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PHP: Manual
PHP Manual by the PHP Documentation Group php.net
PHP Manual
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is_numeric

(PHP 4 , PHP 5)

is_numeric --  Finds whether a variable is a number or a numeric string

Description

bool is_numeric ( mixed var)

Returns TRUE if var is a number or a numeric string, FALSE otherwise.

See also is_bool(), is_float(), is_int(), is_string(), is_object(), and is_array().

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