组数组一起使公共值成为关键

Question

Array ( 
    [0] => Array ( 
        [c_id] => 1 
        [semester] => 1 
        [level] => 100 
        [code] => ges 101 
        [title] => english language 
        [units] => 3 
        [lecturer] => aboh 
        [department] => philosophy 
        [matric] => 487 
        [session] => 2011/2012 
    ) 
    [1] => Array ( 
        [c_id] => 2 
        [semester] => 1 
        [level] => 100 
        [code] => phi 102 
        [title] => aristotelian logic 
        [units] => 3 
        [lecturer] => offor 
        [department] => philosophy 
        [matric] => 487 
        [session] => 2011/2012 
    ) 
    [2] => Array ( 
        [c_id] => 3 
        [semester] => 1 
        [level] => 100 
        [code] => ges 102 
        [title] => methodology 
        [units] => 3 
        [lecturer] => akunne 
        [department] => philosophy 
        [matric] => 487 
        [session] => 2011/2012 
    )  
    [16] => Array ( 
        [c_id] => 28 
        [semester] => 1 
        [level] => 200
        [code] => phi 209 
        [title] => introduction to epistemology 
        [units] => 3 
        [lecturer] => akunne 
        [department] => philosophy 
        [matric] => 487 
        [session] => 2011/2012 
    ) 
    [17] => Array ( 
        [c_id] => 29 
        [semester] => 1 
        [level] => 200 
        [code] => phi 207 
        [title] => philosophy of mind 
        [units] => 3 
        [lecturer] => akoleowo 
        [department] => philosophy 
        [matric] => 487 
        [session] => 2011/2012 
    ) 
    [18] => Array ( 
        [c_id] => 30 
        [semester] => 1 
        [level] => 200 
        [code] => rcs 211 
        [title] => introduction to old testament 
        [units] => 2 
        [lecturer] => acha 
        [department] => philosophy 
        [matric] => 487 
        [session] => 2011/2012 
    )
    [19] => Array ( 
        [c_id] => 31 
        [semester] => 1 
        [level] => 200 
        [code] => phi 204 
        [title] => philosophy of nature 
        [units] => 3 
        [lecturer] => mbukanma 
        [department] => philosophy 
        [matric] => 487 
        [session] => 2011/2012 
    )

我希望将数组组合在一起，使公共值成为一个关键，例如将100作为一个键，并在其所属的特定层中获取数组的所有值。

Answer 1

试试这个：

$array = ... //your array
$groupedArray = array();

foreach ($array as $item) {
    $groupedArray[$item['level']][] = $item;
}

这就是你想要的吗？