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如何修復Undefined Index錯誤訊息

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Mark ChangMark Chang
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錯誤的原因是因為當我們使用 $_GET 和 $_POST 方法取得變數時會發生這種情況,雖然PHP的部分即使沒有宣告設置變數,我們也可以使用,但就是會出現錯誤訊息。
除非你想要把錯誤訊息隱藏例如在$_GET 和 $_POST前面加上@

但若要解決就可以使用 isset() 函數在引用之前檢查變數是否已宣告設置。
例如

if(isset($_GET['valuename'])){
$name = $_GET['valuename'];
}
if(isset($_POST['valuename'])){
$name = $_POST['valuename'];
}

又或者可以使用
$name = isset($_GET[‘valuename’]) ? $_GET[‘valuename’]: “Variable is not set”;

以上紀錄~
 

#故事  #isset  #php  #Undefined Index  
https://innstory.com/story-如何修復Undefined_Index錯誤訊息-3003
PHP

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Mark Chang

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