Question

I am trying to test if a url leads to an image, such as “http://i.imgur.com/vLsht.jpg”
by testing to see if the string contains “.jpg” or “.png” or “.gif” etc.

My curent code is:

if (stripos($row_rsjustpost['link'], ".png") !== false) {
//do stuff
}

I would like to do something like

if (stripos($row_rsjustpost['link'], ".png" || ".jpg" || ".gif") !== false) {
//do stuff
}

Answer 1

This is an okay use of a regular expression via preg_match():

$matches = array();
if (preg_match('/\.(png|jpg|gif)/i', $row_rsjustpost['link'], $matches) {
    // Contains one or more of them...   
}

// $matches holds the matched extension if one was found.
print_r($matches);

Note: if the string must occur at the end like a file extension, terminate it with $:

/\.(png|jpg|gif)$/i
//-------------^^

If you were attempting to locate only one substring, it would be more appropriate to use stripos(), but you can match a number of different patterns with a regex, without having to cough out a long if/else chain.