How to filter out even index values with array_filter?

Question

I'm trying to filter out values by their even index numbers, but it isn't going well. $date is being return as the full array but with the last index missing. Is this because I'm using explode()?

Here's my code;

$route = "Dest A:0900:Dest B:0930:Dest C:1000";

$route_array = explode(":", $route);

foreach($route_array as $key){
    if(!($key & 1)){
        $date[] .= $key;
    }
}
return $date;

I assume that the reason is because you only want the times? — Nic Wortel
– Nic Wortel, Commented Nov 8, 2012 at 13:52
Well, ideally I'd like to seperate the destination from the times. I actually think I've figured out how to do it now that I've asked! Will post shortly. Maybe there's a more simple way... — mrbubbles
– mrbubbles, Commented Nov 8, 2012 at 13:53

Greg · Accepted Answer · 2012-11-08 13:54:03Z

1

your loop should look like this

foreach($route_array as $k=>$key){
    if(($k+1)%2 == 0){
        $date[] = $key;
    }
}

answered Nov 8, 2012 at 13:54

Greg

1,0138 silver badges14 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Nic Wortel · Accepted Answer · 2012-11-08 13:55:52Z

1

I believe this is the problem:

foreach($route_array as $key)

You call the variable $key, but it will actually contain the value of that array element.

Instead, you should do the following:

foreach($route_array as $key => $value)

An then check wether the $key is odd or even. Now $value will contain either the destination or the time.

answered Nov 8, 2012 at 13:55

Nic Wortel

11.4k7 gold badges63 silver badges79 bronze badges

1 Comment

mrbubbles Over a year ago

Thanks for answering NicNLD. I ended up doing this in my final answer below.

mrbubbles · Accepted Answer · 2012-11-08 14:00:29Z

0

Thanks for the answers guys...

Okay, so five minutes later I had a light bulb moment and came up with a solution;

$route = "Dest A:0900:Dest B:0930:Dest C:1000";
$route_array = explode(":", $route);

foreach($route_array as $key => $value){
    if(!($key & 1)){
        $date[] .= $route_array[$key];
    }
}
return $date;

answered Nov 8, 2012 at 14:00

mrbubbles

6976 silver badges20 bronze badges

2 Comments

Nic Wortel Over a year ago

This might work. However, the value of $route_array[$key] is already stored in $value, so why do you look it up again?

mrbubbles Over a year ago

Yeah that's true, I've now amended my code to assign $value rather than $route_array[$key]. I'm a bit of a noob with PHP - thanks for the heads up.

Collectives™ on Stack Overflow

How to filter out even index values with array_filter?

3 Answers 3

Comments

1 Comment

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

1 Comment

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related