Get numbers from string with PHP

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You can use regular expressions for this. The \d escape sequence will match all digits in the subject string.

For example:

<?php

function get_numerics ($str) {
    preg_match_all('/\d+/', $str, $matches);
    return $matches[0];
}

$one="foo bar 4 baz (5 qux quux)";
$two = 'bar baz 2 bar';
$three="qux bar 12 quux (3 foo)";
$four="foo baz 3 bar (13 quux foo)";

print_r(get_numerics($one));
print_r(get_numerics($two));
print_r(get_numerics($three));
print_r(get_numerics($four));

https://3v4l.org/DiDBL

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