调用静态方法时发生致命错误 [英] Fatal Error when calling static method
问题描述
所以，这是我的情况：
- 我正在使用CodeIgniter
- 我已经设置一个助手，（在'DK'文件夹下的'string_helper'）
-
我已经在dk / string_helper.php
- I'm using CodeIgniter
- I've set up a helper, ('string_helper' under 'DK' folder)
I've set up the dkString class in dk/string_helper.php
static function strInArray($str,$arr)
{
foreach ($arr as $item)
{
if (self::inString($str,$item))
return true;
}
return false;
}
- 我正在加载帮助程序（
$ this-> load-> helper（'dk / string'）;） - 调用方法（
dkString :: strInArray（$ str，$ arr）;）
- I'm loading the helper (
$this->load->helper('dk/string');) - Calling the method (
dkString::strInArray($str,$arr);) - 我已经将类的静态方法加载到自定义帮助程序中，如100次。因此，它没有任何问题。
- 该函数是否声明为
static无关紧要。 - I've loaded class's static methods residing in a custom helper, like 100 times. So there's nothing wrong with it.
- It doesn't matter whether the function is declared as
staticor not. Normally it works, no matter what.
注意：
但是，我一直收到以下错误：
However, I keep getting the following error :
致命错误：在第XX行
/the/path/to/the/caller/file.php中调用未定义的方法dkString :: strInArray（） >
Fatal error: Call to undefined method dkString::strInArray() in /the/path/to/the/caller/file.php on Line XX
任何想法可能有什么问题吗？
Any ideas what might be wrong?
<?php
/*
* DK4PHP Library
*
* Copyright (c) 2010-2012 by Dr.Kameleon
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
if (!class_exists('dkString'))
{
class dkString
{
/**
* Return number of character in string
*
* @param type $str
* @return type
*/
function characterCount($str)
{
return strlen($str);
}
/**
* Check if str begins with...
* @param type $str
* @param type $sub
* @return type
*/
function beginsWith($str, $sub)
{
return (substr($str,0,strlen($sub)) == $sub);
}
/**
* Check if str ends with...
*
* @param type $str
* @param type $sub
* @return type
*/
function endsWith($str, $sub)
{
return (substr($str,strlen($str)-strlen($sub)) == $sub);
}
/**
* Check if str contains substring
*
* @param type $sub
* @param type $str
* @param type $casesensitive
* @return type
*/
function inString($sub, $str, $casesensitive = false)
{
if ($casesensitive)
return (strstr($str, $sub) == false) ? false : true;
else
return (stristr($str, $sub) == false) ? false : true;
}
/**
* Count number of occurences of substring in string
*
* @param type $sub
* @param type $str
* @return type
*/
function inStringCount($sub, $str)
{
return substr_count($str, $sub);
}
/**
* Convert string to number
*
* @param type $str
* @param type $check
* @param type $magic
* @return type
*/
function strtonum($str, $check, $magic)
{
$int32Unit = 4294967296;
$length = strlen($str);
for ($i = 0; $i < $length; $i++)
{
$check *= $magic;
if ($check >= $int32Unit)
{
$check = ($check - $int32Unit * (int) ($check / $int32Unit));
$check = ($check < -2147483648) ? ($check + $int32Unit) : $check;
}
$check += ord($str{$i});
}
return $check;
}
/**
* Get index of str in array (check if is contained)
*
* @param type $str
* @param type $arr
*/
function indexInArray($str,$arr)
{
foreach ($arr as $index=>$item)
{
if (stristr($item,$str))
{
return ($index+1);
break;
}
}
return -1;
}
/**
* Check if str is contained in any of array's elements
*
* @param type $str
* @param type $arr
* @return boolean
*/
function strInArray($str,$arr)
{
foreach ($arr as $item)
{
if (self::inString($str,$item))
return true;
}
return false;
}
}
}
?>
更新：
在我的控制器中，加载了辅助程序（ $ this-> load-> helper（'dk / string'）; ）之后，我尝试了：
In my controller, after loading the helper ($this->load->helper('dk/string');), I tried :
if (class_exists('dkString')) { echo "IT EXISTS<br/>Methods : "; print_r(get_class_methods('dkString')); }
else echo "IT DOESN'T EXIST";
有趣的事情是输出为：
IT EXISTS
Methods : Array (
[0] => characterCount
[1] => beginsWith
[2] => endsWith
[3] => inString
[4] => inStringCount
[5] => strtonum
[6] => indexInArray )
简而言之：该类已加载，并且看到了所有方法（除了最后一个）。 Geezz ...：/
In a few words : the class IS loaded, and it "sees" ALL methods (except for the last one). Geezz... :/
推荐答案
尝试使公开 功能。
public static function strInArray($str,$arr) {
foreach ($arr as $item) {
if (self::inString($str,$item))
return true;
}
return false;
}
编辑：您的口译员可以找不到班级。然后他找不到静态方法。也许您可以与 class_exists 一起检查课程，然后上课。
Its possible that your interpreter can't find the class. Then he can't find the static method. Perhaps you can check with class_exists wheather the class is there and loaded.
Edit2：
您必须将您的函数声明为静态函数。否则，您将无法使用静态运算符（：:)调用该函数。
You have to declare you function as static function. Otherwise you cannot call the function with the static operator(::).
http://php.net/manual/de/language.oop5.static.php
没有人在聊天...但是错误消息非常明确。您尝试调用静态函数，但该函数不是静态函数，因此您得到的信息就很重要。
So no one is in chat... but the error message is really clear. You try to call a static function but that function is not a static function so you get the message you get on top.
否则，将它们作为实例上的函数进行调用
Otherwise call them as a function over an instance
$dkString = new dkString;
$res = $dfString->strInArray();
使用内部功能如 in_array 来查找数组中的字符串。
Perhaps its easier when you use internal functions like in_array to find a string in an array.
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