PHP
Filters Advanced
Validate an
Integer Within a Range
The
following example uses the filter_var() function to check if a variable is both
of type INT, and between 1 and 200:
Example
<?php
$int
= 122;
$min
= 1;
$max
= 200;
if
(filter_var($int, FILTER_VALIDATE_INT, array("options" =>
array("min_range"=>$min, "max_range"=>$max))) ===
false) {
echo("Variable value is not within the
legal range");
}
else {
echo("Variable value is within the
legal range");
}
?>
Validate
IPv6 Address
The following
example uses the filter_var() function to check if the variable $ip is a valid
IPv6 address:
Example
<?php
$ip
= "2001:0db8:85a3:08d3:1319:8a2e:0370:7334";
if
(!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) === false) {
echo("$ip is a valid IPv6
address");
}
else {
echo("$ip is not a valid IPv6
address");
}
?>
Validate URL
- Must Contain QueryString
The
following example uses the filter_var() function to check if the variable $url
is a URL with a querystring:
Example
<?php
$url
= "https://www.Omega.com";
if
(!filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_QUERY_REQUIRED) === false)
{
echo("$url is a valid URL");
}
else {
echo("$url is not a valid URL");
}
?>
Remove
Characters With ASCII Value > 127
The
following example uses the filter_var() function to sanitize a string. It will
both remove all HTML tags, and all characters with ASCII value > 127, from
the string:
Example
<?php
$str
= "<h1>Hello WorldÆØÅ!</h1>";
$newstr
= filter_var($str, FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_HIGH);
echo
$newstr;
?>
Complete PHP
Filter Reference
For a
complete reference of all filter functions, go to our complete PHP Filter
Reference. Check each filter to see what options and flags are available.
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