Get all values with a certain key value [duplicate] - php

Question

This question already has answers here:
Is there a function to extract a 'column' from an array in PHP?
(15 answers)
Closed last month.
So I've been trying to figure this out for a while now and seem to be stuck. I have a multidimensionalarray and I'm trying to output all values with a certain key. Here is the code:
//My Array:
$services = array(
array( service_name => 'facebook',
service_title => 'Facebook',
service_order => 0,
service_type => 'Social Networking'
),
array( service_name => 'twitter',
service_title => 'Twitter',
service_order => 0,
service_type => 'Social Networking'
),
array( service_name => 'tumblr',
service_title => 'MySpace',
service_order => 0,
service_type => 'Blogging'
)
);
The problem is I want to output the values by service_type for example "Social Networking" or "Blogging" I'm able to do this if I use a foreach statement like so:
foreach($services as $service) {
if ($service['service_type'] == 'Social Networking') {
echo($service['service_title']);
}
if ($service['service_type'] == 'Blogging') {
echo($service['service_title']);
}
}
which works fine until I try to add a title in between types like
foreach($services as $service) {
if ($service['service_type'] == 'Social Networking') {
echo($service['service_title']);
}
echo ('<h3> Blogging</h3>');
if ($service['service_type'] == 'Blogging') {
echo($service['service_title']);
}
}
I've learned enough to know that is because of the way foreach loops work so I've been trying to do this with something like while($service['service_type'] == 'Social Networking') (which creates a fun infinite loop) and various other ways.
Ideally I want to sort the array by service_type and then display the results without having to run the foreach loop in between headers.
Any help on this would be awesome or even other suggestions on ways to do this.

Answer 1

With php > 5.5 you can do
$myData = array(
array(
'service_name' => 'facebook',
'service_title' => 'Facebook',
'service_order' => 0,
'service_type' => 'Social Networking'
),
array(
'service_name' => 'twitter',
'service_title' => 'Twitter',
'service_order' => 0,
'service_type' => 'Social Networking'
),
array(
'service_name' => 'tumblr',
'service_title' => 'MySpace',
'service_order' => 0,
'service_type' => 'Blogging'
)
);
$filtered = array_column($myData, 'service_column');
see: http://www.php.net/manual/en/function.array-column.php

Answer 2

I think you are trying to do something like this:
// Create an array containing all of the distinct "service types"
// from the $services array
$service_types = array();
foreach ($services as $service) {
// If we have not yet encountered this entry's "service type",
// then we need to add it to our new array
if (!in_array($service['service_type'], $service_types)) {
$service_types[] = $service['service_type'];
}
}
if (count($service_types)) {
// For each "service type", we want to echo a header and then
// a list of services of that type
foreach ($service_types as $current_type) {
echo '<h3>'.$current_type.'</h3>';
// Loop through the services and echo those that are
// of the correct type
foreach ($services as $service) {
if ($service['service_type'] == $current_type) {
echo($service['service_title']);
}
}
}
} else {
echo '<h3>No services</h3>'
}

Answer 3

I haven't followed all of your question, but you asked if you can sort the array by service type - so you can build a user defined sorting function.
function sortByServiceType($a, $b) {
// This will sort them by service type alphabetically
return strcmp($a['service_type'], $b['service_type']);
}
uasort($services, 'sortByServiceType');