sorting part of a multidimensional array
I have an multi dimensional array:
$array[0] = array ( name => "Bob",
position => "Chair",
email => "bob@foo.bar"
);
$array[1] = array ( name => "Al",
position => "",
email => "al@foo.bar"
);
//etc..
I want to sort it so that those whose position != "" are first, then the rest alphabetically by name... I'm not very familiar w/ sorting multidimensional arrays, c开发者_高级运维ould someone help me? Thanks!
<?php
$array[0] = array ( name => "Bob", position => "Chair", email => "bob@foo.bar");
$array[1] = array ( name => "Al", position => "",email => "al@foo.bar");
print_r($array);
$idxPos = array();
for ($i=0;$i<count($array);$i++)
{
$idxPos[$i] = $array[$i]["position"];
}
arsort($idxPos);
$arrayNew = array();
$sortedKeys = array_keys($idxPos);
for($p=0;$p<count($idxPos);$p++)
{
$arrayNew[] = $array[$sortedKeys[$p]];
}
$array = $arrayNew;
print_r("<br />");
print_r($array);
?>
The usort
function is probably your best bet for this:
usort($array, function($a, $b) {
if (empty($a['position']) && !empty($b['position'])) {
return 1;
}
else if (!empty($a['position']) && empty($b['position'])) {
return -1;
}
else {
return strcmp($a['name'], $b['name']);
}
});
Anonymous functions were introduced in PHP 5.3.0. If you're using an earlier version you can just define a regular function instead:
function cmp($a, $b) {
if (empty($a['position']) && !empty($b['position'])) {
return 1;
}
else if (!empty($a['position']) && empty($b['position'])) {
return -1;
}
else {
return strcmp($a['name'], $b['name']);
}
}
usort($array, 'cmp');
You'll probably want to try usort so you can use a custom sorting function. In the sorting function you can check a["position"] vs b["position"] in the way you describe.
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