Php foreach array (then split index)

Question

I have into $_POST array all the data i need.

If I print_r the array, I see something like this:

Array (
  [0_45_115] => 01
  [0_46_115] => 01
  [0_47_115] => 01
  [0_48_115] => 01
  [0_49_115] => 01
  [0_50_115] => 01
  [0_51_115] => 01
  [0_52_115] => 01
  [0_53_115] => 01
  [0_54_115] => 01
  [0_55_115] => 01
  [0_56_115] => 01
  [0_57_115] => 01
  [0_58_115] => 01
  [0_59_115] => 01
  [0_60_115] => 01
  [0_61_115] => 01
  [0_62_115] => 01
  [0_63_115] => 01
  [0_64_115] => 01
  [0_65_115] => 01
  [0_66_115] => 01
  [0_67_115] => 01
)

The index i post from the form (the name attr) doesn't have underscores. For example:

<input type="text" name="0 45 115" value="" />

Let's forget this.

0_45_115 which the index is will provide me all the neccessery data I want to update or insert a new row into my database. The value will saw me the information I want.

The problem is that I don't know how to manage the array. Maybe I must use foreach method, and the I will use split function to split the index of each row. Then I will do all the other stuff for insertion/update my database.

I ask how can I use foreach to take the info (index-data) from $_POST array.

Aleks G · Accepted Answer · 2011-12-27 21:44:09Z

1

The spaces are converted to underscores per PHP specifications. See this page for more details. Specifically, search for this string in the page: Dots and spaces in variable names are converted to underscores.

I think the right approach would be

foreach($_POST as $key => $value)
{
    $parts = explode('_', $key);    //split your $key
    //then deal with corresponding $value
}

edited Dec 27, 2011 at 21:44

answered Dec 27, 2011 at 21:39

Aleks G

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Comments

abuduba · Accepted Answer · 2011-12-27 21:37:14Z

1

foreach( $yourArray as $k => $v ) { 

   $keys = explode( "_", $k) // for first iterate you will get array('0','45','115')

}

answered Dec 27, 2011 at 21:37

abuduba

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1 Comment

Chris P Over a year ago

your solution is better.. I must learn object oriented php and PDO, but no free time unfortunatelly..:( Thx for the answer

Community · Accepted Answer · 2023-11-17 19:59:20Z

1

See the array_keys() function.
It will return all the keys of the input array, than you can use the split() function to work on the keys and get the data you need.

For example:

$keys = array_keys($yourArray);
foreach($keys as $k) {
    $data = split("_", $k);
    print $data[0];
    print $data[1];
    print $data[2];

}

edited Nov 17, 2023 at 19:59

CommunityBot

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answered Dec 27, 2011 at 21:36

Davide Gualano

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2 Comments

Chris P Over a year ago

it seems that's what i am looking for.. Do you have any explanation of underscores mr gualano?

Davide Gualano Over a year ago

I've edited my answer with a little example of the split() function.

outis · Accepted Answer · 2011-12-27 21:47:02Z

0

As an alternative to a loop, you can use array_map:

array_map(function ($str) {return explode('_', $str);}, 
          array_keys($_POST));

Result:

array (
  array (
    0 => '0',
    1 => '45',
    2 => '115',
  ),
  array (
    0 => '0',
    1 => '46',
    2 => '115',
  ),
  array (
    0 => '0',
    1 => '47',
    2 => '115',
  ),
  ...

Since only PHP 5.3 and newer have anonymous functions at the language level, a loop is the better choice if you need to support earlier PHP versions. Otherwise, you have to use create_function, which is just ugly.

answered Dec 27, 2011 at 21:47

outis

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