unset range of keys in an array

Question

How can i unset a range of keys between say 70 to 80 in an array like this?

[63] => Computer Science and Informatics
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[67] => Earth Systems and Environmental Sciences
[68] => Economics and Econometrics
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[70] => Electrical and Electronic Engineering
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[72] => Epidemiology and Public Health
[73] => European Studies
[74] => French
[75] => General Engineering and Mineral & Mining Engineering
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[77] => Geography and Environmental Studies
[78] => German, Dutch and Scandinavian Languages
[79] => Health Services Research
[80] => History
[81] => History of Art, Architecture and Design
[82] => Iberian and Latin American Languages
[83] => Infection and Immunology
[84] => Italian
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[88] => Mechanical, Aeronautical and Manufacturing Engineering
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its to remove 67 keys, so dont want to unset each individually — smith
– smith, Commented Feb 28, 2010 at 22:25

jtm · Accepted Answer · 2010-02-28 22:36:05Z

12

You can try array_slice

$return = array_slice($original, 0, 60)

then

$return = $return+array_slice($original, 70)

or

array_splice

$return = array_splice($original, 60, 10)

edited Feb 28, 2010 at 22:36

answered Feb 28, 2010 at 22:31

jtm

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2 Comments

ryeguy Over a year ago

This works, but it's really inefficient. You're creating 3 arrays in addition to the one you start with.

karim79 Over a year ago

Given the fact that it is a fairly small data set, I would probably go with this solution, I don't think its efficiency is going to have any perceptible impact on performance, plus it is readable and somewhat elegant. Voted up.

ryeguy · Accepted Answer · 2010-03-01 00:42:45Z

11

There isn't really a shortcut to this:

for ($i = 70; $i <= 80; $i++)  
    unset($array[$i]);

edited Mar 1, 2010 at 0:42

answered Feb 28, 2010 at 22:32

ryeguy

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3 Comments

Alex Weber Over a year ago

+1 for this one too, its a simpler solution and gets the job done the same

TravisO Over a year ago

It's kind of dissapointing, all the PHP coders who always ask if there's a function to do something bizarrely niche, when a for()/foreach() loop does it just fine.

John Yetter Over a year ago

Can you step forward through the array during the unset? Doesn't that cause an issue with changing the index of the next element to be unset as you move through? I would have thought you had to step through from 80 to 70, decrementing i.

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