- Tags: PHP Filter
- Categories: PHP Functions, PHP Reference, Reference
Quick Reference
The PHP filter_input() function gets an external variable from insecure sources (e.g., user input) and optionally filters it to validate variables.
<?php
if (!filter_input(INPUT_GET, 'email', FILTER_VALIDATE_EMAIL)) {
echo('Email is not valid');
}
else {
echo('Email is valid');
}
?>
Output
// checks if the external variable "email" is sent to the PHP page, through the "get" method, and also check if it is a valid email address
Syntax
filter_input(type, variable, filter, options)
Parameters
| Parameter | Description |
|---|---|
| type | The input type to check for (required):
|
| variable | The variable name to check (required) |
| filter | Specifies the ID or name of the filter to use (default is FILTER_DEFAULT, which results in no filtering) |
| options | Specifies one or more flags/options to use |
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PHP NOTES:
- When using PHP, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
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