How to distinguish the difference between unset and array_splice in PHP

1. Function used

a. Function unset()

unset ( mixed $var , mixed $... = ? ) : void

          unset() Destroy the specified variable.

b. Functionarray_slice()

  array_splice(array,start,length,array)

• Array represents an array.

• start indicates the starting position of deleted elements.

• length represents the number of elements removed and is also the length of the returned array. (Optional)

• array represents an array with elements to be inserted into the original array (Optional)

2. Example:

Use unset() to delete an element in the array

<?php  
    $arr = array(&#39;a&#39;,&#39;b&#39;,&#39;c&#39;,&#39;d&#39;); 
    unset($arr[1]); 
    print_r($arr); 
?>

Output:

Array 
( 
            [0] => a 
            [2] => c 
            [3] => d 
)

​ Use array_splice()Delete an element in the array

<?php 
$arr2 = array(1,3, 5,7,8); 
    foreach ($arr2 as $key=>$value) 
    {      
     if ($value === 3)     
     unset($arr2[$key]); 
     } 
var_dump($arr2);
?>

​​ Output:

Array
(
    [0] => a
    [1] => c
    [2] => d
)

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