Many functions are depicted by PHP filters to check the input given by the user which makes the form validation easier. To check this list of functions, use filter_list()
function.
Output:
[html]
Filter Name Filter ID
int 257
boolean 258
float 259
validate_regexp 272
validate_url 273
validate_email 274
validate_ip 275
validate_mac 276
string 513
stripped 513
encoded 514
special_chars 515
full_special_chars 522
unsafe_raw 516
email 517
url 518
number_int 519
number_float 520
magic_quotes 521
callback 1024
[/html]
[php]
<!DOCTYPE html>
<html>
<body>
<?php
$str="<script>\"SPLessons PHP Tutorial\"</script>";
echo filter_var($str,FILTER_SANITIZE_STRING,FILTER_FLAG_NO_ENCODE_QUOTES);
/*
OUTPUT
"SPLessons PHP Tutorial"
*/
?>
</body>
</html>
[/php]
Output:
[html]"SPLessons PHP Tutorial"[/html]
[php]
<!DOCTYPE html>
<html>
<body>
<?php
$no=67;
$min=10;
$max=100;
echo filter_var($no,FILTER_VALIDATE_INT,array("options"=>array("min_range"=>$min,"max_range"=>$max)));
?>
</body>
</html>
[/php]
Output: 67
[php]
<!DOCTYPE html>
<html>
<body>
<?php
$email1 = "hello world";
$email2 = "splessons@gmail.com";
// Remove all illegal characters from email
$email1 = filter_var($email1, FILTER_SANITIZE_EMAIL);
$email2 = filter_var($email2, FILTER_SANITIZE_EMAIL);
// Validate e-mail1
if (!filter_var($email1, FILTER_VALIDATE_EMAIL) === false) {
echo("$email1 is a valid email address");
} else {
echo("$email1 is not a valid email address<br>");
}
// Validate e-mail2
if (!filter_var($email2, FILTER_VALIDATE_EMAIL) === false) {
echo("$email2 is a valid email address");
} else {
echo("$email2 is not a valid email address");
}
?>
</body>
</html>
[/php]
Output:
[php]
helloworld is not a valid email address
splessons@gmail.com is a valid email address
[/php]
[php]
<!DOCTYPE html>
<html>
<body>
<?php
$url1 = "http://www.splessons.com";
$url2 = "splessons.com";
// Remove all illegal characters from a url
$url1 = filter_var($url1, FILTER_SANITIZE_URL);
$url2 = filter_var($url2, FILTER_SANITIZE_URL);
// Validate url1
if (!filter_var($url1, FILTER_VALIDATE_URL) === false) {
echo("$url1 is a valid URL<br>");
} else {
echo("$url1 is not a valid URL");
}
// Validate url2
if (!filter_var($url2, FILTER_VALIDATE_URL) === false) {
echo("$url2 is a valid URL");
} else {
echo("$url2 is not a valid URL");
}
?>
</body>
</html>
[/php]
Output:
[php]
http://www.splessons.com is a valid URL
splessons.com is not a valid URL
[/php]