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PHP filter_has_var

PHP original manual for filter_has_var [ show | php.net ]

(PHP 5 >= 5.2.0, PHP 7)

filter_has_var — Checks if variable of specified type exists

bool filter_has_var ( int $type , string $variable_name )

type: One of INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER, or INPUT_ENV.
variable_name: Name of a variable to check.

Returns TRUE on success or FALSE on failure.