PHP: Detailed explanation of usage differences of unset and array_splice with examples

Deleting array elements in php is very simple, but sometimes deleting an array requires some sorting of the index. We will use the relevant functions , here we will introduce the difference between using unset,array_spliceDelete elements in an array

If you want to delete an element in an array, you can directly Use unset, but the index of the array will not be rearranged:

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

The result is:

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

##So how can the missing elements be filled and the array re-indexed? Woolen cloth? The answer is array_splice():

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

The result is:

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

Delete specific elements 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);
?>

Supplementary deletion of empty array

Example:

<?php  
$array = (&#39;a&#39; => "abc", &#39;b&#39; => "bcd",&#39;c&#39; =>"cde",&#39;d&#39; =>"def",&#39;e&#39;=>"");  
array_filter($array);  
echo "<pre class="brush:php;toolbar:false">";  
print_r($array);
?>

Result:

Array (

[a] => abc

[b] => bcd

## [c] => cde

[d] => def

)

Summary

If the array_splice() function is deleted, the index value of the array will also change.

If the unset() function is deleted, the index value of the array will not change.

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