How can I remove duplicates in an object array in PHP?

Question

I have an object like this:

class FanStruct{
    public $date; 
    public $userid;

    function __construct($date, $id){
        $this->date = $date;
        $this->userid = $id;
    }
}

I have maximum of 30 of them in an array, and they are sorted by $userid.

What is the best way to go though the array, and remove duplicate objects based on $userid (ignoring $date)?

Although this is an old question and there's already a good accepted answer, it's worth mention you can (and should) use SORT_REGULAR as explained here: stackoverflow.com/a/18203564/1412157 — LucaM
– LucaM, Commented Apr 7, 2016 at 8:23

Tiago Peres · Accepted Answer · 2021-03-15 08:54:52Z

8

Here's a simple test that at least should get you started. Your __toString method might need to be more elaborate to generate uniqueness for your instances of FanStruct

<?php

class FanStruct{
    public $date;
    public $userid;

    function __construct($date, $id){
        $this->date = $date;
        $this->userid = $id;
    }

    public function __toString()
    {
      return $this->date . $this->userid;
    }
}

$test = array(
  new FanStruct( 'today', 1 )
  ,new FanStruct( 'today', 1 )
  ,new FanStruct( 'tomorrow', 1 )
);

print_r( array_unique( $test ) );

?>

edited Mar 15, 2021 at 8:54

Tiago Peres

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answered Jun 26, 2009 at 19:14

Peter Bailey

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1 Comment

Ja͢ck Over a year ago

Since 5.2.9 you don't need the __toString() anymore, it will work based on (object)$x == (object)$y comparisons when you use SORT_REGULAR.

cgp · Accepted Answer · 2009-06-26 19:11:26Z

1

$temp = array($fans[$x]);
for(var $x=1;$x<sizeof($fans);$x++) {
  if ($fans[$x]->userid != $fans[$x]->userid)
     $temp[] = $fans[$x];
}

Requires a temporary variable, but works.

answered Jun 26, 2009 at 19:11

cgp

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