(PHP 4, PHP 5)
is_numeric — Finds whether a variable is a number or a numeric string
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 notation (0xFF) is allowed too but only without sign, decimal and exponential part.
var
The variable being evaluated.
Returns TRUE if var is a number or a numeric
string, FALSE otherwise.
Example #1 is_numeric() examples
<?php
$tests = array(
"42",
1337,
"1e4",
"not numeric",
array(),
9.1
);
foreach ($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 '1e4' is numeric 'not numeric' is NOT numeric 'Array' is NOT numeric '9.1' is numeric