is_real

定義和用法

is_real()函數檢查變量是否為float 類型。

該函數是is_float()的別名。

實例

檢查變量是否為float 類型：

 <?php
$a = 32 ;
echo "a is " . is_real ( $a ) . "<br>" ;

$b = 0 ;
echo "b is " . is_real ( $b ) . "<br>" ;

$c = 32.5 ;
echo "c is " . is_real ( $c ) . "<br>" ;

$d = "32" ;
echo "d is " . is_real ( $d ) . "<br>" ;

$e = true ;
echo "e is " . is_real ( $e ) . "<br>" ;

$f = "null" ;
echo "f is " . is_real ( $f ) . "<br>" ;

$g = 1.e3 ;
echo "g is " . is_real ( $g ) . "<br>" ;
?>

親自試一試

文法

is_real ( variable ) ;