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.
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