PHP: Make the loop and variable variables into a function

Question

How can I make the code below into a function?

# split the string by string on boundaries formed by the string delimiter will split the value into an array like the example below,
# Array
# (
#     [0] => pg_cat_id=1
#     [1] => tmp_id=4
#     [2] => parent_id=2
# )
$array_parent = explode("&", $string);
//print_r($array_parent);

# now loop the array.
for($i = 0; $i < count($array_parent); $i++)
{   
    # split the array into smaller arrays with the string delimiter, like the example below,
    #   Array
    #   (
    #       [0] => pg_cat_id
    #       [1] => 1
    #   )
    #   Array
    #   (
    #       [0] => tmp_id
    #       [1] => 4
    #   )
    #   Array
    #   (
    #       [0] => parent_id
    #       [1] => 2
    #   )
    $array_child = explode("=", $array_parent[$i]);
    //print_r($array_child);

    # loop each of the array.
    for($a = 0; $a < count($array_child); $a++)
    {   
        # get the first value in each array and store it in a variable.
        $v = $array_child[0];

        # make the variable variable (sometimes it is convenient to be able to have variable variable names. 
        # that is, a variable name which can be set and used dynamically. a variable variable takes the value 
        # of a variable and treats that as the name of a variable). 
        ${$v} = $array_child[1];
    }
}

so that I can call the function whenever I need it, such as below,

$string = 'pg_cat_id=1&tmp_id=4&parent_id=2';

echo stringToVarVars($string);

echo $tmp_id; // I will get 4 as the restult.

Many thanks, Lau

Don't do that. Don't try to re-implement register_globals... — ircmaxell
– ircmaxell, Commented Aug 20, 2010 at 13:20

Darragh Enright · Accepted Answer · 2010-08-20 13:20:47Z

3

Are you parsing a query string? You could use parse_str().

answered Aug 20, 2010 at 13:20

Darragh Enright

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Comments

shamittomar · Accepted Answer · 2010-08-20 13:23:27Z

2

Full working code here. No need to create a function. Just two line of codes are enough.

<?php
$string = 'pg_cat_id=1&tmp_id=4&parent_id=2';

parse_str($string, $result);
extract($result);

echo $tmp_id;  // output: 4
?>

answered Aug 20, 2010 at 13:23

shamittomar

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1 Comment

Run Over a year ago

oh thank you so much. this save lots of my tedious code! thanks :)

Sjoerd · Accepted Answer · 2010-08-20 13:20:46Z

1

Use the global keyword to set variables outside of the function.

function stringToVarVars($string)
{
    ...
    global ${$v};
    ${$v} = ...;
}

answered Aug 20, 2010 at 13:20

Sjoerd

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Comments

Sjoerd · Accepted Answer · 2010-08-20 13:22:58Z

0

Use an array instead of variable variables:

function stringToVarVars($string)
{
    ...
    $result[$v] = ...;
    return $result;
}

$variables = stringToVarVars($string);
echo $variables['tmp_id'];

answered Aug 20, 2010 at 13:22

Sjoerd

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1 Comment

mickmackusa Over a year ago

I'm not sure why you didn't combine your two very similar answers into one. Hoping to double dip on upvotes? Perhaps just delete this one and merge the answers into the upvoted one.

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