What is the php function to delete array values?

In the PHP language, there are many functions for deleting array values. The commonly used ones are unset(), array_splice() and array_filter().

1. unset() function
   The unset() function can delete the value of the specified key in the array.
   Syntax: unset(array $array_name, mixed $key);
   Example:

$arr = array("apple", "banana", "orange");
unset($arr[1]); //Delete the element "banana" with subscript 1
print_r($arr); //Output: Array ( [0] => apple [2] => orange )
?>

2. array_splice() function
   array_splice() function will delete the element at the specified position in the array and re-index the array. It can also insert new elements while removing elements.
   Syntax: array_splice(array &$input, int $offset [, int $length [, mixed $replacement]]);
   Example:

$arr = array("apple", "banana", "orange");
array_splice($arr, 1, 1); //Delete the element "banana" with index 1
print_r($arr ); //Output: Array ( [0] => apple [1] => orange )
?>

##array_filter() function
3. array_filter() function can Filter the elements in the array according to the specified conditions and return a new array, leaving the original array unchanged.
   Syntax: array_filter(array $array [, callable $callback [, int $flag = 0 ]]);
   Example:
   

return $val != "banana"; //过滤掉元素"banana"

print_r($new_arr) ; //Output: Array ( [0] => apple [2] => orange )
?>
These functions can be used flexibly according to specific needs to achieve the effect of deleting array values. . In actual development, in addition to these functions, there are many other methods that can even more efficiently implement the operation of deleting array values. Developers can choose the appropriate method according to their needs.

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