Use PHP's own filter function for data validation
Use PHP's own filter function for data validation
PHP filters contain two types of
Validation:Used to verify that a validation entry is valid
sanitization:Used to format the validated item, so it may modify the value of the validation entry, remove the illegal character, and so on.
refer to the official PHP documentation: Filter function Daquan
Reference Source: http://www.lai18.com/content/410997.html
Input_filters_list ()
Used to list all filters supported by the current system.
$filter) { echo $filter. ' '. filter_id ($filter). " \ n ";}?" >
The above code will output the following information
Filter Name
Filter ID
Int
257
Boolean
258
Float
259
Validate_regexp
272
Validate_url
273
Validate_email
274
Validate_ip
275
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
Each filter will have a unique ID. Each of these filters can be used by the Filter_var () function. Here's how it will be used. Note that the above string and Strippedid are the same, because they are the same filter, or two aliases of the same filter.
Filtering Data
Using the Filter_var () method to filter the data, here is a simple filter example
The above code will be the data of an integer type 1234, because the $int variable passes the validation of the integer type, this time change the contents of the $int variable
At this point in the run code, it is found that there is no variable output, because the $in variable is not validated, so this method returns
bool (FALSE)。 It is also important to note that even $int= "returns BOOL (false)
Integer Validation
The preceding sections of the code simply verify that a given value is an integer example. In fact Filter_validate_int also provides validation of the range of values, let's verify a variable, determine if it is an integer, and verify that its value is between 50 and 100
$min, "max_range" = $max)); 42?>
Run the above code, found that 42 was output, and did not find any errors, this is why AH? When you originally wanted to add additional validation rules to your validation, you need to pass a
Options' The array of keys, to the following:
Array ("min_range" = $min, "max_range" =-$max)));? >
Run the above code, the page will not have any output, because it returns
false, stating that the validation was successful.
This method can also be used to verify the range of negative numbers
This also supports single-range values, which specify only a maximum or minimum range, such as:
Array (' min_range ' = $min))); 12?>
The code above verifies that $int is greater than (not equal to) the value of an integer type $min, runs the code, and outputs 12
validating a set of variables
The above examples simply validate a single value, so what if a set of variables is validated? The answer is to use Filter_var_array (). The function can validate multiple different types of data at the same time. Let's start with a simple example:
$value) { echo $key. '--'. $value. '
'; }? >
Run the above code with the output as follows:
0--101--1092--3---12344--5--6--Array
octal and hexadecimal
The Filter_validate_int filter supports both octal and hexadecimal, both of which are:
Filter_flag_allow_hex
Filter_flag_allow_octal
Passing Flags with arrays
Filter_flag_allow_hex)); 255?>
BOOLEAN Authentication Filter_validate_boolean
The above code output 1, because the filter found a valid Boolean value, the following list of other values can return true
1
"1"
"Yes"
"True"
"On"
TRUE
The following values will return False
0
"0"
"No"
"False"
"Off"
“”
Null
FALSE
It also supports the following usage
In the above code, we first judged that the In_array function executed successfully, and returned true, so the last code output true
We can also pass an array to determine the Boolean type of the values in the array
The above code output is as follows:
Array (6) { [0] = = bool (false) [1] = bool (true) [2] = bool (false) [3] = = BOOL (false) [ 4] = = BOOL (false) [5] = = Array (5) { [0] = bool (false) [1] = bool (true) [2] = bool (false ) [3] = = BOOL (false) [4] = = BOOL (false) }}
floating-point verification filter_validate_float
floating-point verification of arrays
As with other validations, you can also perform floating-point validation on an array. Similar to Boolean validation, provides a Flgs filter_require_array.
The above code output is as follows
Array (7) { [0] = float (1.2) [1] = = Float (1.7) [2] = bool (false) [3] = = Float (-23234.123) C4/>[4] = bool (false) [5] = bool (false) [6] = = Array (0) {}}
Floating-point filters allow us to specify a delimiter between numbers
",", " 1.234" and ":", "1.2e3" = "," ); /*** validate the floats against the user defined decimal seperators ***/ foreach ($floats as $float = $dec _sep)
{ $out = Filter_var ($float, Filter_validate_float, Array ("options" = = Array ("decimal" = $dec _sep))); /*** dump the results ***/ var_dump ($out); }? >
In the above code, the first element in the $floats function has a value of ', ', so it is given a delimiter of ', ' when judging a value of 1,234, so it returns true.
The full return value of the above code
Float (1.234) Warning:filter_var () [Function.filter-var]: Decimal separator must is one char in/www/filter.php on line 13b Ool (FALSE) bool (false)
Verify URL Filter_validate_url
URL validation is a very difficult behavior, due to the uncertainty of the URL, it does not have the maximum length limit, and its format is diverse, you can read the RfC 1738来 some information about the URL. You can then create a class to validate all IPv4 and IPv6 URLs, as well as validation of some other URLs. You can also simply use Filter_validate_url to verify the URL.
"; }? >
The example above uses a simple if statement to determine whether a given URL is legitimate, but not all URLs are in this format. Sometimes a URL can be an IP address, or it may pass multiple parameters in a URL. Here are a few flags to help us verify the URL:
filter_flag_scheme_required– The URL is required to be an RFC-compatible URL. (Example: http://cg.am)
filter_flag_host_required– Requires the URL to contain the hostname (for example: http://levi.cg.com)
filter_flag_path_required– Requires a URL to have a path after the hostname (for example: http://levi.cg.am/test/phpmailer/)
filter_flag_query_required– Requires a query string for the URL (for example: http://levi.cg.am/?p=2618)
It can be found that the above code does not pass validation
IP Filter Filter_validate_ip
The FILTER_VALIDATE_IP filter validates the value as an IP.
Name: "Validate_ip"
id-number:275
Possible flags:
Filter_flag_ipv4– The required value is a valid IPv4 IP (e.g., 255.255.255.255)
Filter_flag_ipv6– The required value is a valid IPV6 IP (e.g., 2001:0db8:85a3:08d3:1319:8a2e:0370:7334)
Filter_flag_no_priv_range– Required value is an RFC-specified private domain IP (e.g. 192.168.0.1)
Filter_flag_no_res_range– The requirement value is not within the reserved IP range. The flag accepts IPV4 and IPV6 values.
EMAIL Filter Filter_validate_email
The Filter_validate_email filter validates the value as an e-mail address.
Custom Filter Filter_callback
The Filter_callback filter uses a user-defined function to filter the values.
This filter provides us with complete control over the data filtering.
The specified function must be stored in an associative array named "Options".
"Convertspace"));? >
Output
peter_is_a_great_guy!
-
1 Floor u0112524023 hours ago
-
Thanks
