PHP - split a string into an array of numerical keys

Question

I want to split a string in PHP into a 'name' part (string) and a 'keys' part (array of integers).

Example input:

 $input = "Sum(1, 5, 7)";

Desired output:

 $name = "Sum";
 $keys = [1, 5, 7];

I've been looking at explode, str_split preg_split, and I'm sure there are many possible implementations. What's the most elegant solution?

Euh, what about Sum(1, Sum(1, 5, 7), 7) ? What's the expected output ? — HamZa
– HamZa, Commented Feb 21, 2014 at 13:30
Is it always in the format "word" "bracket" "comma delimited numbers" "bracket"? — Grim...
– Grim..., Commented Feb 21, 2014 at 13:31
@Grim, Great questions. Yes I would expect it always to be "word" "bracket" "comma delimited numbers" "bracket". HamZa's example would be an invalid (illegal) input. The string is in a config file so I have control regarding unexpected inputs. — mtmacdonald
– mtmacdonald, Commented Feb 21, 2014 at 13:34
@MMacdonald Is the input Sum(1, 5, 7) or could there be several "parts" like Sum(1, 5, 7) , Div(10, 5), Mul(3, 4) ? — HamZa
– HamZa, Commented Feb 21, 2014 at 13:57
@HamZa - exclusively Sum(1, 5, 7) ... word, bracket, comma delimited numbers, bracket. No other variations. — mtmacdonald
– mtmacdonald, Commented Feb 21, 2014 at 14:34

Opalosolo · Accepted Answer · 2014-02-21 13:32:53Z

6

$input = "Sum(1, 5, 7)";

preg_match_all('#(\w+)\((.*?)\)#', $input, $m);

print_r($m);

Example Ideone.com

answered Feb 21, 2014 at 13:32

Opalosolo

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2 Comments

mtmacdonald Over a year ago

seems like a good start but this actually returns '1, 5, 7' as string, not as an array.

Jon Over a year ago

from there, just explode the string in to an array.

HamZa · Accepted Answer · 2014-02-21 13:50:35Z

1

Try this out:

$input = "Sum(1, 5, 7)";

$split1=explode('(',$input);

$name=$split1[0];
echo $name;
$newk=rtrim($split1[1],')');
echo '<br>';
$keys=explode(',',$newk);
print_r($keys)

Online demo

edited Feb 21, 2014 at 13:50

HamZa

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answered Feb 21, 2014 at 13:36

Karthick Kumar

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1 Comment

Jon Over a year ago

Please put the code in the answer as well so the answer isn't purely a link.

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