PHP - Different Ways To Write Foreach

Is this an acceptable way to instantiate classes?

//$_SESSION['product'] = {'ProductA', 'ProductB', ... 'ProductX'} 

$p = new $_SESSION['product']();

$p->save();

I am usually used to calling out classes explicitly where class name is not a variable but a hardcoded string.  Sometimes I use if/then/else in order to do this. Here it is a variable and it bothers me a little bit.   But PHP allows me to do this. Is this an acceptable latest & gratest modern PHP object oriented web technology technique or not ?

Hello, mates! I am new to PHP.

I want to store some data shared between requests. I know that it is possible with memcached and shared memory in Unix.

What ways to do it could you advice?

How could I realize background service in PHP?

Thank you.

 

This topic has been moved to Application Frameworks.

http://www.phpfreaks.com/forums/index.php?topic=355772.0

Ok. I know you can pass the object of a class as an argument. Example:


class A {
    function test() {
        echo "This is TEST from class A";
    }
}


class B {
    function __construct( $obj ) {
        $this->a = $obj;
    }

    function test() {
       $this->a->test();
    }

}


Then you could do:

$a = new A();
$b = new B($a);


Ok so that's one way i know of.

I also thought that you could make a method static, and do this: (assuming class A's test is 'static')

class B {
    function test() {
       A::test(); 
   }
}


But that is not working.


I'd like to know all possible ways of accomplishing this. Any hints are appreciated. thanks

I'm not sure if the title explains it very well, but here is an image of it. I am trying to figure out how to access the option selected (equal, not equal, etc.), along with its input box, for each column (the checkboxes on the right) selected. The purpose of this is to allow a non-programming administrator user to create a custom query to access information. I can find out which checkboxes are selected no problem, but finding the accompanying drop-down option and input box is difficult for me. How do I do this?

If you have a suggestion on how to change it, I'm very open. Thank you in advance!



Code: [Select]
if(!isset($_POST['submit']))
{
echo "
<form method='post'>
<table>
 <tr>
  <td valign='top'>SELECT</td>
  <td valign='top'>
   <table>";
 
// LIST ALL COLUMNS IN A TABLE
$result = mysql_query("SELECT * FROM table_name") or die(mysql_error());
$rowcount=mysql_num_rows($result);
$y=mysql_num_fields($result);
for ($x=0; $x<$y; $x++)
{ echo "
    <tr>
<td>
  <input type='checkbox' name='fields[]' value='".mysql_field_name($result, $x)."'>".mysql_field_name($result, $x)."
     </td>
</tr>"; }
 
   echo "
   </table>
  </td>
  <td valign='top'>FROM allocations</td>
  <td valign='top'>WHERE</td>
  <td>
   <table>";
   
// LIST ALL COLUMNS IN A TABLE
$result = mysql_query("SELECT * FROM table_name") or die(mysql_error());
$rowcount=mysql_num_rows($result);
$y=mysql_num_fields($result);
for ($x=0; $x<$y; $x++)
{ echo "
    <tr>
<td>
  <input type='checkbox' name='column[]' value='".mysql_field_name($result, $x)."'>".mysql_field_name($result, $x)."
</td>
<td>
  <select name='operator[]'>
          <option value='='>equals</option>
          <option value='<>'>does not equal</option>
          <option value='>'>greater than</option>
          <option value='<'>less than</option>
          <option value='>='>greater than or equal to</option>
          <option value='<='>less than or equal to</option>
          <option value='LIKE'>is like</option>
         </select>
</td>
     <td><input type='text' name='criteria[]'></td>
</tr>"; }

   echo "
   </table>
  </td>
  <td valign='top'><input type='submit' value='Process Query' name='submit' class='submit'></td>
 </tr>
</table>
</form>";
}
else
{
 echo "<b>Fields to edit:</b> ";
foreach ($_POST['fields'] as $fields) {
echo $fields,", ";
}

 echo "<br><br>";
 echo "<b>Columns to query:</b> ";
foreach ($_POST['column'] as $columns) {
echo $columns," HERE IS THE SPOT, ";
}
}

I do know how to do this but I am curious about whether or not there is a "preferred" way to do this. I know there are a couple ways to use a class (I'll call Alpha_Class) within another class (I'll class Beta_Class)

Let's say we have this simple class (Beta_Class):

class beta {
    function foo(){
    
    }
}


If I wanted to use the Alpha Class within the Beta Class, I could any number of things. For example:

class beta {
    function foo(){
        $this->alpha = new alpha;
        //$this->alpha->bar();
    }
}


Or you could simply use the $GLOBALS array to store instantiated objects in:

$GLOBALS['alpha'] = new alpha;
class beta {
    function foo(){
        //GLOBALS['alpha']->bar();
    }
}


You could even declare Alpha_Class as a static class and thus would not need to be instantiated:

static class alpha {
    static function bar(){}
}

class beta {
    function foo(){
        //alpha::bar();
    }
}


Those are the only ways I can think of right now. Are there any other ways to accomplish this? I was wondering which way is the best in terms of readability and maintainability.

Hello dear friends,

let say we have text file (file.txt)

i wanna php code that makes me able to write some text to this text file (file.txt) then save it as zipped file to be (zipped.zip)

1) I know how to write , will use this

Code: [Select]
<?php 
 $File = "file.txt"; 
 $Handle = fopen($File, 'w');
 $Data = "Hello phpfreaks\n"; 
 fwrite($Handle, $Data); 
 $Data = "Hello World\n"; 
 fwrite($Handle, $Data); 
 print "Data Written"; 
 fclose($Handle); 
 ?>
now the (file.text) will be saved with the following text

Code: [Select]
Hello phpfreaks
Hello World
Now the question which i do not know  how to save it as zipped file not text file ? OR save it normally as text file (file.txt) then create zipped file of it (zipped.zip)

thank you so much for help 

I want to create a xml-based rss which is readable by RSS readers
Code: [Select]
<?xml version="1.0"?>
<rss version="2.0">
  <channel>
    <title>Title</title>
    <link>http://link.com/</link>

How I can write php strings from a php file into it as
Code: [Select]
<item>
      <title><? echo $title ?></title>
      <link><? echo $link ?></link>
      <description><? echo $description ?></description>
      <pubDate><? echo $date ?></pubDate>
      <guid><? echo $id?></guid>
    </item>

hello

how would i write,

if $a has 1 or more of $b do something ?
for example

Code: [Select]

if($a >1 $b){
do something
}else{
do nothing
}


or >2
or >3

etc...

thanks

Code: [Select]
if (file_exists("images/".$id."/img01.jpg")) { echo "<a href=\"/v1/images/".$id."/img01.jpg\" rel=\"lightbox\"><img src=\"/v1/images/".$id."/thumb01.jpg\" class=\"img\" border=\"0\" width=\"60\" height=\"60\"></a>&nbsp;"; }
if (file_exists("images/".$id."/img02.jpg")) { echo "<a href=\"/v1/images/".$id."/img02.jpg\" rel=\"lightbox\"><img src=\"/v1/images/".$id."/thumb02.jpg\" class=\"img\" border=\"0\" width=\"60\" height=\"60\"></a>&nbsp;"; }
if (file_exists("images/".$id."/img03.jpg")) { echo "<a href=\"/v1/images/".$id."/img03.jpg\" rel=\"lightbox\"><img src=\"/v1/images/".$id."/thumb03.jpg\" class=\"img\" border=\"0\" width=\"60\" height=\"60\"></a>&nbsp;"; }
if (file_exists("images/".$id."/img04.jpg")) { echo "<a href=\"/v1/images/".$id."/img04.jpg\" rel=\"lightbox\"><img src=\"/v1/images/".$id."/thumb04.jpg\" class=\"img\" border=\"0\" width=\"60\" height=\"60\"></a>&nbsp;"; }
if (file_exists("images/".$id."/img05.jpg")) { echo "<a href=\"/v1/images/".$id."/img05.jpg\" rel=\"lightbox\"><img src=\"/v1/images/".$id."/thumb05.jpg\" class=\"img\" border=\"0\" width=\"60\" height=\"60\"></a>&nbsp;"; }
if (file_exists("images/".$id."/img06.jpg")) { echo "<a href=\"/v1/images/".$id."/img06.jpg\" rel=\"lightbox\"><img src=\"/v1/images/".$id."/thumb06.jpg\" class=\"img\" border=\"0\" width=\"60\" height=\"60\"></a>&nbsp;"; }
if (file_exists("images/".$id."/img07.jpg")) { echo "<a href=\"/v1/images/".$id."/img07.jpg\" rel=\"lightbox\"><img src=\"/v1/images/".$id."/thumb07.jpg\" class=\"img\" border=\"0\" width=\"60\" height=\"60\"></a>&nbsp;"; }
if (file_exists("images/".$id."/img08.jpg")) { echo "<a href=\"/v1/images/".$id."/img08.jpg\" rel=\"lightbox\"><img src=\"/v1/images/".$id."/thumb08.jpg\" class=\"img\" border=\"0\" width=\"60\" height=\"60\"></a>&nbsp;"; }
if (file_exists("images/".$id."/img09.jpg")) { echo "<a href=\"/v1/images/".$id."/img09.jpg\" rel=\"lightbox\"><img src=\"/v1/images/".$id."/thumb09.jpg\" class=\"img\" border=\"0\" width=\"60\" height=\"60\"></a>"; }
This code works but it just seems a bit tedious. I may also include up to 20 images to check if they exist. Better way to do this?

I'm trying to right this code

Code: [Select]
<option <?php echo $pageName == 'Home' ? 'selected="selected"' : ''; ?>>Home</option>
In PHP

Here is my attempt I know it's wrong but I can't get it to work.

echo "<option> {$row["menuName"]} " == " {$row["menuName"]} " ? " 'selected=\"selected\"'" : " '' > {$row["menuName"]}</option>";

Instead of the == 'home' i want to echo the menuName and the same goes for at the end of the >

In the html, in the source code this is all I get

Code: [Select]
<select name="menuName" value="options">




'' </option> '' </option>            </select>

Thanks for any help.

Hi, I have a form on my homepage which on submit sends the data to my email.  I need to know if it it possible to include in the form a read only field containing the refererid in the URL

(for instance, if someone were to have visited my homepage by entering; http://www.mypage.com/?refererid=7777, could I capture that 7777 in one of the form fields so that when the form is submitted I recieve the refererid?)

Thanks, any help appreciated...

I am trying to create a query that selects results from a table called matches.  The results from this table must be based on whether or not there are results from another table called match_results.  The results from the match_results table must be based on whether or not the row has either a home_id equal to the current team id, or a visitor_id equal to the current team id.  If the current team id is equal to the home_id of the result from the match_results table, then the home_score must be greater than the visitor_score.  If the current team id is equal to the visitor_id of the result from the match_results table, then the visitor_score must be greater than the home_score. 

In short, I am trying to make a query that finds a team's match record(wins and losses).  If the result from the matches table doesn't have any results from the match_results table with the same match id, then it hasn't been played it.  I hope this makes sense.  Is there any way to do this in one single query?





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Hi all,

I have fwrite() writing to a text file called 'numbers.txt'. The text file content is "23".

I learn't fwrite() from the manual, so did:

f$fp = fopen('/opt/numbers.txt', 'w');
fwrite($fp, '1');
fclose ($fp);


I have used fwrite() to try and make the file content "123", but fwrite() writes over the content of the file, resulting in it just containing "1".

I couldn't find anywhere about writing into, rather over, and hoping someone could please help me out.

I have a web site where users can gain points, when they use my site. For example, if the user spends $10.00 then the user will get 10 points.
In my web site there is a list of 10 retails (name). When the user clicks the link it will redirect to retailers website, where user can buy items.
How can I find out how much the user has spent on the retailer?
Thank you.