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Detailed explanation of functions that come with PHP to verify whether email, URL, and IP are legal
Detailed explanation of functions that come with PHP to verify whether email, URL, and IP are legal
In the past, I used PHP to verify whether the email, URL, and IP were legal by writing regular rules myself. However, sometimes I was confused and might write a regular rule that was not completely correct, causing verification errors. Today I discovered that PHP itself automatically With functions to verify whether the email, URL, and IP are legal
The filter_var function is mainly used.
Syntax
filter_var(variable, filter, options)
Parameter description
variable Required. Specifies the variables to filter.
filter Optional. Specifies the ID of the filter to use.
options Specifies an array containing flags/options. Check the possible flags and options for each filter.
PHP Filters
| ID Name | Description |
|---|---|
| FILTER_CALLBACK | Call user-defined function to filter data. |
| FILTER_SANITIZE_STRING | Remove tags, remove or encode special characters. |
| FILTER_SANITIZE_STRIPPED | "string" Alias for the filter. |
| FILTER_SANITIZE_ENCODED | URL-encode string, remove or encode special characters. |
| ##FILTER_SANITIZE_SPECIAL_CHARS | HTML escape characters ‘”<>& and characters with ASCII values less than 32.|
| FILTER_SANITIZE_EMAIL | Remove all characters except letters, numbers and !#$%&'* -/=?^_`{| }~@.[] |
| FILTER_SANITIZE_URL | Remove all characters except letters, numbers and $-_. !*'(), {}|\\^~[]`<>#%”;/?:@&= |
| #FILTER_SANITIZE_NUMBER_INT | Delete all characters , except numbers and -|
| FILTER_SANITIZE_NUMBER_FLOAT | Remove all characters except numbers, - and.,eE.|
| FILTER_SANITIZE_MAGIC_QUOTES | Apply addslashes().|
| FILTER_UNSAFE_RAW | Does not do any filtering, stripping or encoding of special characters. |
| FILTER_VALIDATE_INT | Validates values as integers in the specified range. |
| FILTER_VALIDATE_BOOLEAN | If it is "1", "true", "on" and "yes", then return true, if it is " 0″, “false”, “off”, “no” and “”, then false is returned. Otherwise NULL is returned. |
| FILTER_VALIDATE_FLOAT | Validate the value as a floating point number. |
| FILTER_VALIDATE_REGEXP | Validates values based on regexp, a Perl-compatible regular expression. |
| FILTER_VALIDATE_URL | Validate the value as a URL. |
| FILTER_VALIDATE_EMAIL | Validate the value as an e-mail. |
| FILTER_VALIDATE_IP | Validate the value as an IP address. |
Example #1 A filter_var() example
<?php var_dump(filter_var('bob@example.com', FILTER_VALIDATE_EMAIL)); var_dump(filter_var('http://example.com', FILTER_VALIDATE_URL, FILTER_FLAG_PATH_REQUIRED)); ?>
The above routine will output:
string(15) "bob@example.com" bool(false)
The above is the content of this article All content, I hope it will be helpful to everyone's study.
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