Php check if object with property exists in array

Question

Let's assume I have the following PHP code:

$a = new a();
$a->id = 1;

I then have an array $m of objects of type type a (but they really could be of any type). I want to check if any object in m has property id equal to 1. In Java, I'd do something like:

myList
.stream()
.filter(x <- x.id == a.id)
.count();

In PHP I tried

in_array($a, $m)

but that didn't seem to do work, because obviously even if another object had the same ID it would still be a different object.

I could obviously use a loop, but as really I'd want to check if any object in an array n had a corresponding object with the same ID in m I'd rather avoid a nested loop.

Looking for in_array($a->id, $m)????

devpro
– devpro

2016-02-26 22:51:13 +00:00
Commented Feb 26, 2016 at 22:51 — devpro
– devpro, Commented Feb 26, 2016 at 22:51
this might help stackoverflow.com/questions/17231925/…

tofutim
– tofutim

2016-02-26 22:51:53 +00:00
Commented Feb 26, 2016 at 22:51 — tofutim
– tofutim, Commented Feb 26, 2016 at 22:51

felipsmartins · Accepted Answer · 2016-02-26 23:08:25Z

8

PHP also has an array filtering functioning, which (for obvious reasons) is called array_filter() and does what you want, with anonymous functions.

function findAllWithId($objects, $id) {
    return array_filter($objects, function($toCheck) use ($id) { 
        return $toCheck->id == $id; 
    });
}

edited Feb 26, 2016 at 23:08

felipsmartins

13.6k4 gold badges51 silver badges58 bronze badges

answered Feb 26, 2016 at 22:51

Erik

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5 Comments

A.L Over a year ago

Should you add $objects as a function's parameter?

felipsmartins Over a year ago

@A.L Yep, It should be.

fusion3k Over a year ago

there are two syntax errors, missing object in arg and use( $id )

Erik Over a year ago

This is what I get for coding after midnight :+ Fixed.

felipsmartins Over a year ago

I think it would be a lot clearer whether $toCheck was renamed to $object instead. Also, It seems function is not need here. Anyway, nice answer.

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