Replace characters in MySQL query result PHP - php

Question

Couldn't find an exact answer to this question on here, though it may be simple (if there is an answer please point me in the right direction).
I am pulling some data from MySQL and some of the characters are causing the data not to be displayed at the end point. I therefore need to single out these specific characters and replace them with a permitted character. Specifically I need to change & , ' and + . I have to do this working from this query:
$query = "select * from data where a_data_id=".$ID." AND a_discard_data_from!=1";
I was wondering if I can add to this string, or after this string, some rule to replace instances & , ' or + with another character/s.
Thanks for looking!
NOTE: There is no problem with the string above, it is functioning fine, I just want to add to it or after it some type of code that will replace certain characters in the data pulled from the query
Surrounding Code:
$arr="";
$main_arr="";
$query = "select * from data where a_data_id=".$ID." AND a_discard_data_from!=1";
$query .=" and last_update >= " . '"' . $dataDate . '"';
$table = mysql_query($query);
if (mysql_num_rows($table) > 0) {
while ($row = mysql_fetch_assoc($table)) {
foreach ($row as $key => $value) {
$arr[$key] = $value;
if ($key == "to_data_id") {
$array=mysql_fetch_array(mysql_query("select name,additional from details where data_id=".$value));
$arr["data_id"] = $array['additional'].".".$array['name'];
}
}
$main_arr[] = $arr;
}
}
$data = json_encode($main_arr);
Just how to slow it into this code would be great, thank you! (This code works fine, just want to know what I could change / add to replace those characters).
UPDATE: Is anyone able to give me an answer with how I might be able to use strtr()function to replace the results please? Thanks again for the responses!

Answer 1

In mysql if you manually select a field after selecting * it overwrites that field, so provided there's only one field you want to run replaces on and you know the field you know which field it is in advance you can change your select query to (the somewhat ungraceful):
"select
*,
REPLACE(
REPLACE(
REPLACE(`data`.`YOURFIELDNAME`, '&', 'A'),
',', 'A'),
'\'', 'A')
from
data
where a_data_id=".$ID." AND a_discard_data_from!=1";
Which will remove those characters. This is not very graceful, and as eggyal pointed out, you're better off doing this on the front end.