使用字符在PHP中分组

Question

I have an array like:

    array{
     0 => string 'B.E - ECE',
     1 => string 'B.E - EEE',
     2 => string 'Msc - Maths',
     3 => string 'Msc - Social',
}

So how can I make the array into groups like:

B.E. => ECE, EEE
Msc => Maths,Social

?

I want to do it in PHP. Can anybody help me how to achieve it ?

Answer 1

So is your array split by the "-" character?

so it's Key - Value pairs split by commas?

Ok -

(edit: section removed to clarify answer)

Following conversation and some rearrangement of the question, a second try at a solution, with the above assumptions, try this:

$array = array {
     0 => string 'B.E - ECE' (length=9)
     1 => string 'B.E - EEE' (length=9)
     2 => string 'Msc - Maths' (length=11)
     3 => string 'Msc - Social' (length=12)
}


foreach ($array as $row){
$piece = explode("-",$row);
$key = $piece[0];
$newArray[$key][] = $piece[1];
unset($piece);
}
unset($row) ///tidy up

This will output two arrays each of two arrays:

$newArray[Msc] = array("Maths","Social");
$newArray[B.E] = array("ECE","EEE");

What I did was cause the Foreach loop to automatically add onto the array if the key exists with $newArray[$key][] so that the values are automatically collected by key, and the key is defined as the first half of the original array values.

Printing:

To print the result:

foreach($newArray as $key=>$newRow){
/// there are two rows in this case, [B.E] and [MSc]
print $key.":<br>";
print "<pre>";
///<pre> HTML tag makes output use linebreaks and spaces. neater.
print_r($newRow);
///alternatively use var_dump($newRow);
print "</pre>";
}

Alternatively if you wish to print a known named variable you can write:

print_r($newArray['B.E']);

Which will print all the data in that array. print_r is very useful.