I want to execute following code to trace array value in drupal module. But it's not working. In PHP my code works fine but shows notice in Drupal. How to write foreach in Drupal module?
foreach($submission as $s) {
foreach ($s as $a) {
echo $sid = $a[1]->sid;
}
}
Notice: Undefined offset: 1 in webform_submission_publish() (line 149
of
Because you have an undefined offset, the code will break.
You can prevent this kind of mistake by checking if the array is set.
foreach ($submission as $s) {
foreach ($s as $a) {
if (isset($a[1])) {
echo $sid = $a[1]->sid;
}
}
}
Documentation:
http://php.net/manual/en/function.isset.php
Surely, you can check for the index 1 before using it, but it's a bit odd to access the value indexed by 1, which is likely to be the second element in the array. You can get the first element using the PHP reset() function. So, the echo line would read
echo $sid = reset($a)->sid;
Related
I do a select and get several results in array but I need to get the correct value for each step and set up a condition.
$step = DB::table('records')->where('id_user',$userId)->get();
for($i = 0; $i < count($step); $i++)
{
echo $step[$i]->id_step;
}
Id_step returns me values for each step where on the blade I need to get and see if id_step = 1 is true id_step = 2 is true.
This for is returning me only one value and it has 3 records in the table.
First of all. After a select you get an instance of Eloquent\Collection
Not an array.
So that said to loop do this:
$steps = DB::table('records')->where('id_user',$userId)->get();
foreach($steps as $row) {
echo $row;
}
Since you are familiar with arrays do this:
$steps->toArray();
Now your result is an array
Working insert in view this code.
#for($i = 0; $i < count($step); $i++)
#if($step[$i]->id_step == 2)
working
#else
not working
#endif
#endfor
I am take all field in for-each loop and take the difference of each two column
enter image description here
The above image 'tech_strt_km' is field name and take the difference of 122-22 and 200-122 how find these difference and store there values in another variyable i am using foreach loop for print these numbers
<?php
foreach($pexpn as $row) {
echo $row->tech_strt_km; ?><br>
} ?>
Any way to find the difference of same column
please help me !!
This should work fine. We add one to the current key to get the next value so we can subtract it from the current value, then we save these differences in an array diff for later usage.
$arr = array('22', '122', '200');
$diff = array();
foreach ($arr as $k => $v) {
if (!isset($arr[$k + 1])) {
// if we don't have a next item we are done
// break from foreach
break;
}
// abs only necessary if we expect negative differences and
// if we don't want that --- store differences in array
// for later usage
$diff[] = abs($arr[$k + 1] - $v);
}
print_r($diff);
Array ( [0] => 18 [1] => 1 )
how i can get only 0 index value?. I am using this code in codeigniter. Can any one help?. Is this possible with for each loop so it access all indexes but show only zero index?
foreach($m as $m)
{
echo $m->['0'];
}
If you want only first index then you don't need to foreach loop
Just write:
echo $m[0];
And if you want all index of array then:
foreach ($m as $key => $value) {
echo $key;
}
Try this:
print_r($m[0]);
or
foreach($m as $m)
{
echo $m['0'];
}
Following is the code to get value of index 0
//$array variable declared containing multiple values
$array=array('0' =>"first value",'1' =>"second value",'2' =>"third value" );
echo "<pre>";
print_r($array); // helps in printing the value key and value
//iterating through each values in the array
foreach ($array as $key => $value) {
if($key==0) //checks if key is 0
{
echo $value; //prints the value in key 0
}
}
I tried to get a umat_id with this SQL query :
SELECT umat_id FROM msumat WHERE nama = $nama
I converted this SQL query into CI's Active Record :
$this->db->select('umat_id');
$terdaftar = $this->db->get_where('msumat', array('nama' => $nama));
So this query should return a string (example : "John").
But I got an error when I tried to echo it :
Object of class CI_DB_mysql_result could not be converted to string
I have tried something like this : echo (string)$terdaftar;, but it's not working.
All I want is to echo "John"
EDIT
Just said I want to insert "John" into a variable. How to do that?
$john = ????
As some of the users already pointed the solution, I'm only explaining why you did get this error so you can understand better the querying results that codeigniter gives.
This error:
But I got an error when I tried to echo it : Object of class
CI_DB_mysql_result could not be converted to string
Happens because you were trying to echo an object.
This piece of code
$terdaftar = $this->db->get_where('msumat', array('nama' => $nama));
Will return an object, this object will have information about the query you've done.
With this object you can get the result(rows) as objects doing this:
$results = $terdaftar->result();
Or you if you feel more comfortable with arrays you can return the results(rows) as an array doing this:
$results = $terdaftar->result_array();
You can also get the number of results doing this:
$number_results = $terdaftar->num_rows()
And this is just an example you can read more about the results here
http://ellislab.com/codeigniter/user-guide/database/results.html
EDIT
A better explanation: imagine that we use the result_array() function to get the result in a pure array format:
$results = $terdaftar->result_array();
Now your variable $results is an array, to iterate through it and get the data you want you'll do something like this:
foreach ($results as $key => $row) {
//the row variable will have each row of your database returned by your query
//so if you want to access a field from that row,
//let's say for example the name field. You would do something like this
if($row['name']=='John')
echo $row['name'];
}
Try:
$this->db->select('umat_id');
$terdaftar = $this->db->get_where('msumat', array('nama' => $nama));
foreach ($terdaftar->result() as $row)
{
echo $row->umat_id;
}
Read the documentation for more information.
Try this:
$this->db->select('umat_id');
$terdaftar = $this->db->get_where('msumat', array('nama' => $nama));
$row = $terdaftar->row_array();
$your_variable = $row['umat_id']; /*Here comes your john*/
I am creating an order cart.
On the page that displays the cart, it checks if a value stored in the session $order corresponds with an id of a row in a mysql table. If this match exists, then the corresponding row is returned.
Within this process, I am trying to retrieve the quantity value stored in the session $quantity that corresponds to the id of the row in the table.
Each value in $order and $quantityis assigned a name, which is the id of the item they were added from.
This is the code that adds the order to the cart:
if (isset($_POST['action']) and $_POST['action'] == 'Order')
{
// Add item to the end of the $_SESSION['order'] array
$_SESSION['order'][$_POST['id']] = $_POST['id'];
$_SESSION['quantity'][$_POST['id']] = $_POST['quantity'];
header('Location: .');
exit();
}
This is the code on the cart page:
foreach ($order as $item)
foreach ($quantity as $amount)
{
mysql_data_seek( $productsSql, 0); //<- this line, to reset the pointer for every EACH.
while($row = mysql_fetch_assoc($productsSql))
{
$itId = $row['id'];
$itDesc = $row['desc'];
$itPrice1 = $row['price1'];
if ($item == $itId)
{
$pageContent .= '
<tr>
<td>'.$itDesc.'</td>
<td>'.if ($item[''.$itId.''] == $amount[''.$itId.'']) {echo $amount}.'</td>
<td>R'.number_format($itPrice1*$amount, 2).'</td>
</tr>
';
}
}
}
This row is producing a syntax error:
<td>'.if ($item[''.$itId.''] == $amount[''.$itId.'']) {echo $amount}.'</td>
What is the problem here for starters?
Secondly, how would I need to do to accomplish the task that I am facing?
Any input on this would be greatly appreciated!
Could you try this?
<td>'.($item[$itId] == $amount[$itId] ? $amount : '').'</td>
This is a ternary operator, look at http://en.wikipedia.org/wiki/Ternary_operation
You can't simply add conditional statements like that while you're building a string.
You can do this, however
<td>' . ($item[$itId] == $amount[$itId]) ? $amount : null . '</td>
but you should use a more legible method.
Another issue you may get is if $amount is an array, you won't be able to print it as a string. If, however, $amount is an object with ArrayAccess interface, you can print it with the __toString() method; but that's another story.
The code for creating the cart page has several issues.
You walk over items and over quantities, which will probably give you duplicate outputs.
$item is a plain string, so I wonder what $item[$itId] is supposed to do?
You walk over your complete result set several times which actually is not necessary. I really hope that "$productSql" isn't a "select * from product", otherwhise this might get REAL slow in production mode.
I suggest creating a good SQL for getting the data and using this as a basis for filling the page:
// note this has SQL-injection issues, so you really need to make sure that $order contains no crap
$productsSql = mysql_query("select * from product where id in (".join($order, ',').")");
// you now have a result set with all products from your order.
while($row = mysql_fetch_assoc($productsSql))
{
$itId = $row['id'];
$itDesc = $row['desc'];
$itPrice1 = $row['price1'];
// session contains the quantity array mapping ID -> Quantity, so grab it from there
$itQuantity = $quantity[$itId];
// finally calculate the price
$itPrice = number_format($itPrice1*$itQuantity, 2);
// now you have all data for your template and can just insert it.
// if you use double quotes you can put the $xyz into the string directly
$pageContent .= "
<tr>
<td>$itDesc</td>
<td>$itQuanty</td>
<td>R $itPrice</td>
</tr>
";
}