Check if array key matches data from select query - php

Question

I have a multidimensional array. They keys of the separate arrays are text. I would like to know how to match the key with part of a string that's from looped SELECT data.
Example of Array
Array ( [Volvo] => Array ( [0] => )
[Ford] => Array ( [0] => )
[Seat] => Array ( [0] => ) )
So from this array $cars, how would I be able to match data coming from my SELECT query
Select Output echo $row['car'];
Volvo, Mercedes, Lexus
What I'm after
if the key of one of my arrays matches part of the string from my select query, so as the example says above Volvo would match, then do something. That something for me is adding more data in that array.
I have tried variations of in_array, array_search and array_filter but have not found a solution that works for me.
Example of the reverse of what i was doing through a foreach loop
$searchword = $array_element;
$result = array_filter($cars, function($var) use ($searchword) { return preg_match("/\b$searchword\b/i", $var); });
taken from: Search for PHP array element containing string

Answer 1

This should work for you:
First I used preg_split() to split your search string (Volvo, Mercedes, Lexus) into an array.
The regex:
/\s*,\s*/
Simply means this:
\s* match any white space character [\r\n\t\f ]
Quantifier: * Between zero and unlimited times, as many times as possible, giving back as needed [greedy]
, matches the character , literally
\s* match any white space character [\r\n\t\f ]
Quantifier: * Between zero and unlimited times, as many times as possible, giving back as needed [greedy]
This makes sure we don't have spaces in the search words from your string. So with this we will end up with an array like this:
Array
(
[0] => Volvo
[1] => Mercedes
[2] => Lexus
)
After that I just take the array_intersect_key() from your array and the search array, which we just created.
Code:
<?php
$arr = preg_split("/\s*,\s*/", $row["car"], -1, PREG_SPLIT_NO_EMPTY);
if(($intersect = array_intersect_key($cars, array_flip($arr)))) {
echo "Do stuff!";
print_r($intersect);
} else {
echo "Drink a cup of tea";
}
?>
output:
Array
(
[Volvo] => Array
(
[0] =>
)
)

Answer 2

There are many ways to achieve your goal. I would use function explode() to split the data retrieved from the database ($row['car']) into pieces and trim() to be sure the identified pieces do not have padding spaces:
$brands = array_map('trim', explode(',', $row['car']));
Now, print_r($brands) should reveal an array whose values are candidate keys in your example array (called $example below).
Next it depends on what you want to match and how you want to process the matches.
A simple identification can be done using array_intersect() with $brands and the keys of the example array (see function array_keys()).
$common = array_intersect($brands, array_keys($example));
foreach ($common as $key) {
// Do something with $example[$key]
}
Or you can iterate directly over $brands and check if the value is a key in $example:
foreach ($brands as $key) {
if (array_key_exists($key, $example)) {
// Do something with $example[$key]
}
}
You can use isset($example[$key]) as well, instead of array_key_exists($key, $example]).

Answer 3

Try using PHP stripos, it's simple and effective:
Base data:
$array = Array ( [Volvo] => Array ( [0] => )
[Ford] => Array ( [0] => )
[Seat] => Array ( [0] => ) )
;
SQL data (string or array):
$row['car']; // string
$row //array of all SQL columns output
Foreach with stripos:
foreach($array as $rowKey=>$rowArray){
$rowKey = trim($rowKey);
foreach($row as $sqlRow=>$sqlArray){
$sqlRow = trim($sqlRow);
if (stripos($rowKey,$sqlRow) !== false){
///values are the same in this key in the array and in the SQL output
}
}
unset($sqlRow,$sqlArray);
}
unset($rowKey,$rowArray);
This may not be the most efficient but should give you the result you want