How to empty variable if it doesn't begin with http?

[Jeffro]

How would I write this in php?:

 

If $url does not begin with 'http://'
$url = ''

 

I want to assign nothing to the variable if it doesn't begin with http://

 

Thanks! 

[kenrbnsn]

I would use substr

 

<?php
if (substr($url,0,7) != 'http://') {
  $url = '';
}
?>

 

Ken

[Fadion]

Personally I would use strpos()

 

<?php
if (strpos($url, 'http://') === FALSE) {
     $url = '';
}
?>

[Jeffro]

I would use substr

 

<?php
if (substr($url,0,7) != 'http://') {
  $url = '';
}
?>

 

Ken

 

Worked like a charm.  Thank you!