note 23305 modified in function.usort by danbrown
| From: | danbrown@php.net | Date: | Sun, 23 Jan 2011 16:31:59 +0000 |
| Subject: | note 23305 modified in function.usort by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-176083@lists.php.net to get a copy of this message | ||
Here is a simple example of converting a timestamp date("U") into a date. This sorts by
that day and then by string value alphabetically.
I hope it saves someone some time... Happy PHP'in!
<?php
//data to sort
$shared[0]["page_id"] = "2025731470";
$shared[1]["page_id"] = "2025731450";
$shared[2]["page_id"] = "1025731456";
$shared[3]["page_id"] = "1025731460";
$shared[0]["username"] = "larry";
$shared[1]["username"] = "alvin";
$shared[2]["username"] = "garth";
$shared[3]["username"] = "harvy";
//function to convert timestamp to date
function convert_timestamp($timestamp){
$limit=date("U");
$limiting=$timestamp-$limit;
return date ("Ymd", mktime (0,0,$limiting));
}
//comparison function
function cmp ($a, $b) {
$l=convert_timestamp($a["page_id"]);
$k=convert_timestamp($b["page_id"]);
if($k==$l){
return strcmp($a["username"], $b["username"]);
}else{
return strcmp($k, $l);
}
}
//sort array
usort($shared, "cmp");
//display sorted info
while (list ($key, $value) = each ($shared)) {
echo "\$shared[$key]: ";
echo $value["page_id"];
echo " username: ";
echo $value["username"];
echo "<break_tag>";
}
?>
This will output:
$shared[0]: 2025731450 username: alvin
$shared[1]: 2025731470 username: larry
$shared[2]: 1025731456 username: garth
$shared[3]: 1025731460 username: harvy
--was--
Here is a simple example of converting a timestamp date("U") into a date. This sorts by
that day and then by string value alphabetically.
I hope it saves someone some time... Happy PHP'in!
//data to sort
$shared[0]["page_id"] = "2025731470";
$shared[1]["page_id"] = "2025731450";
$shared[2]["page_id"] = "1025731456";
$shared[3]["page_id"] = "1025731460";
$shared[0]["username"] = "larry";
$shared[1]["username"] = "alvin";
$shared[2]["username"] = "garth";
$shared[3]["username"] = "harvy";
//function to convert timestamp to date
function convert_timestamp($timestamp){
$limit=date("U");
$limiting=$timestamp-$limit;
return date ("Ymd", mktime (0,0,$limiting));
}
//comparison function
function cmp ($a, $b) {
$l=convert_timestamp($a["page_id"]);
$k=convert_timestamp($b["page_id"]);
if($k==$l){
return strcmp($a["username"], $b["username"]);
}else{
return strcmp($k, $l);
}
}
//sort array
usort($shared, "cmp");
//display sorted info
while (list ($key, $value) = each ($shared)) {
echo "\$shared[$key]: ";
echo $value["page_id"];
echo " username: ";
echo $value["username"];
echo "<break_tag>";
}
//This will output:
$shared[0]: 2025731450 username: alvin
$shared[1]: 2025731470 username: larry
$shared[2]: 1025731456 username: garth
$shared[3]: 1025731460 username: harvy
http://php.net/manual/en/function.usort.php