PHP - use regex to change Array Key based on Values

Question

I have just started to learn Regular Expressions and I think this can be done using regex, but not able to find a proper regex match. Here is the situation: I want to fill the Key in the array with the respective values, but make everything lowercase and underscore for space.

Example PHP array:

array('' => 'Red Apple',
      '' => 'Blue Sky',
      '' => 'Circle/Earth');

Output should be:

array('red_apple' => 'Red Apple',
      'blue_sky' => 'Blue Sky',
      'circle_earth' => 'Circle/Earth');

I was able to use strtolower() but getting stuck with using preg_replace(). Can I even do this with regex?

Thanks.

u can do this without using regex, consult string function in php manual — slier
– slier, Commented Jan 23, 2013 at 19:59

Alexandru Calin · Accepted Answer · 2013-01-23 20:08:29Z

1

As slier said, it can be done without preg_replace

Here is a snippet

$new_key = strtolower(str_replace(array(' ', '/'), '_', $value)));

Check http://php.net/str_replace Quick introduction

str_replace(find, replace, value);

find can be an array containing common unwanted chars, such as array('-', '/', ' ', .. etc);

edited Jan 23, 2013 at 20:08

answered Jan 23, 2013 at 20:01

Alexandru Calin

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Community · Accepted Answer · 2023-11-17 19:24:28Z

0

You can use preg_replace() and strtolower() to achieve this:

$key = strtolower(preg_replace(array('/[^a-z]+/i', '/\s/'), "_", $string));

edited Nov 17, 2023 at 19:24

CommunityBot

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answered Jan 23, 2013 at 20:08

Tchoupi

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Comments

John Conde · Accepted Answer · 2013-01-23 20:31:03Z

0

Confirmed working:

$array = array(
    'Red Apple',
    'Blue Sky',
    'Circle/Earth'
);

function nice_keys($key) {
    return strtolower(str_replace(array(' ', '/'), '_', $key));
}

$clean_keys = array_map('nice_keys', $array);
$new_array = array_combine($clean_keys, $array);

print_r($new_array);

Reference:

edited Jan 23, 2013 at 20:31

answered Jan 23, 2013 at 20:06

John Conde

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