
    $this->state = TRUE;
    $this->total = 0;
  }
  
  private function cur_time(){
    $time = explode(' ', microtime());
    return $time[1].substr($time[0], 1);
  }
  
  public function pause() {
    if ($this->state) {
      $this->pause = $this->cur_time();
      $this->total = $this->pause - $this->resume;
      $this->state = FALSE;

      return $this->total;
    }
  }
  
  public function resume() {
    if (!$this->state) {
      $this->resume = $this->cur_time();
      $this->state = TRUE;
    }
  }
}

/* 
* File gen
* 
function fill($len) {
    $chars = "abcdefghijkmnopqrstuvwxyz";
    $i = 0;
    while ($i < $len) {
        $fill = $fill.substr($chars, rand(0,24), 1);
        $i++;
    }
    return $fill;
}

$huge = array();

$i = 0;
while ($i < 1000) {
$name = fill(3);
  if (!file_exists("lots_o_files/".$name.".php")) {
    $file = fopen("lots_o_files/".$name.".php", "w");
    fwrite($file, "<?php class $name { function $name(){} } ?>");
    fclose($file);
    $huge[$name] = $name.".php";
    $i++;
  }
}

foreach ($huge as $name => $file) {
echo "'$name'=>'$file', ";
}

echo "<br />";

foreach ($huge as $name => $file) {
echo "require_once 'lots_o_files/$file';";
}
*/

// Listed all 998 classes.
$classes = array('cmh'=>'cmh.php', 'jnj'=>'jnj.php', 'dur'=>'dur.php', 'hze'=>'hze.php', ....);

// __AUTOLOAD TEST

$autoload = new timer();

function __autoload($name) {
  global $classes;
  require_once 'lots_o_files/'.$classes[$name];
}

foreach ($classes as $name => $file) {
  $class[] = new $name;
}

echo $autoload->pause();


// REQUIRE ONCE TEST
/*
$require = new timer();

foreach ($classes as $name => $file) {
  require_once 'lots_o_files/'.$file;
  $class[] = new $name;
}

echo $require->pause();
*/

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