Delete an array from array while in a foreach loop

[dlite922]

I can't believe I haven't come across this in all of my PHP programming (or my brain is currently locked)...I need to delete an array from an array that i'm traversing through with a foreach.

Read the comments:

 
$test1 = array("one","two","three"); 
$test2 = array("Four",true,"6"); 
$test3 = array("Seven",8,0x09); 
 
// a non-keyed array. (in actuality its a mysql result set)
$combined = array($test1,$test2,$test3); 
 
// Notice ampersand (foreach by reference)
foreach ($combined as &$test)
{
    //I do some other processing here. 
 
    // then attemp to remove the second $test2 for example
    if($test2[1] === true)    
    {
        // remove it!! 
        // HOW?        
 
    }
}
 
// this should print the arrays $test1 and $test3 but not $test2
print_r($combined); 
 

I think in the past I would have created a new array and pushed the values I wanted into that new one. Then I learned that I don't need to do that and use enough memory for ONE array and not mess with two copies.

Hooray, but now...how do I delete one of these values?


Thanks guys, I think I'm losing it today, so I apologize if this is a mere brain fart on my end.



Dan

[Markus]

unset() it?

[dlite922]

array_remove()

ha! I feel silly.



Dan

EDIT: what? link doesn't exist! *GASP* Oops!

It's because RQuadling at GMail dot com wrote it. (see unset comment section)

<?php
/**
  * array array_remove ( array input, mixed search_value [, bool strict] )
  **/
function array_remove(array &$a_Input, $m_SearchValue, $b_Strict = False) {
    $a_Keys = array_keys($a_Input, $m_SearchValue, $b_Strict);
    foreach($a_Keys as $s_Key) {
        unset($a_Input[$s_Key]);
    }
    return $a_Input;
}
?>
 

[dlite922]

@Markus
it is a very vague word in computer science unless I see where your finger is pointing.

If your referring to $test, then no that doesn't work. Even if you pass it by reference, it will just delete the reference (pointer) variable, not the actual var.

Try this:
Make a wrapper function for unset() and see if you can use it to erase variables.
I'll bet you my lunch money that it won't work. :)

hehehe
:P



Dan

[dlite922]

Working code using RQuadling's function:

 
function array_remove(array &$a_Input, $m_SearchValue, $b_Strict = False) {
    $a_Keys = array_keys($a_Input, $m_SearchValue, $b_Strict);
    foreach($a_Keys as $s_Key) {
        unset($a_Input[$s_Key]);
    }
    return $a_Input;
}
 
 
$test1 = array("one","two","three"); 
$test2 = array("Four",true,"6"); 
$test3 = array("Seven",8,0x09); 
 
// a non-keyed array. (in actuallity its a mysql result set)
$combined = array($test1,$test2,$test3); 
 
// Notice ampersand (foreach by reference)
foreach ($combined as &$test)
{
    //I do some other processing here. 
 
    // then attemp to remove the second $test2 for example
    if($test2[1] === true)    
    {
        array_remove($combined,$test2); 
    }
}
 
// this should print the arrays $test1 and $test3 but not $test2
print_r($combined); 
 
 

OUTPUT:

Array
(
    [0] => Array
        (
            [0] => one
            [1] => two
            [2] => three
        )
 
    [2] => Array
        (
            [0] => Seven
            [1] => 8
            [2] => 9
        )
 
)
 
 
 

If anybody thinks of another way without another traversal loop, let me know please.


Dan

[Atli]

<?php
$test1 = array("one","two","three"); 
$test2 = array("Four",true,"6"); 
$test3 = array("Seven",8,0x09); 
 
$combined = array($test1,$test2,$test3); 
 
foreach ($combined as $key => &$test)
{
    // Note how I use $test, rather then $test2 as you did.
    // (which didn't really make sense, btw)
    if($test[1] === true)    
    {
        unset($combined[$key]);
    }
}
 
print_r($combined); 
?>

Array
(
    [0] => Array
        (
            [0] => one
            [1] => two
            [2] => three
        )
 
    [2] => Array
        (
            [0] => Seven
            [1] => 8
            [2] => 9
        )
 
)

How 'bout that?