How to use array_merge() function in php? (code example)

array_merge() is a built-in function in PHP, which can merge the elements or values ​​of two or more arrays into one array, and then return this array. Below we will introduce the usage of array_merge() function in detail, hoping it will be helpful to everyone.

array_merge() function

array_merge() function separated by commas (', ') The array list is used as the parameter that needs to be merged, and then the value of the latter array is appended to the end of the previous array to form a new array and returned. This array contains the merged value of the array passed in the parameter.

Note: We can pass any number of arrays in the parameters.

Basic syntax:

array array_merge($array1, $array2, ......, $arrayn)

Usage of array_merge() function

Below we use a simple An example is provided to introduce the working principle of the array_merge() function, so that everyone can understand how to use the array_merge() function.

Example 1: Passing parameters using integer keys

If parameters are passed to the array_merge() function, and the keys of this array parameter are integers, then the output in the array The keys will be renumbered starting from 0 and the value of the next element will be incremented by 1.

<?php 
$my_array = array(1 => "PHP", 3=>"Python", 2=>"Java"); 
  
$res = array_merge($my_array); 
echo "<pre class="brush:php;toolbar:false">";
print_r($res); 
echo "

Output:

Example 2: Merging two arrays using integer keys

<?php 
$my_array1 = array(0 => &#39;zero_a&#39;, 2 => &#39;two_a&#39;, 3 => &#39;three_a&#39;); 
$my_array2 = array(1 => &#39;one_b&#39;, 3 => &#39;three_b&#39;, 4 => &#39;four_b&#39;); 
$res = array_merge($my_array1,$my_array2);
echo "<pre class="brush:php;toolbar:false">";
print_r($res); 
echo "

Output:

Example 3: Comprehensive example

<?php 
$my_array1 = array("size" => "big", 2 =>2,3 ); 
$my_array2 = array(1 =>"a", "b", "size" => "medium", "shape" => "circle", 4); 
$res = array_merge($my_array1, $my_array2); 
echo "<pre class="brush:php;toolbar:false">";
print_r($res); 
echo "

Output:

Example description:

When there are two arrays passed as parameters to the array_merge() function, the value of the latter array will be appended to the end of the previous array. If two elements have the same string key, the latter value will overwrite the previous value; if there is an integer key, the numbering will start again from zero.

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