PHP - Reading Xml Variables & Writing Variables To Xml Variable

Hi everyone.
I am David and I am new to web design and php. I am following a Lynda.com tutorial on php and sql.
I have reached a certain point in the tutorial where I am reading values back from my database in to a php variable. The variable is holding an array data type and I am accessing the element within the array.

I want a HTML select control and 2 radios buttons to reflect the values in the database.
Therefore the Select control should read a numeric value of type int and the radio buttons are reflecting either a 1 or a 0.

Firstly the code for the Select control uses a for loop to count the array elements and load the count into the Select control. The example uses php mixed with html. The for loop will count the number of element and add a number to the select control. The an If statment is used to make a decision if the count variable equals the value in the array element $sel_subject['position'] then select that value. This does not happen, and I can not seem to get it to work.

                                           <p>Position:
                  <select name="position">
                     <!--use a php block so as to use some php variables -->
                     <!--Use these variables with the get_all_sublects function. -->
                     <!-- This function will return all the dataset -->
                     <?php
                        $sel_subject = get_all_subjects();
                        //Then use the mysql fuction to retuen the numberic value of all the rows.
                        $subject_count = mysql_num_rows($sel_subject);
                        //$subject_count + 1 becauce we are adding a subject
                        for($count=1; $count <= $subject_count+1; $count++)
                        {
                           echo "<option value=\"{$count}\"";

                           if ($sel_subject['position'] == $count)
                           {
                              echo " selected";
                           }
                           
                           echo ">{$count}</option>";
                        }
                     ?>
                  </select>
               </p>

Secondly the radio buttons do something similar in that i want them to reflect the value in the array element. If a 1 then True and so be checked or 0 and so false and so be unchecked.

                                             <p>Visible:

                  <input type= "radio" name= "visible" value= "0"
                  <?php if ($sel_subject['visible'] == 0)
                  {
                     echo 'checked=" checked"';
                  }
                  ?>
                  >No</input>
               &nbsp;
                  <input type= "radio" name= "visible" value= "1"
                  <?php if ($sel_subject['visible'] == 1)
                  {
                     echo 'checked=" checked"';
                  }
                  ?>
                  >Yes</input>
               </p>

Again this doesn't work either. So in summary, I cant get the php code to affect the html form controls and relay the stored data to the user.
I have been racking my brain for days and getting no where. Please can anyone help me with this.

I would be very grateful.
All the best Irish_Dave

Hello everyone,

I can get Test 2 to successfully operate the if statement using a variable variable.

But when I try the same method using a session variable (Test 1) the if statement is not executed. Please could you tell me why the if statement in Test 1 is not being executed?

Code: [Select]

<?php
# TEST 1
$_SESSION[test_variable] = "abcd";
$session_variable_name = "_SESSION[test_variable]";
if ($$session_variable_name == "abcd")
{
echo "<br>line 373, abcd<br>";
}

# TEST 2
$test_variable = "efgh";
$test_variable_name = "test_variable";
if ($$test_variable_name == "efgh")
{
echo "<br>line 379, efgh<br>";
}

?>
Many thanks,

Stu

I need to use a variable variable.

I need:

$row['pos_1']
$row['pos_2']

to use $i for the numbers

I have this:

if ($row{[pos_.$i]} == 'ad')

which is throwing an error

Quote

Parse error: syntax error, unexpected '['



Any ideas?

Thanks!

I am not sure how to do the below, would variable variables be the way -- those are a new and confusing thing for me :-/

i have an array:

$contactData = array('admin_firstName' => 'John', 'admin_lastName' => 'Smith', 'user_firstName' => 'Betty', user_lastName => 'Jones'); 

I have a function that little function that looks like this:

function compare($contactSet, $var, $value){

global $contactData;

    $key = $contactData . "['" . $contactSet . "_" . $var ."']";
    //above doesnt work, but you can see how the array key is constructed
    
if ($key == $value) { 
// So, if the array key varied it would look like:
// if ($contactData['admin_firstName'] == $value

echo "same";

} else {

echo "different";

}

}


and then I want to call it like this:
compare('admin', 'firstName', 'John'); //would echo "same";

Any help is greatly appreciated. I have often wanted to use variable variables, or whatever this would be called, but don't know to pull it off. I can add another example if this wasnt clear enough.

Question about variable variables and using session variables for them. O.K. So if I have:

$foo = 3;
$_SESSION['bar'] = "foo";

$$_SESSION['bar']  should equal the value of $foo, however I can't get it to work. Can someone tell me what I am doing wrong..... is it formatting???

Thanks,
Thomas

If I knew what to call it I could have searched it.  So I will just explain.

I have a form that is pulling from a database to build the following.
echo <input name='$row[id]' type='text' id='$row[id]' size=2>;

This will build a page that has this
<input name='22' type='text' id='22' size=2>
<input name='54' type='text' id='54' size=2>

This part works great.  The problem is when I try to add it to the database.  How can I insert variables that I don't know the names of?  They will be something like $_POST[22]   $_POST[54] and so on.  I hope someone can understand my jibberish.

I am sure there is a WAY better way to do this.

I know how to use $$ and ${} to use variable variables, but how would I get the same functionality out of a variable that is storing an object name?

I have a function that is passed the name of an array of objects.  As you can guess, that name will change based on which portion of the program is calling
the function.  How would I use variable variables of objects in this instance?  Would it just be:

Code: [Select]
$this->${$objArrayName}->threadName = etc;
?

To make sure I'm not being misunderstood, I have 3 arrays of objects (replies, mainThreads, and stickies) and depending on which name I pass the function, I want it
to use $this->replies OR $this->mainThreads OR $this->stickies to apply properties of those objects to.

Thanks for any help.

-Adam

I've been trying for days to get this simple 1990's code to work. It won't work. Now, I don't even want to get it to work, because it's crappy ugly 1990's code...

Is there an elegant way to accomplish this? (I just want to be able to manually override the default catalog prices as needed.)

<?php
//default catalog prices:
$sku = "123456";
$price = "5.99";
if(isset($_POST[$sku])) { // if form submitted, and
	if( ${$_POST[$sku]} != $price) { //...and I manually changed price
	$price = ${$_POST[$sku]}; //...then change price to what I input
	}
}
echo '<form name="form1" method="post" action="Crappy1990sCodePage.php">';
echo '<input type="text" name="'.$sku.'" value="'.$price.'">';
echo '<input type="text" name="'.$sku.'" value="'.$price.'">';// (same sku may be listed twice)
echo '<input type="submit" class="no_class_its_the_90s_remember">'
echo '</form>';
?>

Thank you 😀

Edited July 25, 2020 by StevenOliver

Is it possible to split a variable into 2 variables?


///  I have this sentence
$item = "Below Telegraph Hill, Smallwork Canvas Edition";

/// And I want to be able to do this
$item = "Below Telegraph Hill" ;
$medium = "Smallwork Canvas Edition";


Is it possible to find the comma in a string, and remove the comma & everything before or after it? Any recommendations would be appreciated.

This topic has been moved to Other Libraries and Frameworks.

http://www.phpfreaks.com/forums/index.php?topic=357370.0

I'm not versed in PHP OOP and I have some code that I need to echo out onto a page. I don't know what the meaning of $ct->something is in this code. Is this an array of some type? How do I echo out the $ct->title onto another page? Use a function call? I just don't know what all of the $ct variables are and how to get to them. Any help is appreciated.
Code: [Select]
function current_theme_info() {
    $themes = get_themes();
    $current_theme = get_current_theme();
    if ( ! isset( $themes[$current_theme] ) ) {
        delete_option( 'current_theme' );
        $current_theme = get_current_theme();
    }
    $ct->name = $current_theme;
    $ct->title = $themes[$current_theme]['Title'];
    $ct->version = $themes[$current_theme]['Version'];
    $ct->parent_theme = $themes[$current_theme]['Parent Theme'];
    $ct->template_dir = $themes[$current_theme]['Template Dir'];
    $ct->stylesheet_dir = $themes[$current_theme]['Stylesheet Dir'];
    $ct->template = $themes[$current_theme]['Template'];
    $ct->stylesheet = $themes[$current_theme]['Stylesheet'];
    $ct->screenshot = $themes[$current_theme]['Screenshot'];
    $ct->description = $themes[$current_theme]['Description'];
    $ct->author = $themes[$current_theme]['Author'];
    $ct->tags = $themes[$current_theme]['Tags'];
    $ct->theme_root = $themes[$current_theme]['Theme Root'];
    $ct->theme_root_uri = $themes[$current_theme]['Theme Root URI'];
    return $ct;
}

Say I have two variables like below. I basically want to select one of them, but through random choice. How do I do that?

$orange = 'Orange';
$apple = 'Apple';

 

i have Created a Session  with this code $_SESSION['USER_NAME'] = trim($_POST['username'])


How can i access the $_SESSION['USER_NAME'] in other Pages ;

and will this code for $var = $_SESSION[USER_NAME] 

can i get the SESSIOn value in " $var"  variable ??

Hello,

If I have this string:

$tags="baseball glove face" (this can vary from 1 to 15 different words)

how would i loop through and divide these into different

$tag1=baseball
$tag2=glove
$tag3=face
.. and so on (if more words)

Thanks for help

I am trying to achieve something that appears simple but  I spent few hours in vain



Quote

$tag1 = '<a href="layout_m.php?k='.$k.'&name='.$name.'&type='.$type.'">';

if ($k=="1") {$history = ucfirst($name) . ' - ' . $tag1 . $k .'</a>'  ; }
else {$history = $history . ' - '. $tag1 . $k . '</a>' ;}

print $history;



This is part of a page which is involved in passing data by forms or/and URL (eg layout.php?k=1) and the display of the page depends on k.


At k=1,(first page)  things are ok [Joe -  <a href="layout_m.php?k=1&name=Joe&type=genus"> 1 </a>]

but on passing to the next page, the output is not as desired

part of the variable is escaped out on the browser and breaks the variable content


View source gives this:
Joe -  <a href= -  <a href="layout_m.php?k=3&name=Joe&type=genus"> 1 </a>

while I want:

Joe -  <a href="layout_m.php?k=1&name=Joe&type=genus"> 1 </a> -  <a href="layout_m.php?k=3&name=Joe&type=genus"\> 3 </a>

What I achieve to do is a simple history based on an accumulation of k

EG Joe - 1 - 3 - 5 - 6 - 8  Where each number (k) is linked and when pressed each go to the corresponding keypage.