PHP in_array（）無法正常工作

我在下面有一個if陳述，它檢查數組中是否存在值，如果不存在，則將其添加到數組中。顯然，即使該值在數組中，也會再次觸發它。PHP in_array（）無法正常工作

據我明白，它應該只每個值的顯示器1中，因爲它只會觸發3次，這樣的：

Digital Photography -> 0 
Step by Step Macintosh Training -> 0 
How to become a Powerful Speaker -> 0

的代碼：

if (!in_array($unit['course_name'], $courseList)) { 

    $courseList[$unit['course_name']]['name'] = $unit['course_name']; 
    $courseList[$unit['course_name']]['seconds'] = 0; 
    echo $courseList[$unit['course_name']]['name'] . ' -> ' . $courseList[$unit['course_name']]['seconds']; 
    echo "<BR>"; 

}

但它輸出：

Digital Photography -> 0 
Step by Step Macintosh Training -> 0 
Step by Step Macintosh Training -> 0 
Step by Step Macintosh Training -> 0 
How to become a Powerful Speaker -> 0 
How to become a Powerful Speaker -> 0

這裏是var_dump($unit)：

array(8) { ["author_name"]=> string(10) "tuiuiu_dev" [0]=> string(10) "tuiuiu_dev" ["course_name"]=> string(19) "Digital Photography" [1]=> string(19) "Digital Photography" ["unit_id"]=> string(3) "181" [2]=> string(3) "181" ["unit_quantity"]=> string(1) "1" [3]=> string(1) "1" } 
array(8) { ["author_name"]=> string(15) "William Merussi" [0]=> string(15) "William Merussi" ["course_name"]=> string(31) "Step by Step Macintosh Training" [1]=> string(31) "Step by Step Macintosh Training" ["unit_id"]=> string(3) "227" [2]=> string(3) "227" ["unit_quantity"]=> string(1) "1" [3]=> string(1) "1" } 
array(8) { ["author_name"]=> string(15) "William Merussi" [0]=> string(15) "William Merussi" ["course_name"]=> string(31) "Step by Step Macintosh Training" [1]=> string(31) "Step by Step Macintosh Training" ["unit_id"]=> string(3) "231" [2]=> string(3) "231" ["unit_quantity"]=> string(1) "1" [3]=> string(1) "1" } 
array(8) { ["author_name"]=> string(15) "William Merussi" [0]=> string(15) "William Merussi" ["course_name"]=> string(31) "Step by Step Macintosh Training" [1]=> string(31) "Step by Step Macintosh Training" ["unit_id"]=> string(3) "233" [2]=> string(3) "233" ["unit_quantity"]=> string(1) "1" [3]=> string(1) "1" } 
array(8) { ["author_name"]=> string(10) "tuiuiu_dev" [0]=> string(10) "tuiuiu_dev" ["course_name"]=> string(32) "How to become a Powerful Speaker" [1]=> string(32) "How to become a Powerful Speaker" ["unit_id"]=> string(4) "1080" [2]=> string(4) "1080" ["unit_quantity"]=> string(1) "1" [3]=> string(1) "1" } 
array(8) { ["author_name"]=> string(10) "tuiuiu_dev" [0]=> string(10) "tuiuiu_dev" ["course_name"]=> string(32) "How to become a Powerful Speaker" [1]=> string(32) "How to become a Powerful Speaker" ["unit_id"]=> string(4) "1084" [2]=> string(4) "1084" ["unit_quantity"]=> string(1) "1" [3]=> string(1) "1" }

謝謝你的幫助！

來源

2016-04-28 William

在哪裏/如何最初分配'$ courseList'？ –

'$ courseList = array（）;'循環外部。 – William

in_array()方法檢查數組值，而不是鍵。從你的例子我可以看到，作爲值你有一個數組與name和seconds字段。我想你想檢查你的數組中是否存在該ID。

所以這if：

if (!in_array($unit['course_name'], $courseList)) {

應該是這樣的變化：

if (!isset($courseList[$unit['course_name']])) {

這樣你檢查$unit['course_name']是你的陣列的關鍵英寸

來源

2016-04-28 16:10:58

太完美了！它回答了我的問題，並教會我更多的PHP！隊友的歡呼聲！ – William

PHP in_array（）無法正常工作

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