如何检查PHP数组是否具有任何值？

我正在使用注册表单,我使用 PHP,在我的处理部分我运行一些代码,如果提交的项目失败,我然后将其添加到错误数组.

下面是一段代码,我正在找到最好的方法来确定是否应该触发错误.

所以如果在错误数组中设置了一个值,那么我需要重定向并做一些其他的东西.

我正在考虑使用isset或者is_array,但我不认为这是答案,因为我设置数组使用** $signup_errors = array()**这不会使is_array是真的吗？

任何人都可以建议一个很好的方式来做到这一点吗？

//at the beginning I set the error array
$signup_errors = array();

// I then add items to the error array as needed like this...
$signup_errors['captcha'] = 'Please Enter the Correct Security Code';

if ($signup_errors) {
  // there was an error
} else {
  // there wasn't
}

它是如何工作的？当转换为布尔值时,空数组将转换为false.每个其他数组转换为true.从PHP manual：

Converting to boolean

To explicitly convert a value to
boolean,use the (bool) or (boolean)
casts. However,in most cases the cast
is unncecessary,since a value will be
automatically converted if an
operator,function or control
structure requires a boolean argument.

See also Type Juggling.

When converting to boolean,the
following values are considered FALSE:

• the boolean FALSE itself
• the integer 0 (zero)
• the float 0.0 (zero)
• the empty string,and the string “0”
• an array with zero elements
• an object with zero member variables (PHP 4 only)
• the special type NULL (including unset variables)
• SimpleXML objects created from empty tags
• Every other value is considered TRUE (including any resource).

您也可以使用empty(),因为它具有类似的语义.