is_iterable

    (PHP 7 >= 7.1.0, PHP 8)

    is_iterable — 验证变量的内容是否为可迭代值

    说明

    is_iterable(mixed $value): bool

    验证变量的内容是否被 iterable 伪类型接受，即不是 array，就是实现了 Traversable 接口的对象。

    参数

    value

    验证的值

    返回值

    如果 value 可迭代返回 true，否则返回 false。

    示例

    示例 #1 is_iterable() 示例

    <?php

    var_dump    (is_iterable([1, 2, 3])); // bool(true)
    var_dump(is_iterable(new ArrayIterator([1, 2, 3]))); // bool(true)
    var_dump(is_iterable((function () { yield 1; })())); // bool(true)
    var_dump(is_iterable(1)); // bool(false)
    var_dump(is_iterable(new stdClass())); // bool(false)

    ?>

    参见

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    用户贡献的备注 2 notes

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    mopsyd at me dot com
    7 years ago
    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.
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