How to get the first occurrence?

posted by iup85 on 2009-07-06 10:25:22

Hey!
I have a string like that:

 
$s="123-this-is-a-test";

How can I only get 123 ?
Then, I have to check if it's a numeric.
(is not 3 chars long always)

dail
12

 
$s="123-this-is-a-test";
$id = strstr($s, '-', true);
if (is_numeric($id))
    echo "It is a number";
else
    echo "It is not a number";

The third parameter of strstr() has been added to the 5.3.0 PHP version.
If you are using an older php version you should do:

 
$s="123-this-is-a-test";
$id = explode('-', $s, 1);
if (is_numeric($id[0]))
    echo "It is a number";
else
    echo "It is not a number";

Bye

49 answers - 0 questions

gregoriohc
1

Other shorter way:

$s="123-this-is-a-test";
if (is_numeric(array_shift(explode('-', $s))))
    echo "It is a number";
else
    echo "It is not a number";
?>

1 answers - 0 questions

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