How to dynamically add an array in php

Dynamic addition of arrays is a very common operation in PHP. Dynamically adding arrays when writing code allows us to process data more flexibly.

Generally speaking, we can dynamically add PHP arrays through the following methods:

1. Use array subscripts to dynamically add array elements

Use array subscripts Marking is the most basic method of adding an array, and it can easily add a new array element. For example:

$my_array = array();
$my_array[0] = 'apple';
$my_array[1] = 'banana';
$my_array[2] = 'orange';

This creates a $my_array containing three array elements.

2. Use the array_push() function

The array_push() function can add one or more values ​​to the end of the array, for example:

$my_array = array('apple', 'banana', 'orange');
array_push($my_array, 'pear');

By With the array_push() function, we dynamically add an element to the end of the $my_array array.

3. Use the [] operator

After PHP5.4, we can use the [] operator to dynamically add array elements, for example:

$my_array = array('apple', 'banana', 'orange');
$my_array[] = 'pear';

This achieves dynamic addition to the array.

4. Use array_merge() function

array_merge() function can merge multiple arrays into one array and return a new array, for example:

$array1 = array('apple', 'banana');
$array2 = array('pear', 'orange');
$my_array = array_merge($array1, $array2);

This creates a new array $my_array, which contains all elements in array1 and array2.

Summary:

The above methods are very common and simple ways to dynamically add arrays in PHP. Of course, in addition to this, there are other more advanced methods, but these methods are usually used in specific scenarios. Understanding these basic methods is an essential skill for writing PHP code.

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