PHP in_array（）无法正常工作

我在下面有一个if陈述，它检查数组中是否存在值，如果不存在，则将其添加到数组中。显然，即使该值在数组中，也会再次触发它。PHP in_array（）无法正常工作

据我明白，它应该只每个值的显示器1中，因为它只会触发3次，这样的：

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

的代码：

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>"; 

}

但它输出：

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

这里是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" }

谢谢你的帮助！

来源

2016-04-28 William

在哪里/如何最初分配'$ courseList'？ –

'$ courseList = array（）;'循环外部。 – William

in_array()方法检查数组值，而不是键。从你的例子我可以看到，作为值你有一个数组与name和seconds字段。我想你想检查你的数组中是否存在该ID。

所以这if：

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

应该是这样的变化：

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

这样你检查$unit['course_name']是你的阵列的关键英寸

来源

2016-04-28 16:10:58

太完美了！它回答了我的问题，并教会我更多的PHP！队友的欢呼声！ – William

PHP in_array（）无法正常工作

回答

相关问题