how to split a string and build an associative array php? - php

Question

How to split a string in PHP ? For example, if i have the string like
Array([0] => "1=>10,2=>9,3=>7,1=>9,2=>8,3=>7");
how can i get
Array([0] => 1=>10,2=>9,3=>7 [1] => 1=>9,2=>8,3=>7);
and later i want to build an associative array like for example,
$ratings = array(6533 => ['Build Quality' => [1=>10,2=>9,3=>7],
'Versatility' => [1=>9,2=>8,3=>7],
'value' => [1=>9.5,2=>7,3=>6]]);
//takes the current post id and returns an product ratings array
function get_ratings($current_post_id){
$product_post = get_post($current_post_id);
preg_match_all("/\[v360_product_table\s.*?\]/", $product_post>post_content, $product_elements);
$product_elements = $product_elements[0][0];
preg_match_all('/"([^"]+)"/', $product_elements, $parameters);
$product_params = $parameters[0][0];
$rating_params = preg_split('","', $product_params);
$rating_factors = str_replace('"', '', $rating_params);
$b = print_r($rating_factors);
/* output: Array ( [0] => Build Quality [1] => Versatality [2] => Adoptability) */
$product_rank = $parameters[0][1];
/* output: Array ( [0] => 1=>10,2=>9,3=>7,1=>9,2=>8,3=>7 ) */
$rank_split = preg_split('"**have to split it here**"', $product_rank);
$rank_values = str_replace('"', '', $rank_split);
$assoc_array = array_combine($rating_factors, $rank_values);
/* needs to construct an array like '$ratings' */
$ratings = array(6533 => ['Build Quality' => [1 => 10, 2 => 8, 3 => 7],
'Versatility' => [1 => 9, 2 => 9, 3 => 8], 'Value' => [1 => 10, 2 => 8,3 => 8]]);
return $ratings[$current_post_id];
}

Answer 1

From your examples, I'm guessing you want to split the string by commas followed by the number 1. To do this, you can use preg_split() with a positive lookahead:
$string = "1=>10,2=>9,3=>7,1=>9,2=>8,3=>7";
$split = preg_split('/,(?=1\b)/', $string);
var_dump($split);
Gives:
array(2) {
[0]=>
string(15) "1=>10,2=>9,3=>7"
[1]=>
string(14) "1=>9,2=>8,3=>7"
}
This function will parse out the whole string into a nested array:
function split_string($string)
{
$split = array();
foreach (preg_split('/,(?=1\b)/', $string) as $row => $part1) {
foreach (explode(',', $part1) as $part2) {
list($key, $value) = explode('=>', $part2, 2);
$split[$row][$key] = $value;
}
}
return $split;
}
Tested as follows (in php 5.6):
$string = "1=>10,2=>9,3=>7,1=>9,2=>8,3=>7";
$split = split_string($string);
var_dump($split);
Gives this output:
array(2) {
[0]=>
array(3) {
[1]=>
string(2) "10"
[2]=>
string(1) "9"
[3]=>
string(1) "7"
}
[1]=>
array(3) {
[1]=>
string(1) "9"
[2]=>
string(1) "8"
[3]=>
string(1) "7"
}
}
You could then use array_combine() for example to merge in the names:
$string = "1=>10,2=>9,3=>7,1=>9,2=>8,3=>7";
$split = split_string($string);
var_dump(array_combine(array('Build Quality', 'Versatility'), $split));