PHP MYSQL : Printing 2D arrays - php

Question

I have the following data inside one of my arrays :
array (size=3)
0 =>
array (size=4)
'ID' => string '1747' (length=4)
'OWNER' => string 'ME' (length=7)
'TABLENAME' => string 'MYFIRSTTABLE' (length=15)
'COLUMNNAME' => string 'MYFIRSTFIELD' (length=11)
1 =>
array (size=4)
'ID' => string '1756' (length=4)
'OWNER' => string 'ME' (length=7)
'TABLENAME' => string 'MYFIRSTTABLE' (length=15)
'COLUMNNAME' => string 'MYSECONDFIELD' (length=12)
2 =>
array (size=4)
'ID' => string '1757' (length=4)
'OWNER' => string 'ME' (length=7)
'TABLENAME' => string 'ANOTHERTABLE' (length=15)
'COLUMNNAME' => string 'ANOTHERFIELD' (length=16)
So far, everything is OK: I can loop through each rows and print them in a HTML table.
Something like this:
Now, I was wondering how to produce something like this:
I've tried some nested foreach, but without any success.
Thanks in advance for your help!

Answer 1

I think something like this should do what you want. It finds all the table names from the data (using array_unique on the output of array_column), then finds all the column names for each table (using array_filter, then array_values to re-index the keys of the array). It then loops over the tables and columns, outputting a table of table names and their column names:
$tables = array_unique(array_column($data, 'TABLENAME'));
$columns = array();
foreach ($tables as $tn) {
$columns[$tn] = array_values(array_filter($data, function ($v) use ($tn) {
return $v['TABLENAME'] == $tn;
}));
}
$max_columns = max(array_map(function ($v) { return count($v); }, $columns));
echo "<table>\n";
foreach ($tables as $tn) {
echo "<tr><td>$tn</td><td colspan=\"$max_columns\"></td></tr>\n";
echo "<tr><td></td>";
foreach ($columns[$tn] as $key => $column) {
echo "<td>{$column['COLUMNNAME']}</td>";
}
if ($key < $max_columns - 1) {
echo "<td colspan=\"" . ($max_columns - $key - 1) . "\"></td>";
}
echo "</tr>\n";
}
echo "</table>\n";
Output (for your sample data)
<table>
<tr>
<td>MYFIRSTTABLE</td>
<td colspan="2"></td>
</tr>
<tr>
<td></td>
<td>MYFIRSTFIELD</td>
<td>MYSECONDFIELD</td>
</tr>
<tr>
<td>ANOTHERTABLE</td>
<td colspan="2"></td>
</tr>
<tr>
<td></td>
<td>ANOTHERFIELD</td>
<td colspan="1"></td>
</tr>
</table>
Demo on 3v4l.org