How to add a field to an array in php

How to add a field to an array in php: 1. Define an array in the form of key-value pairs; 2. Add a field directly through "$array_test['new_test'] = $new_test;" .

The operating environment of this article: Windows 7 system, PHP version 7.4, DELL G3 computer

How to add a field to an array in php ?

PHP adds a new field to the array to store an array

As someone who likes to be lazy, it is easiest to find a function that comes with PHP Yes, but I found that there are many methods, but there are also many pitfalls. First define an array and what needs to be added for everyone to see.

// 定义一个键值对形式的数组。
$array_test = array(
'a' => "aa",
'b' => "bb",
);
// 再定义一个需要加进去的键值对，这个键值对也放在数组中，也就是新增一个字段'new_test'=>$new_test
$new_test = array(
'c' => "cc",
'd' => "dd",
);

For example: array_push($array_test ,array('new_test' => $new_test)), although it can also be spliced, but you will find out why the newly added key-value pairs are in the original The data later becomes '0'=>array(2); instead of adding a new field 'new_test'=>$new_test.

This is the problem with array_push(), and according to what is said on the Internet:

1. Even if there are string key names in the array, the elements you add are always numeric keys.

2. If you use array_push() to add a unit to the array, it is better to use $array[] =, because there is no additional burden of calling the function.

Note: array_merge() cannot be used because this function splices two strings, rather than adding another array to the specified array with a new field.

So what should we do?

It’s super simple, so simple that I want to take out my brain to see if I’m stupid or stupid!

Just $array_test['new_test'] = $new_test; is enough. Isn’t it super simple? Woohoo, let’s take a look at what the array will look like after this step:

$array_test = array(
'a' => "aa",
'b' => "bb",
'new_test' => array(
'c' => "cc",
'd' => "dd",
)
);

Recommended learning: "PHP Video Tutorial"

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