如何检查php中的数组中是否存在元素

Question

请让我尝试根据课程重新组合数组。例如，检查所有数组中是否存在“基本经济学”，然后返回与“基本经济学”匹配的所有数组元素的结果，而不是0,1,2等。

student => [
  0 => [
       "name" => "John Doe", 
    "gender" => "Male",
    "department" => "Economics",
    "courses" => [
                   "Elementary Economics",
                   "Principle of Economics",
                   "Macro Economics"
                   "Money Market"
                  ]
     ], 
  1 => [
     "name" => "John Doe", 
    "gender" => "Male",
    "department" => "Economics",
    "courses" => [
                   "Advanced Economics",
                   "Principle of Economics",
                   "Micro Economics"
                   "Money Market"
                  ]
    ]
    2 => [
       "name" => "John Doe", 
    "gender" => "Male",
    "department" => "Economics",
    "courses" => [
                   "Elementary Economics",
                   "Principle of Economics",
                   "Macro Economics"
                   "Value Market"
                  ]
    ]

 ]

我想按课程分组，我试过使用array_filter，它没有按照我的意愿工作，或者我做错了。

$result = array_filter($student, function ($item) use ($student['courses']) {
                    return \in_array($item, $student['courses'], true);
                }, \ARRAY_FILTER_USE_KEY);

Answer 1

我通过安装和使用array-group-by解决了我的问题

$ composer require mcaskill/php-array-group-by

$grouped = array_group_by( $student, "course" );