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PHP Quiz PHP CertificatePHP array_merge() Function
Complete PHP Array Reference
Definition and Usage
The array_merge() function merges one or more arrays into one array.
Syntax
array_merge(array1,array2,array3...)
| Parameter | Description |
|---|---|
| array1 | Required. Specifies an array |
| array2 | Optional. Specifies an array |
| array3 | Optional. Specifies an array |
Tips and Notes
Tip: You can assign one array to the function, or as many as you like.
Note: If two or more array elements have the same key, the last one overrides the others.
Note: If you assign only one array to the array_merge() function, and the keys are integers, the function returns a new array with integer keys starting at 0 and increases by 1 for each value. (See example 2)
Example 1
<?php
$a1=array("a"=>"Horse","b"=>"Dog");
$a2=array("c"=>"Cow","b"=>"Cat");
print_r(array_merge($a1,$a2));
?>
$a1=array("a"=>"Horse","b"=>"Dog");
$a2=array("c"=>"Cow","b"=>"Cat");
print_r(array_merge($a1,$a2));
?>
The output of the code above will be:
Array ( [a] => Horse [b] => Cat [c] => Cow )
Example 2
Using only one array parameter.
<?php
$a=array(3=>"Horse",4=>"Dog");
print_r(array_merge($a));
?>
$a=array(3=>"Horse",4=>"Dog");
print_r(array_merge($a));
?>
The output of the code above will be:
Array ( [0] => Horse [1] => Dog )
Complete PHP Array Reference
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