PHP advanced filter

Detect whether a number is within a range

The following example uses the filter_var() function to detect whether an INT type variable is within 1 to 200 :

Example

 array("min_range"=>$min, "max_range"=>$max))) === false) { echo("变量值不在合法范围内"); } else { echo("变量值在合法范围内"); } ?>

##Detect IPv6 address

The following example uses the filter_var() function to detect whether a $ip variable is an IPv6 address:

Example

Detect URL - must contain QUERY_STRING (query string)

The following example uses the filter_var() function to detect whether $url contains the query string:

Example

Remove characters with ASCII values greater than 127

The following example uses filter_var () function to remove characters with an ASCII value greater than 127 in a string. It can also remove HTML tags:

Example

Hello WorldÆØÅ!"; $newstr = filter_var($str, FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_HIGH); echo $newstr; ?>