PHP function to separate integer and string part from a given string variable

Question

I have a string variable $nutritionalInfo, this can have values like 100gm, 10mg, 400cal, 2.6Kcal, 10percent etc... I want to parse this string and separate the value and unit part into two variables $value and $unit. Is there any php function available for this? Or how can I do this in php?

Use regex: preg_match_all('/(?P<digit>\d+(?:\.\d+))(?P<unit>\w+)/', $string, $matches);print_r($matches); — HamZa
– HamZa, Commented Apr 23, 2013 at 8:00

chandresh_cool · Accepted Answer · 2013-04-23 08:09:02Z

8

Use preg_match_all, like this

$str = "100gm";
preg_match_all('/^(\d+)(\w+)$/', $str, $matches);

var_dump($matches);

$int = $matches[1][0];
$letters = $matches[2][0];

For float value try this

$str = "100.2gm";
preg_match_all('/^(\d+|\d*\.\d+)(\w+)$/', $str, $matches);

var_dump($matches);

$int = $matches[1][0];
$letters = $matches[2][0];

edited Apr 23, 2013 at 8:09

answered Apr 23, 2013 at 8:03

chandresh_cool

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2 Comments

chandresh_cool Over a year ago

Thanks @HamZaDzCyberDeV well it was a good workaround though.

mrcendre Over a year ago

Won't match units such as mico grams, for example 5µg

Rikesh · Accepted Answer · 2013-04-23 08:17:43Z

4

Use regexp.

$str = "12Kg";
preg_match_all('/^(\d+|\d*\.\d+)(\w+)$/', $str, $matches);
echo "Value is - ".$value = $matches[1][0];
echo "\nUnit is - ".$month = $matches[2][0];

Demo

edited Apr 23, 2013 at 8:17

answered Apr 23, 2013 at 8:03

Rikesh

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Comments

Tyler Kemme · Accepted Answer · 2017-10-01 19:49:20Z

2

I had a similar problem but none of the answers here worked for me. The problem with the other answers is they all assume you'll always have a unit. But sometimes I would have plain numbers like "100" instead of "100kg" and the other solutions would cause the value to be "10" and the units to be "0".

Here's a better solution I somewhat took from this answer. This will separate the number from ANY non-number characters.

$str = '70%';

$values = preg_split('/(?<=[0-9])(?=[^0-9]+)/i', $str);

echo 'Value: ' . $values[0]; // Value: 70
echo '<br/>';
echo 'Units: ' . $values[1]; // Units: %

answered Oct 1, 2017 at 19:49

Tyler Kemme

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