CODEWITHSUNDEEP
phppython
Undefined Variable
Undefined Variable

Reputation: 4267

Translate python to PHP (need to understand this python condition/iteration syntax)

I am reading through a python piece of code that I need to understand in order to port it in PHP. I can understand basic python syntax. However I came across following piece of code, and I do not really get it.

player = next((p for p in player_list if p['team'] == team), None)

As in, is it doing the following:

I just need to understand the syntax/grammar of above statement, so I can write equivalent in PHP. I unable to figure it out since PHP does not support such constructs. Any help is appreciated

Upvotes: 1

Views: 49

Answers (1)

deceze
deceze

Reputation: 522135

That is a generator expression with a conditional. p for p in player_list iterates through all values in player_list and yields them, but only if p['team'] == team. next advances the iterator and gets its next value. Usually that would end in a StopIteration exception if the iterator reaches its end [without finding a value], which the second None parameter prevents; next will return None instead of raising the exception.

In short: this snippet finds the first player in player_list who is of team team, if there's none then None is assigned to player. In PHP the closest equivalent is something like:

$player = array_reduce($playerList, function ($a, $p) use ($team) {
    return $a ?: $p['team'] == $team ? $p : null;
});

or:

$player = array_filter($playerList, function ($p) use ($team) { 
    return $p['team'] == $team;
})[0] ?? null;

Though note neither is short-circuiting like next is but both variations iterate the entire array. Therefore you'd probably use a foreach loop with an if and a break instead.

Upvotes: 2

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