PHP Tutorial String Filter

Basic

1. Check if a variable of a specified input type exist in PHP
2. Encode unwanted characters in PHP
3. Filter HTML-escapes special characters in PHP
4. Filter a variable with the specified filter in PHP
5. Filter multiple variables in PHP
6. Filter performs the addslashes() function to a string in PHP
7. Get an array of all supported filters in PHP
8. Get external variables (like form input) and filter them in PHP
9. Use FILTER_CALLBACK filter to call a user defined function to filter the value in PHP
10. Validate value against a Perl-compatible regular expression in PHP
11. Validate value as a boolean option in PHP

Number

1. Get the ID number of a specified filter in PHP
2. Remove all illegal characters from a float number in PHP
3. Remove all illegal characters from a number in PHP
4. Validate a value as a float number in PHP
5. Validate value as integer in PHP

URL

1. Remove all illegal URL characters from a string in PHP
2. Strip or URL-encodes unwanted characters in PHP
3. Validate URL with parametera in PHP
4. Validate value as a URL in PHP

Email

1. Remove all illegal e-mail characters from a string in PHP
2. Validate value as an e-mail address in PHP

IP

1. Validate the value as an IP address in PHP
2. Validate the value as an IPv6 address in PHP