How to remove specified values ​​from an array in php (three methods)

In the development process of PHP, we often use arrays. Array is a very commonly used data type, which can be used to store multiple data and can also quickly operate on this data. However, in actual development, sometimes we need to remove some specific elements in the array. This article will introduce how to use PHP to remove specific elements from an array.

1. Use the unset function to remove specified elements from the array

The unset function in PHP can be used to delete an array element. We can find the element that needs to be deleted by traversing the entire array and delete it using the unset function. The following is a sample code:

<?php
$array = array(&#39;hello&#39;, &#39;world&#39;, &#39;php&#39;, &#39;language&#39;, &#39;programming&#39;);
$remove = &#39;php&#39;;

foreach ($array as $key => $value) {
    if ($value == $remove) {
        unset($array[$key]);
    }
}

print_r($array);
?>

This code will output elements other than elements with a value of 'php'. We can see that using the unset function can quickly and efficiently delete the specified element in the array.

2. Use the array_filter function to remove specified elements from the array

The array_filter function in PHP can filter the array and return elements that meet the conditions. We can pass in a callback function to determine whether each element meets the filtering conditions. The following is a sample code:

<?php
$array = array(&#39;hello&#39;, &#39;world&#39;, &#39;php&#39;, &#39;language&#39;, &#39;programming&#39;);
$remove = &#39;php&#39;;

$array = array_filter($array, function($value) use ($remove) {
    return $value != $remove;
});

print_r($array);
?>

This code will output elements other than elements with a value of 'php'. We can see that using the array_filter function can quickly obtain elements that meet the conditions without traversing the entire array.

3. Use the array_diff function to remove specified elements in the array

The array_diff function in PHP can compare multiple arrays and return different elements. We can put the elements that need to be removed into an array, and then compare it with the original array to get an array that does not contain the specified elements. The following is a sample code:

<?php
$array = array(&#39;hello&#39;, &#39;world&#39;, &#39;php&#39;, &#39;language&#39;, &#39;programming&#39;);
$remove = array(&#39;php&#39;);

$array = array_diff($array, $remove);

print_r($array);
?>

This code will output elements other than elements with a value of 'php'. We can see that using the array_diff function can quickly get an array that does not contain the specified elements.

To sum up, we can use the unset function, array_filter function or array_diff function to remove specified elements in the array. Different methods have different usage scenarios, and we can choose which method to use based on actual needs. Hope this article is helpful to you.

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