is_null
is_object
Variable handling Funkcje
PHP Manual

# is_numeric

(PHP 4, PHP 5)

is_numeric — Finds whether a variable is a number or a numeric string

### Opis

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 notation (0xFF) is allowed too but only without sign, decimal and exponential part.

### Parametry

`var`

  The variable being evaluated.

### Zwracane wartości

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

### Przykłady

Przykład #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;
}
}
?>`

### Zobacz też:

- 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

is_null
is_object
Variable handling Funkcje
PHP Manual