I have an string like this:-
$sa_position = "state/Gold,International/Participant,School/Participant,School/Bronze,national/Bronze,School/Gold";
And I want filter this string somehow to get top 3 prizes and sort by prizes(e.g. state/Gold,state/Gold,national/Bronze)
You do not have a delimiter on the explode function.
explode ( string $delimiter , string $string [, int $limit ] )
Tada! Here is your sort. Simple but elegant :)
<?php
$sa_position = explode(",", "state/Gold,International/Participant,School/Participant,School/Bronze,national/Bronze,School/Gold");
//$new = sortMedals($sa_position, array('Gold', 'Silver', 'Bronze', 'Participant'));
$gold = array();
$silver = array();
$bronze = array();
$participated = array();
foreach($sa_position as $item)
{
if(stripos($item, "silver"))
$silver[] = $item;
else if(stripos($item, "bronze"))
$silver[] = $item;
else if(stripos($item, "gold"))
$gold[] = $item;
else if(stripos($item, "participant"))
$participated[] = $item;
}
$new = array_merge($gold, $silver, $bronze, $participated);
print_r($new);
?>
There's quite a few problems in your code. Here's what you should do:
explode needs a delimiter. You want to separate it by commas, so do explode(",","state/Gold,International/Participant,School/Participant,School/Bronze,national/Bronze,School/Gold").What you need is a beautiful function called array_filter. It's one of the few really great things in PHP, so bear me for a little while I explain how it works.
It takes two arguments: the array, and a function.
It returns an array containing only the elements that, once passed to the function, will return true.
Let's come back to your particular case. To check if a string contains a substring (that is, to check if in a given array element there is a 'Participant' string) you can use strpos($haystack, $needle). It will return the position of your substr, or FALSE if it is not present.
Another concept (solution is coming) we will use is pretty new in php, and is called "anonymous function". It's a function created on the fly, without a name, usually to be used as callback.
Here is the code:
$string = "state/Gold,International/Participant,School/Participant,School/Bronze,national/Bronze,School/Gold";
$new_array = array_filter(
explode(",",$string), //so, every element of this array gets checked against
function ($var) { //this function here. if true is returned, it goes in $new_array
return (strpos($haystack, 'Participant')=== NULL);
}
);
