is_numeric

(PHP 4, PHP 5, PHP 7)
Finds whether a variable is a number or a numeric string
bool is_numeric ( mixed $var )

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 not allowed.

Parameters:
var

The variable being evaluated.

Returns:

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

Changelog:
7.0.0

Strings in hexadecimal (e.g. 0xf4c3b00c) notation are no longer regarded as numeric strings, i.e. is_numeric() returns FALSE now.

Examples:
is_numeric() 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:

'42' is numeric
'1337' is numeric
'1337' is numeric
'1337' is numeric
'1337' is numeric
'1337' is numeric
'not numeric' is NOT numeric
'Array' is NOT numeric
'9.1' is numeric
See also:

ctype_digit() -

is_bool() -

is_null() -

is_float() -

is_int() -

is_string() -

is_object() -

is_array() -

doc_php
2016-02-24 16:13:58
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