note 105968 added to function.array-merge
| From: | Krinkle at osu1 dot php dot net | Date: | Wed, 28 Sep 2011 22:01:50 +0000 |
| Subject: | note 105968 added to function.array-merge | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-183513@lists.php.net to get a copy of this message | ||
I always confuse which does what and when. So I made this cheatsheet that you may find useful.
The existing examples show some situations but not all of these four.
<?php
$n1 = array('foo', 'bar', 'baz');
$n2 = array('lorem', 'ipsum', 'foo');
// array plus:
// - duplicate numeral keys are ignored, not overwriting
// - new keys inserted at the end
$n1 + $n2;
?>
array(3) {
[0]=>
string(3) "foo"
[1]=>
string(3) "bar"
[2]=>
string(3) "baz"
}
<?php
// array_merge:
// - duplicate numeral keys are appended and keys are reindexed
// - new keys inserted at the end
array_merge( $n1, $n2 );
?>
array(6) {
[0]=>
string(3) "foo"
[1]=>
string(3) "bar"
[2]=>
string(3) "baz"
[3]=>
string(5) "lorem"
[4]=>
string(5) "ipsum"
[5]=>
string(3) "foo"
}
<?php
$a1 = array('f' => 'foo', 'b' => 'bar', 'q'
=> 'quux');
$a2 = array('l' => 'lorem', 'i' => 'ipsum',
'f' => 'facilisis');
// array plus:
// - duplicate associative array keys ignored, not overwriting
// - new keys inserted at the end
$a1 + $a2;
?>
array(5) {
["f"]=>
string(3) "foo"
["b"]=>
string(3) "bar"
["q"]=>
string(4) "quux"
["l"]=>
string(5) "lorem"
["i"]=>
string(5) "ipsum"
}
<?php
// array plus:
// - replacements are done at the original position
// - new keys inserted at the end
array_merge( $a1, $a2 )
?>
array(5) {
["f"]=>
string(9) "facilisis"
["b"]=>
string(3) "bar"
["q"]=>
string(4) "quux"
["l"]=>
string(5) "lorem"
["i"]=>
string(5) "ipsum"
}
----
Server IP: 69.147.83.197
Probable Submitter: 82.74.192.60
----
Manual Page -- http://www.php.net/manual/en/function.array-merge.php
Edit -- https://master.php.net/note/edit/105968
Del: integrated -- https://master.php.net/note/delete/105968/integrated
Del: useless -- https://master.php.net/note/delete/105968/useless
Del: bad code -- https://master.php.net/note/delete/105968/bad+code
Del: spam -- https://master.php.net/note/delete/105968/spam
Del: non-english -- https://master.php.net/note/delete/105968/non-english
Del: in docs -- https://master.php.net/note/delete/105968/in+docs
Del: other reasons-- https://master.php.net/note/delete/105968
Reject -- https://master.php.net/note/reject/105968
Search -- https://master.php.net/manage/user-notes.php