PHP merge a two-dimensional array

1. this problem is mainly caused by the merging of two-dimensional arrays of P in the PH operation; 2. the initial array is as follows: {code ...} 3. the following array is expected: {code ...} 4. I hope I can get a reply to my first question. The younger brother was puzzled by this problem (no good answer was found, so reached out once) (in a hurry) 1. this problem is mainly caused by the merge of two-dimensional arrays of PH operation P;

2. the initial array is as follows:

$ Course = array ('course _ name' => 'higher Mathematics ', 'major _ name' => 'computer professional ', 'school _ name' => 'A University '), array ('course _ name' => 'higher Mathematics', 'major _ name' => 'physical specialize ', 'school _ name' => 'A University '), array ('course _ name' => 'higher Mathematics', 'major _ name' => 'Japanese major ', 'school _ name' => 'A University '), array ('course _ name' => 'Introduction to Marx', 'major _ name' => 'computer professional ', 'school _ name' => 'University of B '))

3. expected to get the following array:

$ Course = array ('course _ name' => 'advanced Mathematics ', 'major _ name' => array ('computer specialization', 'physical specialization ', 'Japanese major '), 'School _ name' => 'University A'), array ('course _ name' => 'Introduction to Marx ', 'Major _ name' => array ('computer major '), 'School _ name' =>' B University '))

4. I hope I can get a reply to my first question. The younger brother was confused by this question (no good answer was found, so reached out once) (in a hurry)

Reply content:

1. this problem is mainly caused by the merge of two-dimensional arrays of P operated by PH;

2. the initial array is as follows:

$ Course = array ('course _ name' => 'higher Mathematics ', 'major _ name' => 'computer professional ', 'school _ name' => 'A University '), array ('course _ name' => 'higher Mathematics', 'major _ name' => 'physical specialize ', 'school _ name' => 'A University '), array ('course _ name' => 'higher Mathematics', 'major _ name' => 'Japanese major ', 'school _ name' => 'A University '), array ('course _ name' => 'Introduction to Marx', 'major _ name' => 'computer professional ', 'school _ name' => 'University of B '))

3. expected to get the following array:

$ Course = array ('course _ name' => 'advanced Mathematics ', 'major _ name' => array ('computer specialization', 'physical specialization ', 'Japanese major '), 'School _ name' => 'University A'), array ('course _ name' => 'Introduction to Marx ', 'Major _ name' => array ('computer major '), 'School _ name' =>' B University '))

4. I hope I can get a reply to my first question. The younger brother was confused by this question (no good answer was found, so reached out once) (in a hurry)

First, the dimension of a piece of data is as follows:
"_ Course": [major 1, [major 2, major 3]
Therefore, we need to take the university course as the only difference

// Upload your $ course data $ majors = array (); foreach ($ course as $ item) {extract ($ item); $ key = "{$ school_name }: {$ course_name} "; if (! Isset ($ majors [$ key]) {$ majors [$ key] = array ("course_name" => $ course_name, "school_name" => $ school_name, "major_name" => array ($ major_name);} else {// key record exists and major_name is not repeated. append marjor_name if (! In_array ($ marjor_name, $ majors [$ key] ['major _ name']) {$ majors [$ key] ['major _ name'] [] = $ marjor_name ;}}// extract an array $ majors = array_values ($ majors ); print_r ($ majors); // This is what you want

$ Result = array (); foreach ($ course as $ val) {if (! Isset ($ result [$ val ['School _ name']. $ val ['course _ name'] ['major _ name']) {$ result [$ val ['School _ name']. $ val ['course _ name'] ['major _ name'] = array (); $ result [$ val ['School _ name']. $ val ['course _ name'] ['course _ name'] = $ val ['course _ name']; $ result [$ val ['School _ name']. $ val ['course _ name'] ['School _ name'] = $ val ['School _ name'];} array_push ($ result [$ val ['School _ name']. $ val ['course _ name'] ['major _ name'], $ val ['major _ name']);} var_dump (array_values ($ result )); // the output result is as follows: array (2) {[0] => array (3) {["major_name"] => array (3) {[0] => string (15) "computer major" [1] => string (12) "Physical major" [2] => string (12) "Japanese major"} ["course_name"] => string (12) "advanced mathematics" ["school_name"] => string (10) "A university"} [1] => array (3) {["major_name"] => array (1) {[0] => string (15) "Computer major"} ["course_name"] => string (15) "Introduction to Marx" ["school_name"] => string (10) "a B University "}}