How to remove a certain field from a php array

In PHP development, array is a data structure often used by developers. It is a very flexible data type that can store various types of data, including numbers, strings, Boolean values, etc. When developers need to operate on a field in an array, they usually use the index or key name of the array to access the field. But sometimes, we need to delete a field from the array. What should we do at this time? This article will introduce how to remove a field from an array in PHP.

1. Use the unset function

In PHP, you can use the unset function to delete a field in the array. The syntax of the unset function is as follows:

unset($array['key']);

Among them, $array is the array to be deleted, and 'key' is the index or key name of the field that needs to be deleted.

The following is a sample code:

<?php
// 定义一个关联数组
$person = array(
    &#39;name&#39; => 'Tom', 
    'age' => '24', 
    'gender' => 'male'
);

// 删除gender字段
unset($person['gender']);

// 输出删除gender字段后的数组
print_r($person);
?>

After executing the above code, the output result is as follows:

Array
(
    [name] => Tom
    [age] => 24
)

As you can see, the gender field has been deleted from the array.

2. Use the array_diff_key function

In addition to using the unset function, you can also use the array_diff_key function to delete a field in the array. The syntax of the array_diff_key function is as follows:

array_diff_key($array1, array_flip($keys));

Among them, $array1 is the array of fields to be deleted, and $keys is the index or key name of the field to be deleted.

The following is a sample code:

<?php
// 定义一个关联数组
$person = array(
    &#39;name&#39; => 'Tom', 
    'age' => '24', 
    'gender' => 'male'
);

// 删除gender字段
$keys = ['gender'];
$person = array_diff_key($person, array_flip($keys));

// 输出删除gender字段后的数组
print_r($person);
?>

After executing the above code, the output result is consistent with the output result of the above sample code.

3. Use the array_filter function

In addition to the above two methods, you can also use the array_filter function to delete a field in the array. The syntax of the array_filter function is as follows:

array_filter($array, function($key) use ($field) {
    return $key !== $field;
}, ARRAY_FILTER_USE_KEY);

Among them, $array is the array of fields to be deleted, and $field is the index or key name of the field to be deleted.

The following is a sample code:

<?php
// 定义一个关联数组
$person = array(
    &#39;name&#39; => 'Tom', 
    'age' => '24', 
    'gender' => 'male'
);

// 删除gender字段
$field = 'gender';
$person = array_filter($person, function($key) use ($field) {
    return $key !== $field;
}, ARRAY_FILTER_USE_KEY);

// 输出删除gender字段后的数组
print_r($person);
?>

After executing the above code, the output result is consistent with the output result of the above sample code.

Summary

This article introduces three methods to remove a field in an array in PHP, using the unset function, array_diff_key function and array_filter function. Developers can choose the appropriate method according to their actual needs.

Removing a field from an array is a common operation in PHP development. It is very important for developers to master the method of this operation. Hope this article can be helpful to everyone.

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