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PHP Quiz PHP CertificatePHP filter_has_var() Function
Complete PHP Filter Reference
Definition and Usage
The filter_has_var() function checks if a variable of a specified input type exist.
Returns TRUE on success or FALSE on failure.
Syntax
filter_has_var(type, variable)
| Parameter | Description |
|---|---|
| type | Required. Specifies the type to check for Possible input types:
|
| variable | Required. Specifies the variable to check |
Example
In this example the input variable "name" is sent to the PHP page:
<?php
if(!filter_has_var(INPUT_GET, "name"))
{
echo("Input type does not exist");
}
else
{
echo("Input type exists");
}
?>
if(!filter_has_var(INPUT_GET, "name"))
{
echo("Input type does not exist");
}
else
{
echo("Input type exists");
}
?>
The output of the code should be something like this:
Input type exists
Complete PHP Filter Reference
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