is_numeric
(PHP 4, PHP 5, PHP 7, PHP 8)
is_numeric — Finds whether a variable is a number or a numeric string
Description
Determines if the given variable is a number or a numeric string.
Parameters
-
value -
The variable being evaluated.
Return Values
Returns true if value is a number or a
numeric string,
false otherwise.
Changelog
| Version | Description |
|---|---|
| 8.0.0 |
Numeric strings ending with whitespace ("42 ") will now
return true. Previously, false was return instead.
|
Examples
Example #1 is_numeric() examples
<?php
$tests = array(
"42",
1337,
0x539,
02471,
0b10100111001,
1337e0,
"0x539",
"02471",
"0b10100111001",
"1337e0",
"not numeric",
array(),
9.1,
null,
'',
);
foreach ($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;
}
}
?>
The above example will output:
'42' is numeric 1337 is numeric 1337 is numeric 1337 is numeric 1337 is numeric 1337.0 is numeric '0x539' is NOT numeric '02471' is numeric '0b10100111001' is NOT numeric '1337e0' is numeric 'not numeric' is NOT numeric array ( ) is NOT numeric 9.1 is numeric NULL is NOT numeric '' is NOT numeric
Example #2 is_numeric() with whitespace
<?php
$tests = [
" 42",
"42 ",
" 9001", // non-breaking space
"9001 ", // non-breaking space
];
foreach ($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;
}
}
?>
Output of the above example in PHP 8:
' 42' is numeric '42 ' is numeric ' 9001' is NOT numeric '9001 ' is NOT numeric
Output of the above example in PHP 7:
' 42' is numeric '42 ' is NOT numeric ' 9001' is NOT numeric '9001 ' is NOT numeric
See Also
- Numeric strings
- 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
- filter_var() - Filters a variable with a specified filter
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