PHP merge two 1D arrays

The content of this article is about merging two one-dimensional arrays in PHP. Now I share it with you. Friends in need can refer to it

<?php
 $array1  = array( 0  =>  &#39;zero_a&#39; ,  2  =>  &#39;two_a&#39; ,  3  =>  &#39;three_a&#39; ); 
 $array2  = array( 1  =>  &#39;one_b&#39; ,  3  =>  &#39;three_b&#39; ,  4  =>  &#39;four_b&#39; ); 
 $result  =  $array1  +  $array2 ;
 var_dump ( $result ); ?>

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