some problem in array_search and the use of unset

tech · 06-27-2009, 07:56 PM

dear friend..

php Code:

<?php
$x=array("r","a","f","c","s");

shuffle($x);

$z=array_search("c",$x);
unset($x[$z]);
print_r($x);
?>

PHP Code:


			
/*when i try to execute this code its working perfect.You need to notice one point in the output while removing the element-*/



Array

(

    [0] => s

    [1] => a

    [2] => r

    [4] => f

) 



    [0] => s

    [1] => a

    [2] => r

    [3]=> Nothing here

    [4] => f



/*You see that there is no index-3 in the array. Not acceptable. You have done great work.so now i wanted to use this function*/



array_remove_value($arr, $value){

return array_diff($arr, array($value));

}



/*but i am unable to use it in my code..please help me how to use it.here is my code*/

php Code:

<?php
function extract1($this)
{
//if i have a parent

    if($this->parent)
    {
        try
        {     //if i can be removed from parent's contents array;
        array_splice($parent->content,$this);// here is doubt.
            }
            catch(Exception $e)
            {
                }

         }
        $lastChild=$this->lastRecursiveChild();
        $nextElement =$lastChild->next;

        if($this->previous)
         {
        $this->previous->next=$nextElement;
     }
        if($nextElement)
         {
        $nextElement->previous=$this->previous;
     }
        $this->previous=null;
        $lastChild->next = Null;
        $this->parent = Null;
        if ($this->previousSibling)
    {
        $this->previousSibling->nextSibling = $this->nextSibling;
        }
    if ($this->nextSibling)
    {
        $this->nextSibling->previousSibling = $this->previousSibling;
    }
    $this->previousSibling = $this->nextSibling = Null;
        return $this;
}
?>

please check try block.
thanks

Note added by: Codefreak, please format your code,
Prettifying Pasted Code on TalkPHP

tony · 06-27-2009, 09:10 PM

I can't see in the second code where you are using your function array_remove_value.
Also what is the variable $parent coming from, maybe from $this->parent? (which by the way you can't use $this since it is a reserve word and its used public/private/protected methods of classes, can't use it to name parameters).

P.D. It would help if you edit the post and wrap the code snippets in PHP of CODE tags. it would be easier to read for everybody.

tech · 06-27-2009, 09:26 PM

ya i haven't use array function bcoz i dont know how to use it.i'll tried with array_splice and unset but its not correct.the main thing I am facing to use this function.
one problem of using unset what i explained ...please check my try and catchwhere i used array_splice which is not proper..so please tell me how "i" can be removed from parent content array.here "i" have a parent.or can we use array_remove to solve this problem...

tony · 06-27-2009, 10:29 PM

array_splice is used to replace content and it doesn't throw an exception, so there is no need to put it on a try-catch block.

to delete an element (the value and the index too) you can use this:

PHP Code:


			
$arr = array('4', 'sdf', 'seoij', 'sodifj');



$arr = array_values(array_diff($arr, array('sdf')));

so you can make it a function:

PHP Code:


			
function array_remove($arr, $value){

    return array_values(array_diff($arr, array($value)));

}



//then you can use this function like this

$arr = array('4', 'sdf', 'seoij', 'sodifj');

$arr = array_remove($arr, 'sdf');

print_r($arr);

/*

Array

(

    [0] => '4'

    [1] => 'soeij'

    [2] => 'sodifj'

)

*/

Now in the example you gave, you are trying to apply this function to an array that is part of an object. I don't know how to help you on that since I don't know how the class of that object is structured.
But I hope this helps.

codefreek · 06-27-2009, 10:59 PM

Please use php tags or highlight tags.
Thank you.

sketchMedia · 06-27-2009, 11:26 PM

Quote:

it doesn't throw an exception, so there is no need to put it on a try-catch block.

I believe I've told him this before, good to see the effort that went into typing it paid off!!

PHP Parse error: parse error,syntex error unexpected ',' expectingT_STRING in my code

Kalle · 06-28-2009, 04:51 AM

PHP doesn't use exceptions as general error handling, however using the builtin ErrorException class you can turn that into reality, but only if PHP emits an error:

php Code:

<?php
/* This is the call back for set_error_handler */
function exception_error_handler($severity, $message, $file, $line )
{
    throw new ErrorException($message, 0, $severity, $file, $line);
}

/* Set the new error handler */
set_error_handler('exception_error_handler');

/* Trigger exception, because this function needs more than 0 parameters */
try
{
    min();
}
catch(ErrorException $e)
{
    switch($e->getSeverity())
    {
        case(E_WARNING):
        {
            printf('Warning: %s in %s on line %d', $e->getMessage(), $e->getFile(), $e->getLine());
        }
        break;
        /* ... same for other error levels thats catchable here ... */
    }
}
?>

and testing:

Code:

C:\> php test.php
Warning: min() expects at least 1 parameter, 0 given in C:\test.php on line 14