explode() / implode()
function
explode() splits a string into an array by separator; implode() (alias: join) joins an array into a string.
Syntax
explode(string $separator, string $string): array
Example
php
<?php
$csv = 'Alice,Bob,Charlie';
$names = explode(',', $csv);
print_r($names); // ['Alice','Bob','Charlie']
$tags = ['php', 'laravel', 'mysql'];
echo implode(', ', $tags); // php, laravel, mysql