note 52048 deleted from function.array-merge by levim
| From: | levim@php.net | Date: | Mon, 24 Feb 2014 22:53:35 +0000 |
| Subject: | note 52048 deleted from function.array-merge by levim | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-198677@lists.php.net to get a copy of this message | ||
Note Submitter: rafmavCHEZlibre_in_france
----
Here are a few functions to make a diff between two arrays (or 2 strings, see the example) and merge
it back after
<?
function array_diff_both($new,$old)
{
$del=array_diff_assoc($old,$new);
$add=array_diff_assoc($new,$old);
return $diff=array("del"=>$del, "add"=>$add);
}
function array_diff_all($arr_new,$arr_old)
{
$arr_equ=array_intersect_assoc($arr_new,$arr_old);
$arr_del=array_diff_assoc($arr_old,$arr_new);
$arr_add=array_diff_assoc($arr_new,$arr_old);
return $diff=array("equ"=>$arr_equ, "del"=>$arr_del,
"add"=>$arr_add);
}
function array_merge_diff($arr,$diff) {
$arr=array_merge_replace($arr,$diff["del"]);
$arr=array_merge_replace($arr,$diff["add"]);
return $arr;
}
function array_merge_diff_reverse($arr,$diff) {
$arr=array_merge_replace($arr,$diff["add"]);
$arr=array_merge_replace($arr,$diff["del"]);
return $arr;
}
?>
Here is an example:
<?
//calculationg
$new="hello!"; // new string
$old="hrllo!"; // old string with a typo fault
// cast string in array the goodway
// make a cast (array) to a string does not work:
// the entire string is thus considered as one element
// of the array !!
$a_new=str_split($new);
$a_old=str_split($old); // cast string in array
$diff=array_diff_both($a_new,$a_old); // the entire diff
$test=array_merge_diff($a_old,$diff);
$test_reverse=array_merge_diff_reverse($a_new,$diff);
//for output the sample
print "new= $new<br/>old= $old<br/>\$a_new= ";
print_r($a_new);
print "<br/>\$a_old= ";
print_r($a_old);
print "<br/>\$diff=\$a_new-\$a_old";
print "<br/>\$diff= ";
print_r($diff);
print "<br/>\$test=\$a_old+\$diff";
print "<br/>\$test= ";
print_r($test);
print("<br/>".implode($test));
print "<br/>\$test_reverse=\$a_new+\$diff";
print "<br/>\$test_reverse= ";
print_r($test_reverse);
print("<br/>".implode($test_reverse));
?>
En sortie de l'exemple, résultats:
new= hello!
old= hrllo!
$a_new= Array ( [0] => h [1] => e [2] => l [3] => l [4] => o [5] => ! )
$a_old= Array ( [0] => h [1] => r [2] => l [3] => l [4] => o [5] => ! )
$diff=$a_new-$a_old
$diff= Array ( [del] => Array ( [1] => r ) [add] => Array ( [1] => e ) )
$test=$a_old+$diff
$test= Array ( [0] => h [1] => e [2] => l [3] => l [4] => o [5] => ! )
hello!
$test_reverse=$a_new+$diff
$test_reverse= Array ( [0] => h [1] => r [2] => l [3] => l [4] => o [5] => ! )
hrllo!
autre exemple, autre résultat:
new= see you!
old= sea ya!
$a_new= Array ( [0] => s [1] => e [2] => e [3] => [4] => y [5] => o [6] => u
[7] => ! )
$a_old= Array ( [0] => s [1] => e [2] => a [3] => [4] => y [5] => a [6] => ! )
$diff=$a_new-$a_old
$diff= Array ( [del] => Array ( [2] => a [5] => a [6] => ! ) [add] => Array ( [2]
=> e [5] => o [6] => u [7] => ! ) )
$test=$a_old+$diff
$test= Array ( [0] => s [1] => e [2] => e [3] => [4] => y [5] => o [6] => u [7]
=> ! )
see you!
$test_reverse=$a_new+$diff
$test_reverse= Array ( [0] => s [1] => e [2] => a [3] => [4] => y [5] => a [6]
=> ! [7] => ! )
sea ya!!