php function to merge arrays

PHP array_merge() function

##Definition and usage

The array_merge() function merges one or more arrays into one array.

Tip: You can input one or more arrays to the function. (Recommended learning:

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Note: If two or more array elements have the same key name, the last element will cover other elements.

Note: If you only input an array to the array_merge() function, and the key names are integers, the function will return a new array with integer key names whose keys start with 0 starts reindexing.

Tip: The difference between this function and the array_merge_recursive() function is that it handles the case where two or more array elements have the same key name. array_merge_recursive() does not perform key name overwriting, but recursively combines multiple values ​​with the same key name into an array.

Syntax

array_merge(array1,array2,array3...)

array1, required. Specifies an array. array2, optional. Specifies an array. array3, optional. Specifies an array.      

Example

Combine two arrays into one array:

<?php
$a1=array("red","green");
$a2=array("blue","yellow");
print_r(array_merge($a1,$a2));
?>

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