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Functions and Filters

To filter a variable, use one of the following filter functions:

• filter_var() - Filters a single variable with a specified filter
• filter_var_array() - Filter several variables with the same or different filters
• filter_input - Get one input variable and filter it
• filter_input_array - Get several input variables and filter them with the same or different filters

In the example below, we validate an integer using the filter_var() function:

if(!filter_var($int, FILTER_VALIDATE_INT))
{
echo("Integer is not valid");
}
else
{
echo("Integer is valid");
}
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