How can I delete array elements inside foreach loop?

Question

I have a foreach loop and I would like to completely remove the array elements that satisfy the criteria, and change the keys to stay sequential 1,2,3,4.

I have:

$thearray = array(20,1,15,12,3,6,93);
foreach($thearray as $key => $value){
    if($value < 10){
        unset($thearray[$key]);
    }
}
print_r($thearray);

But this keeps the keys as they were before. I want to make them 1,2,3,4, how can this be achieved?

This gives me: Array ( [0] => 20 [2] => 15 [3] => 12 [6] => 93 ) But I want the key to be 0,1,2,3 not 0,2,3,6... — David19801
– David19801, Commented Nov 2, 2012 at 16:47
Have you even tried to look that up in te php documentation, section Array functions? — dbf
– dbf, Commented Nov 2, 2012 at 16:48

nickb · Accepted Answer · 2012-11-02 16:48:30Z

5

Reset the array indices with array_values():

$thearray = array_values( $thearray);
print_r($thearray);

answered Nov 2, 2012 at 16:48

nickb

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Baba · Accepted Answer · 2012-11-02 16:52:27Z

1

You can just use array_filter to remove the array elements that satisfy the criteria

 $thisarray = array_filter($thearray,function($v){ return $v > 10 ;});

Then use array_values change the keys to stay 0, 1,2,3,4 .... as required

  $thisarray = array_values($thisarray);

edited Nov 2, 2012 at 16:52

answered Nov 2, 2012 at 16:46

Baba

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4 Comments

clentfort Over a year ago

array_filter will keep the old indices.

Baba Over a year ago

What version of PHP are you using ??

clentfort Over a year ago

Closures are supported from php version 5.3.0.

David19801 Over a year ago

I think I do not have that sorry. I have now solved it with your help guys using array_values. problem solved. Thank you all.

Landon · Accepted Answer · 2012-11-02 16:47:57Z

0

Build up a new array and then assign that to your original array after:

$thearray=array(20,1,15,12,3,6,93);
$newarray=array();
foreach($thearray as $key=>$value){
  if($value>=10){
    $newarray[]=$value
  }
}
$thearray=$newarray;
print_r($thearray);

answered Nov 2, 2012 at 16:47

Landon

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