How to find a value in array and remove it by using PHP array functions

<?php
$my_array = array('sheldon', 'leonard', 'howard', 'penny');
$to_remove = array('howard');
$result = array_diff($my_array, $to_remove);
?>

You need to find the key of the array first, this can be done using array_search()

Once done, use the unset()

<?php
$array = array( 'apple', 'orange', 'pear' );

unset( $array[array_search( 'orange', $array )] );
?>

Just in case you want to use any of mentioned codes, be aware that array_search returns FALSE when the "needle" is not found in "haystack" and therefore these samples would unset the first (zero-indexed) item. Use this instead:

<?php
$haystack = Array('one', 'two', 'three');
if (($key = array_search('four', $haystack)) !== FALSE) {
  unset($haystack[$key]);
}
var_dump($haystack);

The above example will output:

Array
(
    [0] => one
    [1] => two
    [2] => three
)

And that's good!

This solution is the combination of @Peter's solution for deleting multiple occurences and @chyno solution for removing first occurence. That's is what I#m using.

/**
 * @param array $haystack
 * @param mixed $value
 * @param bool $only_first
 * @return array
 */
function array_remove_values(array $haystack, $needle = null, $only_first = false)
{
    if (!is_bool($only_first)) { throw new Exception("The parameter 'only_first' must have type boolean."); }
    if (empty($haystack)) { return $haystack; }

    if ($only_first) { // remove the first found value
        if (($pos = array_search($needle, $haystack)) !== false) {
            unset($haystack[$pos]);
        }
    } else { // remove all occurences of 'needle'
        $haystack = array_diff($haystack, array($needle));
    }

    return $haystack;
}

Also have a look here: PHP array delete by value (not key)

First of all, as others mentioned, you will be using the "array_search()" & the "unset()" methodsas shown below:-

<?php
$arrayDummy = array( 'aaaa', 'bbbb', 'cccc', 'dddd', 'eeee', 'ffff', 'gggg' );
unset( $arrayDummy[array_search( 'dddd', $arrayDummy )] ); // Index 3 is getting unset here.
print_r( $arrayDummy ); // This will show the indexes as 0, 1, 2, 4, 5, 6.
?>

Now to re-index the same array, without sorting any of the array values, you will need to use the "array_values()" method as shown below:-

<?php
$arrayDummy = array_values( $arrayDummy );
print_r( $arrayDummy ); // Now, you will see the indexes as 0, 1, 2, 3, 4, 5.
?>

Hope it helps.

To find and remove multiple instance of value in an array, i have used the below code

$list = array(1,3,4,1,3,1,5,8);

$new_arr=array();

foreach($list as $value){

    if($value=='1')
    {
        continue;
    }
    else
    {
        $new_arr[]=$value;
    }     
}


print_r($new_arr);