- is_numeric: documentation ( source)
- explode: documentation ( source)
- trim: documentation ( source)
<?php
$input = ['1, 2, 3, 4, 5', 'test', 3, '100, a, test'];
foreach ($input as $item) {
if (is_string($item)) {
foreach (explode(',', $item) as $i) {
if (is_numeric($i)) {
echo trim($i) . PHP_EOL;
}
}
}
}