Revisions to Deleting an element from an array in PHP

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edited Feb 19, 2019 at 10:52

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134

  // ourOur initial array  
   $arr = array("blue", "green", "red", "yellow", "green", "orange", "yellow", "indigo", "red");  
  print_r($arr);

  // removeRemove the elements who's values are yellow or red  
   $arr = array_diff($arr, array("yellow", "red"));
  print_r($arr);

This is the output from the code above:

Array
(
    [0] => blue
    [1] => green
    [2] => red
    [3] => yellow
    [4] => green
    [5] => orange
    [6] => yellow
    [7] => indigo
    [8] => red
)

Array
(
    [0] => blue
    [1] => green
    [4] => green
    [5] => orange
    [7] => indigo
)

Now, array_values() will reindex a numerical array nicely, but it will remove all key strings from the array and replace them with numbers. If you need to preserve the key names (strings), or reindex the array if all keys are numerical, use array_merge():

$arr = array_merge(array_diff($arr, array("yellow", "red")));
print_r($arr);

outputsOutputs

Array
(
    [0] => blue
    [1] => green
    [2] => green
    [3] => orange
    [4] => indigo
)

  // our initial array  
   $arr = array("blue", "green", "red", "yellow", "green", "orange", "yellow", "indigo", "red");  
  print_r($arr);

  // remove the elements who's values are yellow or red  
   $arr = array_diff($arr, array("yellow", "red"));
  print_r($arr);

This is the output from the code above:

Array
(
    [0] => blue
    [1] => green
    [2] => red
    [3] => yellow
    [4] => green
    [5] => orange
    [6] => yellow
    [7] => indigo
    [8] => red
)

Array
(
    [0] => blue
    [1] => green
    [4] => green
    [5] => orange
    [7] => indigo
)

Now, array_values() will reindex a numerical array nicely, but will remove all key strings from the array and replace them with numbers. If you need to preserve the key names (strings), or reindex the array if all keys are numerical, use array_merge():

$arr = array_merge(array_diff($arr, array("yellow", "red")));
print_r($arr);

outputs

Array
(
    [0] => blue
    [1] => green
    [2] => green
    [3] => orange
    [4] => indigo
)

  // Our initial array
  $arr = array("blue", "green", "red", "yellow", "green", "orange", "yellow", "indigo", "red");
  print_r($arr);

  // Remove the elements who's values are yellow or red
  $arr = array_diff($arr, array("yellow", "red"));
  print_r($arr);

This is the output from the code above:

Array
(
    [0] => blue
    [1] => green
    [2] => red
    [3] => yellow
    [4] => green
    [5] => orange
    [6] => yellow
    [7] => indigo
    [8] => red
)

Array
(
    [0] => blue
    [1] => green
    [4] => green
    [5] => orange
    [7] => indigo
)

Now, array_values() will reindex a numerical array nicely, but it will remove all key strings from the array and replace them with numbers. If you need to preserve the key names (strings), or reindex the array if all keys are numerical, use array_merge():

$arr = array_merge(array_diff($arr, array("yellow", "red")));
print_r($arr);

Outputs

Array
(
    [0] => blue
    [1] => green
    [2] => green
    [3] => orange
    [4] => indigo
)

format output for readability

Source Link

edited Sep 19, 2015 at 19:12

Abdullah Jibaly

55.1k
45
129
201

  // our initial array  
   $arr = array("blue", "green", "red", "yellow", "green", "orange", "yellow", "indigo", "red");  
  print_r($arr);

  // remove the elements who's values are yellow or red  
   $arr = array_diff($arr, array("yellow", "red"));
  print_r($arr);

This is the output from the code above:

Array ( [0] => blue [1] => green [2] => red [3] => yellow [4] => green [5] => orange [6] => yellow [7] => indigo [8] => red )
Array ( [0] => blue [1] => green [4] => green [5] => orange [7] => indigo )

Array
(
    [0] => blue
    [1] => green
    [2] => red
    [3] => yellow
    [4] => green
    [5] => orange
    [6] => yellow
    [7] => indigo
    [8] => red
)

Array
(
    [0] => blue
    [1] => green
    [4] => green
    [5] => orange
    [7] => indigo
)

Now, array_values() will reindex a numerical array nicely, but will remove all key strings from the array and replace them with numbers. If you need to preserve the key names (strings), or reindex the array if all keys are numerical, use array_merge():

$arr = array_merge(array_diff($arr, array("yellow", "red")));
print_r($arr);

outputs

Array ( [0] => blue [1] => green [2] => green [3] => orange [4] => indigo )

Array
(
    [0] => blue
    [1] => green
    [2] => green
    [3] => orange
    [4] => indigo
)

  // our initial array  
   $arr = array("blue", "green", "red", "yellow", "green", "orange", "yellow", "indigo", "red");  
  print_r($arr);

  // remove the elements who's values are yellow or red  
   $arr = array_diff($arr, array("yellow", "red"));
  print_r($arr);

This is the output from the code above:

Array ( [0] => blue [1] => green [2] => red [3] => yellow [4] => green [5] => orange [6] => yellow [7] => indigo [8] => red )
Array ( [0] => blue [1] => green [4] => green [5] => orange [7] => indigo )

Now, array_values() will reindex a numerical array nicely, but will remove all key strings from the array and replace them with numbers. If you need to preserve the key names (strings), or reindex the array if all keys are numerical, use array_merge():

$arr = array_merge(array_diff($arr, array("yellow", "red")));
print_r($arr);

outputs

Array ( [0] => blue [1] => green [2] => green [3] => orange [4] => indigo )

  // our initial array  
   $arr = array("blue", "green", "red", "yellow", "green", "orange", "yellow", "indigo", "red");  
  print_r($arr);

  // remove the elements who's values are yellow or red  
   $arr = array_diff($arr, array("yellow", "red"));
  print_r($arr);

This is the output from the code above:

Array
(
    [0] => blue
    [1] => green
    [2] => red
    [3] => yellow
    [4] => green
    [5] => orange
    [6] => yellow
    [7] => indigo
    [8] => red
)

Array
(
    [0] => blue
    [1] => green
    [4] => green
    [5] => orange
    [7] => indigo
)

Now, array_values() will reindex a numerical array nicely, but will remove all key strings from the array and replace them with numbers. If you need to preserve the key names (strings), or reindex the array if all keys are numerical, use array_merge():

$arr = array_merge(array_diff($arr, array("yellow", "red")));
print_r($arr);

outputs

Array
(
    [0] => blue
    [1] => green
    [2] => green
    [3] => orange
    [4] => indigo
)

deleted 2 characters in body

Source Link

edited Feb 10, 2012 at 17:17

Marcel Cozma

4.5k
1
20
17

  // our initial array  
   $arr = array("blue", "green", "red", "yellow", "green", "orange", "yellow", "indigo", "red");  
  print_r($arr);

  // remove the elements who's values are yellow or red  
   $arr = array_diff($arr, array("yellow", "red"));
  print_r($arr);

This is the output from the code above:

Array ( [0] => blue [1] => green [2] => red [3] => yellow [4] => green [5] [5] => orange [6] => yellow [7] => indigo [8] => red ) Array
Array ( [0] => => blue [1] => green [4] => green [5] => orange [7] => indigo )

Now, array_values() will reindex a numerical array nicely, but will remove all key strings from the array and replace them with numbers. If you need to preserve the key names (strings), or reindex the array if all keys are numerical, use array_merge():

$arr = array_merge(array_diff($arr, array("yellow", "red")));
print_r($arr);

outputs

Array ( [0] => blue [1] => green [2] => green [3] => orange [4] => indigo )

  // our initial array  
   $arr = array("blue", "green", "red", "yellow", "green", "orange", "yellow", "indigo", "red");  
  print_r($arr);

  // remove the elements who's values are yellow or red  
   $arr = array_diff($arr, array("yellow", "red"));
  print_r($arr);

This is the output from the code above:

Array ( [0] => blue [1] => green [2] => red [3] => yellow [4] => green [5] => orange [6] => yellow [7] => indigo [8] => red ) Array ( [0] => blue [1] => green [4] => green [5] => orange [7] => indigo )

Now, array_values() will reindex a numerical array nicely, but will remove all key strings from the array and replace them with numbers. If you need to preserve the key names (strings), or reindex the array if all keys are numerical, use array_merge():

$arr = array_merge(array_diff($arr, array("yellow", "red")));
print_r($arr);

outputs

Array ( [0] => blue [1] => green [2] => green [3] => orange [4] => indigo )

  // our initial array  
   $arr = array("blue", "green", "red", "yellow", "green", "orange", "yellow", "indigo", "red");  
  print_r($arr);

  // remove the elements who's values are yellow or red  
   $arr = array_diff($arr, array("yellow", "red"));
  print_r($arr);

This is the output from the code above:

Array ( [0] => blue [1] => green [2] => red [3] => yellow [4] => green [5] => orange [6] => yellow [7] => indigo [8] => red )
Array ( [0] => blue [1] => green [4] => green [5] => orange [7] => indigo )

Now, array_values() will reindex a numerical array nicely, but will remove all key strings from the array and replace them with numbers. If you need to preserve the key names (strings), or reindex the array if all keys are numerical, use array_merge():

$arr = array_merge(array_diff($arr, array("yellow", "red")));
print_r($arr);

outputs

Array ( [0] => blue [1] => green [2] => green [3] => orange [4] => indigo )

output display

Source Link

edit approved Nov 29, 2011 at 10:28

ArK

21.1k
67
113
136

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Source Link

answered Aug 2, 2011 at 15:57

Marcel Cozma

4.5k
1
20
17

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