Display array values not repeadly

Question

I have the following array

$ar = array ( 1,2,3,4,5,3,6,7,...)

i do a foreach to display elements like

$i = 0
foreach ($ar as $tab){

echo $tab[i];

$i++
}

I dont want to display twice the same value like 3. i just want 1 2 3 4 5 6 7...

Daniel Vandersluis · Accepted Answer · 2010-09-21 15:25:57Z

4

You can use array_unique to get the unique set of values from your array before iterating over it:

$arr = array(1,2,3,4,5,3,6,7);
foreach (array_unique($arr) as $tab)
{
  // ...
}

answered Sep 21, 2010 at 15:25

Daniel Vandersluis

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Nik · Accepted Answer · 2010-09-21 15:23:54Z

1

try array_unique

answered Sep 21, 2010 at 15:23

Nik

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Pedro Gil · Accepted Answer · 2010-09-21 15:37:28Z

0

You may use flip-flip-merge technique which is faster than array_unique()

$ar = array(1,2,3,4,5,3,6,7);
$ar = array_merge(array_flip(array_flip($ar)));

You may read about it here http://thebatesreport.com/blog/?p=9

answered Sep 21, 2010 at 15:37

Pedro Gil

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5 Comments

Daniel Vandersluis Over a year ago

That article is more than 4 years old.

Pedro Gil Over a year ago

and? I tested it with PHP 5.3 Results >>> 0.0122 (flip-flip-merge) 0.514 (array_unique)

Wrikken Over a year ago

linux 2.6.32-5-686-bigmem, php 5.3.2: 0m19.412s (flipper) vs. 0m19.123s (unique) (a few thousand iterations of course)

Wrikken Over a year ago

It does seem terribly dependent on the actual data, whether there are doubles, etc.

Mamadou Over a year ago

thank you guys, your solution ( array_unique) does the job. But my array is more complex than the exemple i gave. Am going to see how to adapt !

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