A PHP Error was encountered

Severity: Warning

Message: Declaration of Page_banner::update($idx) should be compatible with MY_Model::update($idx, $data)

Filename: customize/Page_banner.php

Line Number: 98

Backtrace:

File: /home2/beta/public_html/lupopi/application/helpers/header_helper.php
Line: 153
Function: model

File: /home2/beta/public_html/lupopi/application/views/front/blog/main.php
Line: 1
Function: get_page_banner

File: /home2/beta/public_html/lupopi/application/controllers/Blog.php
Line: 214
Function: view

File: /home2/beta/public_html/lupopi/application/controllers/Blog.php
Line: 224
Function: article

File: /home2/beta/public_html/lupopi/index.php
Line: 317
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: Declaration of Page_banner::upload_image($idx, $sub_idx) should be compatible with MY_Model::upload_image($idx, $temp_key = NULL)

Filename: customize/Page_banner.php

Line Number: 110

Backtrace:

File: /home2/beta/public_html/lupopi/application/helpers/header_helper.php
Line: 153
Function: model

File: /home2/beta/public_html/lupopi/application/views/front/blog/main.php
Line: 1
Function: get_page_banner

File: /home2/beta/public_html/lupopi/application/controllers/Blog.php
Line: 214
Function: view

File: /home2/beta/public_html/lupopi/application/controllers/Blog.php
Line: 224
Function: article

File: /home2/beta/public_html/lupopi/index.php
Line: 317
Function: require_once

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A PHP Error was encountered

Severity: Notice

Message: Trying to access array offset on value of type bool

Filename: blog/detail.php

Line Number: 19

Backtrace:

File: /home2/beta/public_html/lupopi/application/views/front/blog/detail.php
Line: 19
Function: _error_handler

File: /home2/beta/public_html/lupopi/application/controllers/Blog.php
Line: 213
Function: view

File: /home2/beta/public_html/lupopi/application/controllers/Blog.php
Line: 224
Function: article

File: /home2/beta/public_html/lupopi/index.php
Line: 317
Function: require_once

" alt="

A PHP Error was encountered

Severity: Notice

Message: Trying to access array offset on value of type bool

Filename: blog/detail.php

Line Number: 19

Backtrace:

File: /home2/beta/public_html/lupopi/application/views/front/blog/detail.php
Line: 19
Function: _error_handler

File: /home2/beta/public_html/lupopi/application/controllers/Blog.php
Line: 213
Function: view

File: /home2/beta/public_html/lupopi/application/controllers/Blog.php
Line: 224
Function: article

File: /home2/beta/public_html/lupopi/index.php
Line: 317
Function: require_once

" class="img-fluid">

[php] 從 array 中取值 / get an element from an array

2013 Jan 18 未分類

這是個再簡單不過的問題了

$value = $arr[$key];

不就搞定了嘛?

因為我常用一個 array 的方式

把一整沱的東西傳進 function 裡面

用 array 的好處是

如果某個參數不需要傳遞的時候

空下來就好

如果用 function parameter 的方式

會變成這樣

call_function(null, null, null, need_value);

會變很醜

而且時間久了

誰知道第幾個參數是什麼意思?

以跟隨法人的某一段 function code 來說

function get_list($para=array())

{

$type = @$para['type'];

$action = @$para['action'];

$size = @$para['size'];

}

我會用這種方法去傳遞參數

但是這個其實不是標準用法

我只是用 @ 的方式把錯誤訊息避開

寫 code 的時候很忌諱這種方法

因為你只是裝做沒看到錯誤

錯誤還是存在的

而且如果 CodeIgniter 有開 log 記錄一些錯誤訊息

你就會看到你的 log 充滿了這種記錄

ERROR - 2013-01-18 05:43:34 --> Severity: Notice --> Undefined variable: pare /Applications/XAMPP/xamppfiles/htdocs/stock/application/models/broker_trade.php 88

意思就是

這種錯誤的寫法遲早要改的啦!!!

剛查了一下如何檢查 array 中是否有某個 key/value 的 pair 的相關 function

歸納出這個寫法

$symbol = array_key_exists('symbol', $para) ? $para['symbol'] : null;

這樣 php 就不會噴 error

而且就算沒有傳數值進來, 接收的變數也會收到 null

只要之後的 error handling 有做好就好

--

2013-04-01 補充

果然人家早就把這種 function 寫好了

請參考 CodeIgniter Array Helper

一行搞定

element()

從陣列中讀取元素，此函數會檢查陣列索引是否已設定，且陣列值是否存在。若存在則傳回陣列值，否則傳回False或是任何你所指定的預設值（透過函數第三個參數設定）。參考範例如下：

$array = array('color' => 'red', 'shape' => 'round', 'size' => '');

// 回傳 "red"

echo element('color', $array);

// 回傳 NULL

echo element('size', $array, NULL);