is_iterable

定義和用法

is_iterable()函數檢查變量的內容是否是可迭代的值。

如果變量是可迭代的，則該函數返回true (1)，否則返回false /無返回值。

實例

檢查變量的內容是否是可迭代的值：

 <?php
$a = "Hello" ;
echo "a is " . is_iterable ( $a ) . "<br>" ;

$b = array ( "red" , "green" , "blue" ) ;
echo "b is " . is_iterable ( $b ) . "<br>" ;

$c = array ( "Peter" => "35" , "Ben" => "37" , "Joe" => "43" ) ;
echo "c is " . is_iterable ( $c ) . "<br>" ;

$d = [ 1 , 2 , 3 ] ;
echo "d is " . is_iterable ( $d ) . "<br>" ;
?>

親自試一試

文法

is_iterable ( variable ) ;