PHP filter_input () function
Complete PHP Filter Reference Definition and Usage
filter_input () function to get input (such as form input), and filtered from the outside of the script.
This function is used for variables from the non-secure sources for authentication, such as user input.
This function can take input from a variety of sources:
- INPUT_GET
- INPUT_POST
- INPUT_COOKIE
- INPUT_ENV
- INPUT_SERVER
- INPUT_SESSION (not yet implemented)
- INPUT_REQUEST (not yet implemented)
If successful, the filtered data is returned. If it fails, it returns FALSE. If the "variable" parameter is not set, it returns NULL.
grammar
filter_input(input_type, variable, filter, options)
| 参数 | 描述 |
|---|---|
| input_type | 必需。规定输入类型。参见上面的列表中可能的类型。 |
| variable | 必需。规定要过滤的变量。 |
| filter | 可选。规定要使用的过滤器的 ID。默认是 FILTER_SANITIZE_STRING。参见 完整的 PHP Filter 参考手册 ，查看可能的过滤器。 过滤器 ID 可以是 ID 名称（比如 FILTER_VALIDATE_EMAIL）或 ID 号（比如 274）。 |
| options | 可选。规定一个包含标志/选项的关联数组或者一个单一的标志/选项。检查每个过滤器可能的标志和选项。 |
Examples
In this example, we use filter_input () function to filter a POST variable. POST variable received is legitimate e-mail address:
<?php
if (!filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL))
{
echo "E-Mail is not valid";
}
else
{
echo "E-Mail is valid";
}
?>
if (!filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL))
{
echo "E-Mail is not valid";
}
else
{
echo "E-Mail is valid";
}
?>
Output code is as follows:
E-Mail is valid
Complete PHP Filter Reference