PHP str_replace is not replacing value - php

Question

I've been bashing my head against the wall for a couple of days on this, because all indications are that this SHOULD work, so I'm obviously missing something simple.
First I am using a function to grab an array of user submitted comments
function get_id_comment_info($id) {
global $connection;
$pdo = new PDO('mysql:host='.DB_SERVER.'; dbname='.DB_NAME, DB_USER, DB_PASS);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$pdo->exec('SET NAMES "utf8"');
$sql = "SELECT parks.parkid, parks.state, pcomment.parkid, pcomment.comment, pcomment.logname
FROM parks
LEFT JOIN pcomment
ON parks.parkid=pcomment.parkid
WHERE parks.id = '$id'";
$result = $pdo->query($sql);
$cominfo = $result->fetchAll();
return $cominfo;
}
Then, inside of a foreach loop which processes each park by id, I am working with the data:
foreach ($display_result as $parkrow) {
$id = $parkrow['parkid'];
$comments = get_id_comment_info($id);
$cleancom = str_replace("'", '', $comments);
print_r($cleancom);
.
.
.
}
The output for $cleancom is:
Array ( [0] => Array ( [parkid] => 462 [0] => 462 [state] => KS [1] =>
KS [2] => 462 [comment] => I have noticed some others here say don't
waste your time, but I think it's ok. Yes, it's smaller than most, but
there is fun to be had if you are an avid rider. [3] => I have noticed
some others here say don't waste your time, but I think it's ok. Yes,
it's smaller than most, but there is fun to be had if you are an avid
rider. [logname] => John32070 [4] => John32070 ) )
It does not remove the '. If I use preg_replace then the output is simply blank. I am missing something simple, but I just can't see it!

Answer 1

I have tested the str_replace() function and got the following results:
$myArray = array("h'i", array("hi'hi", "yo"));
print_r($myArray);
//RESULT: Array ( [0] => h'i [1] => Array ( [0] => hi'hi [1] => yo ) )
After applying the filter:
$filtered = str_replace( "'", "", $myArray);
print_r($filtered );
//RESULT: Array ( [0] => hi [1] => Array ( [0] => hi'hi [1] => yo ) )
What the previous results show is that any string values inside the top array are indeed being converted (h'i converted to hi) while any values that form part of the multidimensional array (any arrays within arrays) are not hi'hi remained the same. This seems to be how the function was created to work.
One solution is:
$cleancom = [];
foreach ($comments as $key => $value)
{
$cleancom[$key] = str_replace( "'", "", $value );
}
The reason the previous code works is because str_replace() is never being applied to a multidimensional array, while in your previous code it was. The previous code will not work however if you have something like an array within an array within another array, so if that ends up being the case in the future, I suggest you try finding a solution with callback functions.
Let me know if this worked for you.

Answer 2

Want to say something else, you should put the ids in an array, then use MySQL in() function, it only need to execute once, while your method will execute many times.