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Gratulacje i dzięki! Trafiłem tu przypadkiem poszukując informacji na temat php+mysql. Wiele polskich stron powiela identyczne przykłady, klonuje te same kursy i lekcje... ten serwis okazał sie inny. Zasada "problem - rozwiazanie - wyjaśnienie" zdaje egzamin - zapewnia jasną, jednoznaczną i pewną pomoc w konkretnym przypadku. Porady są warte swojej ceny, przede wszystkim ze względu na przyjazną (także dla początkujących) formę i treść oraz bogate i stale powiększane zasoby. Polecam i pozdrawiam!
Kamil Dmowski
Polski Czerwony Krzyż
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uasort (PHP 3 >= 3.0.4, PHP 4, PHP 5) uasort --
Sortuj tablicę korzystając ze zdefiniowanej przez użytkownika funkcji
porównującej i zachowując skojarzenia kluczy
Opisvoid uasort ( array &tablica, callback funkcja )
Funkcja ta sortuje tablicę w taki sposób, że klucze zachowują przypisanie
do odpowiednich wartości. Jest to używane głównie przy sortowaniu tablic
asocjacyjnych, gdzie znacząca jest kolejność elementów. Funkcja
porównująca jest zdefiniowana przez użytkownika.
Zwraca TRUE w przypadku sukcesu, FALSE w
przypadku porażki.
Notatka:
Zobacz usort() i uksort() aby
zobaczyć przykłady zdefiniowanych przez użytkownika funkcji
porównujących.
Patrz także: usort(), uksort(),
sort(), asort(),
arsort(), ksort() i
rsort().
User Contributed Notesrlynch at lynchmarks dot com
17-May-2005 02:36
A subtle bug, corrected...
<?php
function masort(&$data, $sortby)
{
static $sort_funcs = array();
if (empty($sort_funcs[$sortby])) {
$code = "\$c=0;";
foreach (split(',', $sortby) as $key) {
$array = array_pop($data);
array_push($data, $array);
if(is_numeric($array[$key]))
$code .= "if ( \$c = ((\$a['$key'] == \$b['$key']) ? 0:((\$a['$key'] < \$b['$key']) ? -1 : 1 )) ) return \$c;";
else
$code .= "if ( (\$c = strcasecmp(\$a['$key'],\$b['$key'])) != 0 ) return \$c;\n";
}
$code .= 'return $c;';
$sort_func = $sort_funcs[$sortby] = create_function('$a, $b', $code);
} else {
$sort_func = $sort_funcs[$sortby];
}
$sort_func = $sort_funcs[$sortby];
uasort($data, $sort_func);
}
?>
Note that
$code .= "if ( \$c = ((\$a['$key'] == \$b['$key']) ? 0:((\$a['$key'] < \$b['$key']) ? -1 : 1 )) ) return \$c;";
Has had the "return \$c" added. Ultimately what the method is trying to accomplish is to build a chain of sort-order precedence. But this requires each evaluation to short-circuit out with a return. It was missing.
Peace
lucas dot karisny at linuxmail dot org
13-Feb-2005 03:09
The following is a modification of the dholme/messju masort func using david's float code with automatic data type detection. As long as the value isn't a string numeral (I.E. "1", '13.4') this should sort strings and numbers without having to explicity set which they are.
<?php
function masort(&$data, $sortby)
{
static $sort_funcs = array();
if (empty($sort_funcs[$sortby])) {
$code = "\$c=0;";
foreach (split(',', $sortby) as $key) {
$array = array_pop($data);
array_push($data, $array);
if(is_numeric($array[$key]))
$code .= "if ( \$c = ((\$a['$key'] == \$b['$key']) ? 0:((\$a['$key'] < \$b['$key']) ? -1 : 1 )) );";
else
$code .= "if ( (\$c = strcasecmp(\$a['$key'],\$b['$key'])) != 0 ) return \$c;\n";
}
$code .= 'return $c;';
$sort_func = $sort_funcs[$sortby] = create_function('$a, $b', $code);
} else {
$sort_func = $sort_funcs[$sortby];
}
$sort_func = $sort_funcs[$sortby];
uasort($data, $sort_func);
}
?>
siefer at sym dot net
04-Oct-2004 11:24
Hello naholyr at yahoo dot fr!
should it be
$cmp = create_function('$a, $b', "return $cmp_val;");
?
this works with my arrays ;-)
regards, Christopher
marek at lewczuk dot com
27-May-2004 01:01
Below another array sorting function - you can use many keys, whether order type is ascendant or descendant, if values of given key should be treat as string or numeric, if array keys should be preserved. This function is locale-safe - it means that string sorting will be based on setLocale settings. You should be aware that I did not make comprehensive tests, so be careful...
// my locales
SetLocale(LC_COLLATE,"pl_PL.UTF-8");
SetLocale(LC_CTYPE, "pl_PL.UTF-8");
function Array_Sort ($array, $arguments = Array(), $keys = true) {
// comparing function code
$code = "";
// foreach sorting argument (array key)
foreach ($arguments as $argument) {
// order field
$field = substr($argument, 2, strlen($argument));
// sort type ("s" -> string, "n" -> numeric)
$type = $argument[0];
// sort order ("+" -> "ASC", "-" -> "DESC")
$order = $argument[1];
// add "if" statement, which checks if this argument
should be used
$code .= "if (!Is_Numeric(\$result) || \$result == 0) ";
// if "numeric" sort type
if (strtolower($type) == "n") $code .= $order == "-" ? "\$result = (\$a['{$field}'] > \$b['{$field}'] ? -1 : (\$a['{$field}'] < \$b['{$field}'] ? 1 : 0));" : "\$result = (\$a['{$field}'] > \$b['{$field}'] ? 1 : (\$a['{$field}'] < \$b['{$field}'] ? -1 : 0));";
// if "string" sort type
else $code .= $order == "-" ? "\$result = strcoll(\$a['{$field}'], \$b['{$field}']) * -1;" : "\$result = strcoll(\$a['{$field}'], \$b['{$field}']);";
}
// return result
$code .= "return \$result;";
// create comparing function
$compare = create_function('$a, $b', $code);
// sort array and preserve keys
if ($keys) uasort($array, $compare);
// sort array, but not preserve keys
else usort($array, $compare);
// return array
return $array;
}
Example array:
$array['sdsd'] = array("dir" => 1, "name" => "sas", "olek" => "sdsd");
$array['sds2'] = array("dir" => 2, "name" => "śas", "olek" => "t");
Example - preserve keys:
print_r(Array_Sort($array, Array("s-name", "n-dir", "s+olek")));
Array
(
[sds2] => Array
(
[dir] => 1
[name] => śas
[olek] => t
)
[sdsd] => Array
(
[dir] => 1
[name] => sas
[olek] => sdsd
)
)
Example - without preserving keys:
print_r(Array_Sort($array, Array("s-name", "n-dir", "s+olek")), false);
Array
(
[0] => Array
(
[dir] => 1
[name] => śas
[olek] => t
)
[1] => Array
(
[dir] => 1
[name] => sas
[olek] => sdsd
)
)
Enyoj
david [__at__] castlelaing.com
10-May-2004 06:28
WARNING:-Regarding remmy.cjb.net (22-Oct-2003 05:57) mutisort() function:
Sorting by floating point numbers doesn't work in the current function. Use the modified version below if you want to sort by a floating point column.
<?php
function multisort($array)
{
for($i = 1; $i < func_num_args(); $i += 3)
{
$key = func_get_arg($i);
if (is_string($key)) $key = '"'.$key.'"';
$order = true;
if($i + 1 < func_num_args())
$order = func_get_arg($i + 1);
$type = 0;
if($i + 2 < func_num_args())
$type = func_get_arg($i + 2);
switch($type)
{
case 1: $t = 'strcasecmp($a[' . $key . '], $b[' . $key . '])';
break;
case 2: $t = '($a[' . $key . '] == $b[' . $key . ']) ? 0:(($a[' . $key . '] < $b[' . $key . ']) ? -1 : 1)';
break;
case 3: $t = 'strcmp($a[' . $key . '], $b[' . $key . '])';
break;
case 4: $t = 'strcasecmp($a[' . $key . '], $b[' . $key . '])';
break;
default: $t = 'strnatcmp($a[' . $key . '], $b[' . $key . '])';
break;
}
echo $t;
usort($array, create_function('$a, $b', '; return ' . ($order ? '' : '-') . '(' . $t . ');'));
}
return $array;
}
?>
dn dot php at gmx dot de
24-Nov-2003 01:34
regarding remmy.cjb.net (22-Oct-2003 05:57) note:
The "multisort" function is not working. Try the following example.
( I hope this and your note will be deleted soon.)
..- Denis
<?php
$a = array(
array('c1' => 1, 'c2' => 1, 'c3' => 1, 'c4' => 1),
array('c1' => 1, 'c2' => 1, 'c3' => 1, 'c4' => 2),
array('c1' => 1, 'c2' => 1, 'c3' => 2, 'c4' => 1),
array('c1' => 1, 'c2' => 1, 'c3' => 2, 'c4' => 2)
);
echo('<pre>');
print_r(multisort($a, "'c4'", true, 2,"'c3'", true, 2,"'c2'", true, 2,"'c1'", true, 2));
echo('</pre>');
?>
remmy.cjb.net
22-Oct-2003 08:57
Hope this helps!
- Remmy
<?php
function multisort($array)
{
for($i = 1; $i < func_num_args(); $i += 3)
{
$key = func_get_arg($i);
$order = true;
if($i + 1 < func_num_args())
$order = func_get_arg($i + 1);
$type = 0;
if($i + 2 < func_num_args())
$type = func_get_arg($i + 2);
switch($type)
{
case 1: $t = 'strcasenatcmp($a[' . $key . '], $b[' . $key . '])';
break;
case 2: $t = '$a[' . $key . '] - $b[' . $key . ']';
break;
case 3: $t = 'strcmp($a[' . $key . '], $b[' . $key . '])';
break;
case 4: $t = 'strcasecmp($a[' . $key . '], $b[' . $key . '])';
break;
default: $t = 'strnatcmp($a[' . $key . '], $b[' . $key . '])';
break;
}
uasort($array, create_function('$a, $b', 'return ' . ($order ? '' : '-') . '(' . $t . ');'));
}
return $array;
}
$a = array(
array('id' => 1, 'name' => 'apple'),
array('id' => 2, 'name' => 'orange'),
array('id' => 8, 'name' => 'banana'),
array('id' => 8, 'name' => 'grapefruit'),
array('id' => 9, 'name' => 'smoke'),
array('id' => 1, 'name' => 'screen')
);
echo('<pre>');
print_r(multisort($a, "'name'", true, 0, "'id'", false, 2));
echo('</pre>');
?>
cablehead
16-Sep-2003 06:08
dholmes we turned your masort function into a smarty plugin:
http://www.phpinsider.com/smarty-forum/viewtopic.php?t=1079
messju contributed the following performance improvements.
function masort(&$data, $sortby)
{
static $sort_funcs = array();
if (empty($sort_funcs[$sortby])) {
$code = "\$c=0;";
foreach (split(',', $sortby) as $key) {
$code .= "if ( (\$c = strcasecmp(\$a['$key'],\$b['$key'])) != 0 ) return \$c;\n";
}
$code .= 'return $c;';
$sort_func = $sort_funcs[$sortby] = create_function('$a, $b', $code);
} else {
$sort_func = $sort_funcs[$sortby];
}
$sort_func = $sort_funcs[$sortby];
uasort($data, $sort_func);
}
thank you for the cool function!
php at eden2 dot com
17-Jul-2003 01:36
Is it just me, or are the examples below misleading, and actually demonstrating situations that would be more appropriate for usort()?
After trying to make sense of the uasort() description, it sounds like it's more for sorting a 1D array like this:
"john" => "$23.12"
"tim" => "$6.50"
"bob" => "$18.54"
and getting back:
"tim" => "$6.50"
"bob" => "$18.54"
"john" => $23.12"
(assuming, of course, that your sort function is lopping off the $ and evaluating as a number -- which would complicate the use of asort() ;)
naholyr at yahoo dot fr
10-Jan-2003 06:35
You can sort a multidimensionnal array by any of its key with this function:
function multi_sort($array, $key)
{
$cmp_val="((\$a['$key']>\$b['$key'])?1:
((\$a['$key']==\$b['$key'])?0:-1))";
$cmp=create_function('$a, $b', "return $body;");
uasort($array, $cmp);
return $array;
}
example:
$myarray = array(
array("name"=>"kernighan", "language"=>"c"),
array("name"=>"lerdorf", "language"=>"php"),
array("name"=>"Stroustrup", "language"=>"c++"),
array("name"=>"Gosling", "language"=>"java")
);
multi_sort($myarray, "name") returns:
name=Gosling language=java
name=Kernighan language=c
name=Lerdorf language=php
name=Stroustrup language=c++
dholmes at jccc d0t net
09-Oct-2002 11:27
Here is a little sort function that actually uses a dynamic callback for usort to do it's thing.
It assumes your data is in the form of:
$data = array(
array('ID'=>'6','LAST'=>'Holmes','FIRST'=>'Dan'),
array('ID'=>'1234','LAST'=>'Smith','FIRST'=>'Agent K'),
array('ID'=>'2','LAST'=>'Smith','FIRST'=>'Agent J'),
array('ID'=>'4','LAST'=>'Barney','FIRST'=>'Bob'));
Now, you want to sort on one or more cols, don't you?
masort($data, 'LAST,FIRST');
or
masort($data,array('FIRST','ID'));
Of course you could add a bunch to it (like numeric comparison if appropriate, desc/asc, etc) but it works for me.
function masort(&$data, $sortby){
if(is_array($sortby)){
$sortby = join(',',$sortby);
}
uasort($data,create_function('$a,$b','$skeys = split(\',\',\''.$sortby.'\');
foreach($skeys as $key){
if( ($c = strcasecmp($a[$key],$b[$key])) != 0 ){
return($c);
}
}
return($c); '));
}
Notice that I am splitting the string in the comparison function? While this is certainly slower, it was the only way I would find to "pass" and "array". If anyone has a better way, please suggest. Then inside, we (string) compare the values only moving to the next key if the values are the same...and so on, and so on.
stilgar_cpsNOSPAM at zipmail dot NOSPAMcom dot br
05-Sep-2001 11:30
Use example:
$array[0]['Fator1']=7;
$array[0]['Fator2']="Name";
$array[1]['Fator1']=5;
$array[1]['Fator2']="Name";
$array[2]['Fator1']=7;
$array[2]['Fator2']="NameDiferente";
.....
We want to order by Fator1, then Fator2, then:
function Compare($ar1, $ar2)
{
if ($ar1['Fator1']<$ar2['Fator1'])
return -1;
else if ($ar1['Fator1']>$ar2['Fator1'])
return 1;
if ($ar1['Fator2']<$ar2['Fator2'])
return -1;
else if ($ar1['Fator2']>$ar2['Fator2'])
return 1;
return 0;
}
To sort now, we use:
uasort($array, 'Compare');
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