May 11, 2021 PHP
For data in PHP, you need to verify that it is secure, and the Filter function helps with this.
PHP filters are used to validate and filter data from non-secure sources, such as user input.
The Filter function is part of the PHP core. These functions can be used without installation.
PHP: Indicates the earliest version of PHP that supports the function.
| function | describe | PHP |
|---|---|---|
| filter_has_var() | Check if there is a variable that specifies the input type. | 5 |
| filter_id() | Returns the ID number of the specified filter. | 5 |
| filter_input() | Get input from the outside of the script and filter it. | 5 |
| filter_input_array() | Get multiple inputs from the outside of the script and filter it. | 5 |
| filter_list() | Returns an array containing all the supported filters. | 5 |
| filter_var_array() | Get multiple variables and filter it. | 5 |
| filter_var() | Get a variable and filter it. | 5 |
| ID name | describe |
|---|---|
| FILTER_CALLBACK | Call the user-defined function to filter data. |
| FILTER_SANITIZE_STRING | Remove the label, remove or encode special characters. |
| FILTER_SANITIZE_STRIPPED | The alias of the "String" filter. |
| FILTER_SANITIZE_ENCODED | URL-ENCODE string, remove or encode special characters. |
| FILTER_SANITIZE_SPECIAL_CHARS | HTML escape character '"<> & and ASCII values are less than 32 characters. |
| FILTER_SANITIZE_EMAIL | Delete all characters, except for letters, numbers, and! # $% & '* + - / =? ^ _ `{|} ~ @. |
| FILTER_SANITIZE_URL | Delete all characters, except for letters, numbers, and $ -_. +! * '(), {} | \ ^ ~ [] `<> #%"; /?: @ & = |
| FILTER_SANITIZE_NUMBER_INT | Delete all characters, in addition to numbers and + - |
| FILTER_SANITIZE_NUMBER_FLOAT | Delete all characters, in addition to numbers, + -, and., EE |
| FILTER_SANITIZE_MAGIC_QUOTES | Apply addslashes (). |
| FILTER_UNSAFE_RAW | Do not perform any filtration, removal, or encoding special characters. |
| FILTER_VALIDATE_INT | Valide the value as an integer. |
| FILTER_VALIDATE_BOOLEAN | Take the value as the Boolean option to verify.Returns true if "1", "True", "ON" and "Yes".If it is "0", "False", "Off", "NO", ", then returns false.Otherwise returns NULL. |
| FILTER_VALIDATE_FLOAT | Value the value as the floating point number. |
| FILTER_VALIDATE_REGEXP | Valid values according to Regexp (a regular expression that is compatible with Perl). |
| FILTER_VALIDATE_URL | Take the value as the URL to verify. |
| FILTER_VALIDATE_EMAIL | Take the value as an E-Mail address to verify. |
| FILTER_VALIDATE_IP | Turn the value as an IP address, only IPv4 or IPv6 or is not from private or reserved ranges. |
The security of your data is important, so take a closer look at this section!