Create HTML table with arbitrary number of rows in PHP
Question
I know little about PHP so decided that the creation of a web-based tool for generating Red Hat kickstart files will be a good project to learn with. Among other things, the tool will parse a CSV file and generate a table containing the data taken from it. The input file is in the following format:
host1,10.153.196.248,255.255.255.0,10.153.196.1,00:50:56:ac:69:cb ,10.153.157.113,255.255.255.128,10.153.157.1, ,10.153.157.241,255.255.255.128,10.153.157.129, ,/home,10,,, ,swap,10,,, ,/opt,60,,, ,/data,30,,, ,,,,, host2,10.153.155.124,255.255.255.128,10.153.155.1,00:50:56:ac:69:ce ,10.153.157.114,255.255.255.128,10.153.157.1, ,10.153.157.242,255.255.255.128,10.153.157.129, ,/home,10,,, ,swap,10,,, ,/opt,60,,, ,/data,30,,, ,,,,,
Each section of text represents the information for one server. The fields are as follows:
hostname,eth0 IP, eth0 netmask, eth0 gateway, eth4 MAC null,eth1 IP, eth1 netmask, eth1 gateway, null blank,eth2 IP, eth2 netmask, eth2 gateway, null null,partition name, partition size in GB, null, null null,partition name, partition size in GB, null, null null,partition name, partition size in GB, null, null null,partition name, partition size in GB, null, null null,null,null,null,null
At the moment, I can parse it and generate a table with each row in the input file being a row in the table. The function that handles this:
function processFile($workFile) {
if (file_exists($workFile)) {
print '<table>';
$fh = fopen("$workFile", 'rb');
if ($fh) {
for ($line = fgets($fh); !feof($fh); $line = fgets($fh)) {
$line = trim($line);
$info = explode(',', $line);
print '<tr><td>' . $info[0] . '</td><td>' . $info[1] . '</td><td>' . $info[2] . '</td><td>' . $info[3] . '</td></tr>';
}
} else {
print "Failed to open $workFile";
}
print '</table>';
} else {
print "File $workFile does not exist";
}
}
Which generates:
host1 eth0 IP eth0 netmask eth0 gateway
eth1 IP eth1 netmask eth1 gateway
eth2 IP eth2 netmask eth2 gateway
partition 1 partition 1 size
partition 2 partition 2 size
partition 3 partition 3 size
partition 4 partition 4 size
host2 eth0 IP eth0 netmask eth0 gateway
eth1 IP eth1 netmask eth1 gateway
eth2 IP eth2 netmask eth2 gateway
partition 1 partition 1 size
partition 2 partition 2 size
partition 3 partition 3 size
partition 4 partition 4 size
This is a start. However, not every server is going to have four partitions. Some will have many more, some will have one or two fewer. And not knowing that information ahead of time puts a hindrance on what I want to do which is to add a row below the partition information for each server as well as probably break each server up into its own table. Something along the lines of this:
host1 eth0 IP eth0 netmask eth0 gateway
eth1 IP eth1 netmask eth1 gateway
eth2 IP eth2 netmask eth2 gateway
partition 1 partition 1 size
partition 2 partition 2 size
partition 3 partition 3 size
partition 4 partition 4 size
partition 5 partition 5 size
partition 6 partition 6 size
How many disks? [Text Field}
host2 eth0 IP eth0 netmask eth0 gateway
eth1 IP eth1 netmask eth1 gateway
eth2 IP eth2 netmask eth2 gateway
partition 1 partition 1 size
partition 2 partition 2 size
partition 3 partition 3 size
partition 4 partition 4 size
How many disks? [Text Field}
My prevailing thought is that I'm going to have to have a field in the CSV file indicate that the row contains partition information. It seems the easiest approach. I'm wondering if there is another means I could use, though, that doesn't require altering the format of the input file.
I'll also have to figure out how to use the line containing all null fields as the section delimiter.
Any thoughts on how I can approach this will be appreciated.
2 answers
solution1
0 ACCPTED 2012-10-30 22:26:24
echo('<table>');
$i = 0;
while($data = fgetcsv($fh)) {
echo('<tr>');
$cellTag = 'td';
if($i == 0) {
$cellTag = 'th';
}
$i++;
foreach($data as $cell) {
echo('<'.$cellTag.'>'.$cell.'</'.$cellTag.'>');
}
echo('</tr>');
}
echo('</table>');
Give that a try. Lemme know if it doesnt work first time. I'd have tested it, but i dont have a CSV file off hand.
solution2
0 2012-10-30 23:33:33
As you are parsing data that should match a particular format, it should be regular in nature, allowing you to use regular expression to strictly match the input you want (and throw away that you don't):
$rows = explode("\n", $input);
// @link http://stackoverflow.com/questions/106179/regular-expression-to-match-hostname-or-ip-address
$regIp = "(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])";
$regHost = "(([a-zA-Z]|[a-zA-Z][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z]|[A-Za-z][A-Za-z0-9\-]*[A-Za-z0-9])";
$hosts = array();
foreach ($rows as $row) {
$matches = null;
if (preg_match("/(?<host>$regHost),(?<ip>$regIp),(?<netmask>$regIp),(?<gateway>$regIp),(?<mac>.*)/", $row, $matches)) {
$host = $matches['host'];
$hosts[$host]['name'] = $matches['host'];
$hosts[$host]['mac'] = $matches['mac'];
$hosts[$host]['eth'][] = array(
'ip' => $matches['ip'],
'netmask' => $matches['netmask'],
'gateway' => $matches['gateway'],
);
} else if (preg_match("/,(?<ip>$regIp),(?<netmask>$regIp),(?<gateway>$regIp),/", $row, $matches)) {
$hosts[$host]['eth'][] = array(
'ip' => $matches['ip'],
'netmask' => $matches['netmask'],
'gateway' => $matches['gateway'],
);
} else if (preg_match("/,(?<name>.+),(?<size>\d+),,,/", $row, $matches)) {
$hosts[$host]['partition'][] = array(
'name' => $matches['name'],
'size' => $matches['size'],
);
} else if (preg_match("/,,,,,/", $row)) {
// we already partition output array with value of `$host` variable.
echo "Found terminating row\n";
} else {
echo "Unrecognised data on row: $row\n";
}
}
var_export($hosts);
Since we are dealing with a CSV file, one could also use $fields = str_getcsv($row) inside the loop to get an array containing each field. One would then need to count how many fields the array had, how many where empty and validate what each field contained.
Using a regular expression directly on the string representation of each CSV row allows us to strictly match all of the above in a single expression. The (?<var>...) parts of each regular expression are named matches. Using the input provided by OP, the above script outputs:
Found terminating row
Found terminating row
array (
'host1' =>
array (
'name' => 'host1',
'mac' => '00:50:56:ac:69:cb',
'eth' =>
array (
0 =>
array (
'ip' => '10.153.196.248',
'netmask' => '255.255.255.0',
'gateway' => '10.153.196.1',
),
1 =>
array (
'ip' => '10.153.157.113',
'netmask' => '255.255.255.128',
'gateway' => '10.153.157.1',
),
2 =>
array (
'ip' => '10.153.157.241',
'netmask' => '255.255.255.128',
'gateway' => '10.153.157.129',
),
),
'partition' =>
array (
0 =>
array (
'name' => '/home',
'size' => '10',
),
1 =>
array (
'name' => 'swap',
'size' => '10',
),
2 =>
array (
'name' => '/opt',
'size' => '60',
),
3 =>
array (
'name' => '/data',
'size' => '30',
),
),
),
'host2' =>
array (
'name' => 'host2',
'mac' => '00:50:56:ac:69:ce',
'eth' =>
array (
0 =>
array (
'ip' => '10.153.155.124',
'netmask' => '255.255.255.128',
'gateway' => '10.153.155.1',
),
1 =>
array (
'ip' => '10.153.157.114',
'netmask' => '255.255.255.128',
'gateway' => '10.153.157.1',
),
2 =>
array (
'ip' => '10.153.157.242',
'netmask' => '255.255.255.128',
'gateway' => '10.153.157.129',
),
),
'partition' =>
array (
0 =>
array (
'name' => '/home',
'size' => '10',
),
1 =>
array (
'name' => 'swap',
'size' => '10',
),
2 =>
array (
'name' => '/opt',
'size' => '60',
),
3 =>
array (
'name' => '/data',
'size' => '30',
),
),
),
)
As we now have an array of properly structured data, it should be trivial to output the data in any format required (ie. HTML table).
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