Partially Equal?

josh_a64

Ok, I want to make an IF statement, where IF the variable has certain letters in it to do something.

My guess (don't work):

$v = "ARRS"; // A user enters this value.

if($v =~ "RS") {
// If the variable contains RS
echo "Something";
}

else {
// If the variable does not contain RS
echo "Something else";
}

bubblenut

$v = "ARRS"; // A user enters this value.

if(strpos($v, 'RS')!===false) {
// If the variable contains RS
echo "Something";
}

else {
// If the variable does not contain RS
echo "Something else";
}

HTH
Bubble

khjart

Just use strpos()

$v = 'ARRS';
$string  = 'RS';
$pos = strpos($v, $string);

if($pos) {
// If the variable contains RS
echo "Something";
}

else {
// If the variable does not contain RS
echo "Something else";
}

josh_a64

Thanks for the help!

Using:

$v = "ARRS"; // A user enters this value.

if(strpos($v, 'RS')) {
// If the variable contains RS
echo "Something";
}

else {
// If the variable does not contain RS
echo "Something else";
}

bubblenut

Note that failing to explicitly test for boolean false (===false) will fail if the search string occurs at the start as strpos will return a value of zero.

khjart

True, you would have to go by bubblenut's example. You need to remove a '=', though.

if(strpos($v, 'RS') !== false)

Tekime

=== tests for type and value; it must be a boolean true to evaluate as true, whereas == would evaluate to true if the subject has any non-zero length value.

*edit: Link - check out the 2003-05 post by discord at spambegone dot mac dot com

khjart

Yes, but using "!==" does the same here.

Tekime

Good point. !=== isn't even valid syntax is it. 🙂

!== is not identical
=== is identical

http://us3.php.net/manual/en/language.operators.comparison.php