PHP Sort a array by specific value - php

Question

i want so replace something in a array, but the array isn´t sorted. So maybe you know how i can fix the problem.
I´ve a array with a few of this element.
<media type="image" id="image5" label="book5.jpg" group="image" source="list2/Schuh2.jpg" url="image5/0.jpg" icon="image5/0.jpg"/>
How can i sort the array by the value of lable? so that first i get for example from
Lables:
book3
book4
book2
-->
book2
book3
book4
i hope you know what i mean :D thank you ;-)

Answer 1

$books = array('book3', 'book4', 'book2');
sort($books);
or
$books = array('label1' =>'book5.jpg',
'label2' => 'book4.jpg', 'label3' => 'book3.jpeg');
asort($books); // sorts by value (ascending)
hope this helps!

Answer 2

Hack
foreach($a as $k => $media) {
$parts = explode(' ',$media);
foreach($parts as $part) {
$kv = explode('=', $part);
if ($kv[0] == 'label') {
$a[$kv[1]] = $media;
unset($a[$k]);
}
}
}
ksort($a);
or look at usort() which let you use your own comparison function

Answer 3

Assuming unique book#.jpg images you could do something like ...
<?php
$sortedArray = array();
foreach ($unsortedArray as $item ) {
$sortedArray[explode('.', explode('label="book', $item)[1])[0]] = $item;
}
ksort($sortedArray);
foreach ($sortedArray as $item ) {
echo $item;
}
?>
I did not test this.
UPDATE:
Someone else's suggestion to use usort() is a good one. Something like this ...
<?php
function compareElements($a, $b) {
$aNum = explode('.', explode('label="book', $a)[1])[0];
$aNum = explode('.', explode('label="book', $b)[1])[0];
return ($aNum < $bNum) ? -1 : 1;
}
usort($arrayOfElements, "compareElements");
foreach ($arrayOfElements as $element) {
echo $element;
}
?>

Answer 4

The Problem was, that i can´t sorte bei the one value ['id'] so i has create me one array with all the Informations, and a second only with the ['id'] of the pictures.
Input and load the XML-File.
$mashTemplateFile = 'C:\Users\...\test.xml';
$mashTemplate = simplexml_load_file($mashTemplateFile);
$mash = $mashTemplate->mash;
declare the arry's
$imageArrayMedTemp = array();
$imageArrayMedID = array();
$imageArrayMed = array();
put all the information from the media in the array $imageArrayMedTemp and only the ['id']into the array $imageArrayMedID.
foreach ($mash->media as $med) {
if ($med['type'] == 'image') {
array_push($imageArrayMedTemp , $med);
array_push($imageArrayMedID , $med['id']);
}
now i sort the array with the ['id']'s
natsort($imageArrayMedID);
after sorting i will put the information from the array $imageArrayMedTemp into a new array $imageArrayMed, storing by when the key of both is the same.
foreach ($imageArrayMedID as $key1 => $value1) {
foreach ($imageArrayMedTemp as $key2 => $value2) {
if($key1 == $key2){
array_push($imageArrayMed,$value2);
}
}
}