(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:
is_int() -
Please login to continue.