IS_NUMERIC(3) 1 IS_NUMERIC(3)
is_numeric - Finds whether a variable is a number or a numeric string
SYNOPSIS
bool is_numeric (mixed $var)
DESCRIPTION
Finds whether the given variable is numeric. Numeric strings consist of optional sign, any number of digits, optional decimal part and
optional exponential part. Thus +0123.45e6 is a valid numeric value. Hexadecimal (e.g. 0xf4c3b00c), Binary (e.g. 0b10100111001), Octal
(e.g. 0777) notation is allowed too but only without sign, decimal and exponential part.
PARAMETERS
o $var
- The variable being evaluated.
RETURN VALUES
Returns TRUE if $var is a number or a numeric string, FALSE otherwise.
EXAMPLES
Example #1
is_numeric(3) examples
<?php
$tests = array(
"42",
1337,
0x539,
02471,
0b10100111001,
1337e0,
"not numeric",
array(),
9.1
);
foreach ($tests as $element) {
if (is_numeric($element)) {
echo "'{$element}' is numeric", PHP_EOL;
} else {
echo "'{$element}' is NOT numeric", PHP_EOL;
}
}
?>
The above example will output:
SEE ALSO
ctype_digit(3), is_bool(3), is_null(3), is_float(3), is_int(3), is_string(3), is_object(3), is_array(3).
PHP Documentation Group IS_NUMERIC(3)
