[Resolved] Searching a string

[bengt]

Hello

I have a string:

$string = "1,2,3,4,5,6,7";

How can I check to see if this string contains the number 4?

Probably a silly question, but I have searched, but does not quite find it.

Bengt

[Installer]

strpos()

[laserlight]

You might want to use [man]explode/man on the string instead, unless having 40 in the string should be treated as having 4 in the string.

[laserlight]

Suppose
$string = "1,2,3,40,5,6,7";

Does the above string contain the number 4?
If the string is viewed as a string of characters, and we're looking for the character '4', then yes, $string contains the number 4.
If the string is viewed as a comma separated list of integers, then no, $string does not contain the number 4.

[Installer]

$string = "1,2,3,4,5,6,7";
if (($pos = strpos($string, '4,')) !== false) {
    echo '4 is at postition ' . $pos . '.<br />';
} else {
    echo '4 is not found.' . '<br />';
}

🙂

[laserlight]

That's a hack, and you know it.

[bengt]

Thanx alot for your answers. I have used Installer's script. And the hack is not neccesery... yet...😉
the highest number for now is 8.

[Installer]

l.l.:
Yes, I know. That's why I added the smilie. It's no substitute for your better solution.

There's always this:

$num = '4';
$four_found = false;
for ($pos = 0; $pos < strlen($string); $pos++) {
    if (substr($string, $pos, strlen($num)) == $num) {
        echo $num . ' is at position ' . $pos . '.<br />';
        $four_found = true;
        break;
    }
}
if (!$four_found) {
    echo $num . ' is not found.' . '<br />';
}

:-|

[laserlight]

But actually your original solution is best, since bengt has rather limited requirements...

There's always this:

Now that's madness :p