Differences between array merge and + in PHP

Introduction: This is a detailed page of the difference between array merge and + of PHP. It introduces related knowledge, skills, experience, and some PHP source code.

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PHP's array_merge will convert the value to 0, 1, 2..., even if it is forcibly converted to a string.

Example-use array_merge


<? PHP
$ A1 = array (
'9' => '0 ',
'20140901' => '1 ',
'Happy '=> '2 ',
'2009a' => '3 ');

$ A2 = array (
'20140901' => '11 ',
'Christmas '=> '22 ',
'111a '=> '33 ');

$ Amerge = array ();


$ Amerge = array_merge ($ A1, $ A2 );

Print_r ($ amerge );
?>


Output result

Array
(
[0] => 0
[1] => 1
[Happy] => 2
[2009a] => 3
[2] => 11
[Christmas] => 22
[111a] => 33
)

On the official website (array_merge
),You can use "+" to merge and retain the key (hash, index) value.

Example-use + merge


<? PHP
$ A1 = array (
'9' => '0 ',
'20140901' => '1 ',
'Happy '=> '2 ',
'2009a' => '3'
);

$ A2 = array (
'20140901' => '11 ',
'Christmas '=> '22 ',
'111a '=> '33'
);

$ Amerge = array ();


$ Amerge = $ A1 + $ A2;

Print_r ($ amerge );
?>


Output result

Array
(
[9] => 0
[311] => 1
[Happy] => 2
[2009a] => 3
[1, 2009] => 11
[Christmas] => 22
[111a] => 33
)

Original website/reposted from:
Tsung Hao

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.

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