Remove Values from PHP Array if Present

Question

I have the following PHP array:

Array
(
    [0] => 750
    [1] => 563
    [2] => 605
    [3] => 598
    [4] => 593
)

I need to perform the following action on the array using PHP:

Search the array for a value (the value will be in a variable; let's call it $number). If the value is present in the array, remove it.

If someone could walk me through how to do that, it would be much appreciated.

Note: If it makes it any easier, I can form the array so the keys are the same as the values.

For the god sake - read the documentation ru2.php.net/manual/en/ref.array.php — zerkms
– zerkms, Commented Sep 19, 2011 at 4:51
These are 3 completely separate questions. Look at Finding Min and Max questions for number 3. — styfle
– styfle, Commented Sep 19, 2011 at 4:54
OK, I've managed to find the min and max, and remove duplicates, but how do I remove a specific value if it exists? I'll edit the question to house only this. — stefmikhail
– stefmikhail, Commented Sep 19, 2011 at 4:56

genesis · Accepted Answer · 2011-09-19 05:27:49Z

2

$array = array_unique($array) // removes dupicate values


while(false !== ($num = array_search($num, $array))){
    unset($array[$num]);
}
$max = max($array);

will search for all keys with value $num and unset them

edited Sep 19, 2011 at 5:27

answered Sep 19, 2011 at 5:00

genesis

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7 Comments

styfle Over a year ago

The while loop should check specifically for !== false because if the first element (index 0) is found, your code will not unset the element.

stefmikhail Over a year ago

@genesis φ - Thanks for the answer. How do you feel while compares with Josh Randall's method of unsetting the key?

genesis Over a year ago

@stefmikhail: his one is little bit complicated and harder.

stefmikhail Over a year ago

@genesis φ - Don't know if you saw my original question, but it was to explain how to remove duplicates as well as place the maximum value in a variable. How do you feel about Josh Randall's answer concerning those?

genesis Over a year ago

@stefmikhail: no, second step is wrong. I'll add it into my answer

|

Josh Randall · Accepted Answer · 2011-09-19 05:00:22Z

2

lets say your $array

$array = array_unique($array) // removes dupicate values

$array = arsort($array) 

$variable = $array[0]  //  the maximum value in the array, and place it in a variable.  

$key = array_search($array, $number);

if($key){

    unset($array[$key])  // Search array for a value, value is present in array, remove it.

}

answered Sep 19, 2011 at 5:00

Josh Randall

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Comments

mickmackusa · Accepted Answer · 2017-11-27 03:25:30Z

array_search() and unset() seems a good method for your sample data in your question. I'll just show a different way for comparison's sake (or in case your use case is slightly different from what you have posted here).

Methods: (Demo)

$array=[750,563,605,598,593];

// if removing just one number apply the number as an array element
$number=605;
var_export(array_diff($array,[$number]));

// if you are performing this task with more than one $number, make $numbers=array() and do the same...
$numbers=[605,563];  // order doesn't matter
var_export(array_diff($array,$numbers));

// if you need to re-index the output array, use array_values()...
$numbers=[605,563];  // order doesn't matter
var_export(array_values(array_diff($array,$numbers)));

Output:

array (
  0 => 750,
  1 => 563,
  3 => 598,
  4 => 593,
)

array (
  0 => 750,
  3 => 598,
  4 => 593,
)

array (
  0 => 750,
  1 => 598,
  2 => 593,
)

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