is_iterable()

(PHP 7 >= 7.1.0)

Verify that the contents of a variable is an iterable value

说明

Verify that the contents of a variable is accepted by theiterablepseudo-type, i.e. that it is either anarrayor an object implementingTraversable

参数

The value to check

返回值

ReturnsTRUEif$varis iterable,FALSEotherwise.

范例

Example #1is_iterable()examples

参见

• is_array() 检测变量是否是数组

A slight correction to brcontainer's polyfill, which prevents errors on a non-object in a non-blocking way, and also corrects the issue of the conditional checking "file_exists" instead of the correct "function_exists":
if ( !function_exists( 'is_iterable' ) )
{
  function is_iterable( $obj )
  {
    return is_array( $obj ) || ( is_object( $obj ) && ( $obj instanceof \Traversable ) );
  }
}
The original answer would not have resolved correctly, because it was looking for a file instead of a function, and the provided method would error if given a non-iterable non-object value such as false.

Here is more details on iterable type: http://php.net/manual/en/language.types.iterable.php

Polyfill for PHP5.6 and PHP7.0
  if (!file_exists('is_iterable')) {
    function is_iterable($obj)
    {
      return is_array($obj) || $obj instanceof \Traversable;
    }
  }

鹏仔微信 15129739599 鹏仔QQ344225443 鹏仔前端 pjxi.com 共享博客 sharedbk.com