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$tests = array(
"42",
1337,
0x539,
02471,
0b10100111001,
1337e0,
"not numeric",
array(),
9.1,
null
);

foreach ($tests as $element) {
if (is_numeric($element)) {
echo var_export($element, true) . " is numeric", PHP_EOL;
} else {
echo var_export($element, true) . " is NOT numeric", PHP_EOL;
}
}
------------------------------------------------------------
ctype_digit() - Check for numeric character(s)
is_bool() - Finds out whether a variable is a boolean
is_null() - Finds whether a variable is NULL
is_float() - Finds whether the type of a variable is float
is_int() - Find whether the type of a variable is integer
is_string() - Find whether the type of a variable is string
is_object() - Finds whether a variable is an object
is_array() - Finds whether a variable is an array

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