Query with a PHP foreach using OR and LIKE %? - php

Question

I have sort of a tricky problem, and I want to see if there is an easier way about solving it.
I have let's say
$numbers= $_GET['numbers']; //resulting in $numbers=array(1,2,3)
The count in the array may vary depending on the $_GET value...
These need to search using '%" . $number. "%' because there might be more than one number in the row separated by commas
My ideal result would perform a search for the $numbers(1,2,3) with:
SELECT * FROM database WHERE numbers LIKE('%1%' OR '%2%' OR '%2%')

Answer 1

No need to inject many OR operators for each element of the Array. Instead you can use rlike (the regex matcher operator of MySQL) and simplify your code to a great extent like this:
$numbers = array(1,2,3);
$sql = 'SELECT * from `database` WHERE number rlike "^'.implode('|', $numbers).'$"';
// $sql becomes: SELECT * from `database` WHERE number rlike "^1|2|3$"

Answer 2

$like_part = implode(' OR ', array_map(function($i) {
return "(_utf8 '%{$i}%' USING latin1)";
}, $numbers)
);

Answer 3

Use the foreach to build the where string, then add it to the query.
$query = '...';
$where = '';
foreach ($numbers as $number) {
$where .= ...
}
$query .= $where;
I won't mention that you should normalize your tables and use prepared queries.

Answer 4

This code:
<?php
$numbers = array(1,2,3);
$sql = "SELECT * FROM table WHERE numbers LIKE ('%" . implode("%' OR '%", $numbers) . "%')";
Resulting this query:
SELECT * FROM table WHERE numbers LIKE ('%1%' OR '%2%' OR '%3%')

Answer 5

to the effect of:
$query = "select * from table where condition like ('text before '".implode("' text after text before'", $array)." ' text after')"
$query = "select * from table where numbers like (\"_utf8 '%" . implode("%' using latin1\", $_GET['numbers']) . "%' using latin1 OR _utf8 '%\")
[not sure if implode is needle/haystack or vice versa]

Answer 6

1 - SELECT * FROM b AS B INNER JOIN a AS A ON A.a=B.a WHERE A.a RLIKE '^1-|^2-|^3'
2 - SELECT * FROM b AS B INNER JOIN a AS A ON A.a=B.a WHERE (A.a LIKE '1-%' OR A.a LIKE '2-%' OR A.a LIKE '3-%')
First query took around
Memory usage = It is taking time
Execution time = It is taking time
PHPMYADMIN Showing rows 0 - 24 (138 total, Query took 1.1243 seconds.) - Tested with very less data than through direct PHP script
Second query took around
Memory usage = 1198.0807113647 MB
Execution time = 30.719851970673 Seconds
PHPMYADMIN - Showing rows 0 - 24 (138 total, Query took 0.0018 seconds.) - Tested with very less data than through direct PHP script
Foreach took around
Memory usage = 972.3137588501 MB
Execution time = 10.898797988892 Seconds
Configuration
32GB RAM
Intel I9 - 10th gen CPU#2.81GHz
PHP 7.3
MYSQL - 5.7.31
Table size - 2M million data generated by SQL procedure
SHOW VARIABLES LIKE 'have_query_cache'; // YES
Fetched data size 275093
Indexing - Available
Count of variable in LIKE operator 4739 (i.e. 1,2,3... in RLIKE '^1-|^2-|^3....etc')
Memory uage calculated by php function memory_get_usage();
Objections welcomes.