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Can there be a default array value in php
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kpa4941


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Joined: 23 Nov 2010
Posts: 84
Location: Carrollton, Texas
Posted: 25 Jun 2011 04:57:59 pm    Post subject: Can there be a default array value in php
Say I have an array that looks like this:

Code:
$array = array(0,1,2,3);


Is it possible to have a default array value so that if you attempt to access a value outside of the array, it returns an error message?


This code would return the default value since the array element 10 doesn't exist.

Code:
echo $array[10];


Code:
// Default value to return
echo "The value doesn't exist.";

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Last edited by kpa4941 on 26 Jun 2011 01:14:19 am; edited 1 time in total
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KermMartian


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Joined: 14 Mar 2005
Posts: 55759
Location: Earth, Sol, Milky Way
Posted: 26 Jun 2011 12:45:38 am    Post subject:
You could implement it like this:


Code:
$default_array_dne = "[MISSING VALUE]";

function StrictArrayGet($array,$key) {
    global $default_array_dne;
    return array_key_exists($key,$array)?$array[$key]:$default_array_dne;
}

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kpa4941


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Joined: 23 Nov 2010
Posts: 84
Location: Carrollton, Texas
Posted: 26 Jun 2011 01:18:36 am    Post subject:
Ok, I see how that would work, but is there such thing as a default array though, kind of like switch/case?

If not, I guess that this would be the best solution.
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KermMartian


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Joined: 14 Mar 2005
Posts: 55759
Location: Earth, Sol, Milky Way
Posted: 26 Jun 2011 01:54:53 am    Post subject:
kpa4941 wrote:
Ok, I see how that would work, but is there such thing as a default array though, kind of like switch/case?

If not, I guess that this would be the best solution.
You could restructure it as a conditional instead of a function, but I don't think PHP has a more elegant way to do this (at least that I know of).
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kpa4941


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Joined: 23 Nov 2010
Posts: 84
Location: Carrollton, Texas
Posted: 26 Jun 2011 04:27:31 pm    Post subject:
Alright well thanks for the help. It would be nice if PHP had something like that in the future.

I think that I am going to go with your function.
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KermMartian


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Joined: 14 Mar 2005
Posts: 55759
Location: Earth, Sol, Milky Way
Posted: 26 Jun 2011 06:34:40 pm    Post subject:
kpa4941 wrote:
Alright well thanks for the help. It would be nice if PHP had something like that in the future.

I think that I am going to go with your function.
Excellent, I hope that it serves you well. You should suggest this to the PHP developers!
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