用户评论:
hrvoj3e at gmail dot com (-04-30 14:38:42)
Why not use
mb_convert_case($str, MB_CASE_TITLE, "UTF-8");
Works for me! :)
pfbouquet at gmail dot com (-04-07 12:30:26)
EasywaytoconvertarrayintoUtf_8:
{
if(is_array($array))
{
returnarray_map("utf8_encode_clever",$array);
}
else
{
returnutf8_encode($array);
}
}//here,wewillcallourfunctiontoconvert$data:$data=utf8_encode_clever($data);?>
James (-03-15 17:07:05)
array_map() can be applied to assoc arrays without affecting the keys
shakespeare32 at gmail dot com (-02-19 19:01:38)
Whynotanarrayofcallbacks?
if(!$callbacks){return$array;}
if(!is_array($callbacks)&&is_string($callbacks)&&function_exists($callbacks)){
returnarray_map($callbacks,$array);
}
foreach($callbacksas$callback){
if(function_exists($callback)){$array=array_map($callback,$array);
}
}
return$array;
}?>
godek dot maciek at gmail dot com (-04-19 07:01:43)
I came up with a convenient syntax for method application, particularly useful inside the array_map.
For instance, if you want to
array_map(function($object, $arg1) { return $object->method($arg1, "arg2"); }, $objects, $args1);
it is possible to provide a shorthand:
global $_; // necessary inside a function, unfortunately
array_map($_->method($_, "arg2"), $objects, $args1);
Here's the implementation (works with 5.3)
function m_caller($method) {
$args = func_get_args();
array_shift($args);
return function($object) use($method, $args) {
global $_;
$local_args = func_get_args();
array_shift($args);
if(!is_object($object)) {
// error
}
$reflection = new ReflectionMethod(get_class($object), $method);
foreach($args as $key => $arg) {
if($arg === $_) {
$args[$key] = array_shift($local_args);
}
}
return $reflection->invokeArgs($object, array_merge($args, $local_args));
};
}
class MethodCaller {
public function __call($name, $arguments) { return call_user_func_array('m_caller', array_merge(array($name), $arguments)); }
public function __get($name) { return m_caller($name); }
};
$_ = new MethodCaller();
qeremy (-03-07 10:35:00)
Analternativeforrecursivemapping;
foreach($arras$k=>$v){$rarr[$k]=is_array($v)
?array_map_recursive($fn,$v)
:$fn($v);//orcall_user_func($fn,$v)}
return$rarr;
}
functionsqr($x){
return"$x^2=".($x*$x);
}$a=array(1,2,3,array(4,array(5)));$b=array_map_recursive("sqr",$a);print_r($b);?>
Array
(
[0]=>1^2=1
[1]=>2^2=4
[2]=>3^2=9
[3]=>Array
(
[0]=>4^2=16
[1]=>Array
(
[0]=>5^2=25
)
)
)
@mspreij (-02-26 22:48:19)
HopeI'mnotlatetotheparty,here'smyfunctiontoapplyarray_maptothe*keys*ofanarray.
Extraarrayargumentswillbeusedforthecallbackfunction'sparametersjustlikewitharray_map,withthedifferencethatastringisalsoallowed:itwilljustbeusedtocreateanarrayofappropriatelengthwithaseachvaluethatstring.Arraysareleftalone(andwillbepaddedwithnullsbyarray_mapasneeded).
//array_map_keys($callback,$array,[$args,..])/functionarray_map_keys($callback,$array/*[,$args..]*/){$args=func_get_args();
if(!is_callable($callback))trigger_error("firstargument(callback)isnotavalidfunction",E_USER_ERROR);
if(!is_array($array))trigger_error("secondargumentmustbeanarray",E_USER_ERROR);$args[1]=array_keys($array);//Ifanyadditionalargumentsarenotarrays,assumethatvalueiswantedforevery$arrayitem.
//array_map()willpadshorterarrayswithNullvaluesfor($i=2;$i
if(!is_array($args[$i])){$args[$i]=array_fill(0,count($array),$args[$i]);
}
}
returnarray_combine(call_user_func_array('array_map',$args),$array);
}//Someexamples:$arr=array('foo'=>123,'bar'=>456);//simplyuppercasekeys:var_dump(array_map_keys('strtoupper',$arr));//or..var_dump(array_map_keys(function($input){returnstrtoupper($input);},$arr));//>>array(2){["FOO"]=>int(123),["BAR"]=>int(456)}
//Addaprefix'myvar_':var_dump(array_map_keys(function($input,$prefix){return$prefix.$input;},$arr,'myvar_'));//>>array(2){["myvar_foo"]=>int(123),["myvar_bar"]=>int(456)}
//Apartfromthe(staticstring)prefix,wealsonumberthem:$arr=array('foo'=>123,'bar'=>456,'bazz'=>789,'yadda'=>'0AB');var_dump(array_map_keys(function($input,$middle,$number){return$number.':'.$middle.$input;},$arr,'myvar_',range(1,count($arr))));//>>array(4){["1:myvar_foo"]=>int(123),["2:myvar_bar"]=>int(456),["3:myvar_bazz"]=>int(789),["4:myvar_yadda"]=>string(3)"0AB"}?>
php/hotblocks/nl (-11-28 05:00:17)
Notethatthe$arrargumenthastobeanarray,notjustaTraversable/Iterator.
Forinstancethiswon'twork:
$documents=$mongo->db->collection->find();//$documentsisTraversablebyforeach$ids=array_map(function($document){
return$document['_id'];
},$objects);//$idswillnowbeNULL,because$documentswasn'tanArray?>
Asolutionistofirstuseiterator_to_array():
$ids=array_map(function($document){
return$document['_id'];
},iterator_to_array($objects));//$idswillnowbeanarrayof['_id']s?>
Butthisisnotveryefficient:twocyclesinsteadofone.Anothersolutionistouseforeach:onecycleandalotoffreedom(andinthesamescope).
erik dot stetina at gmail dot com (-09-27 03:05:01)
functiontoprefixgivenstringtoeachelementofanarray:
{$callback=create_function('$str','return"'.$prefix.'".$str;');
returnarray_map($callback,$array);
}?>
usage:
$dir="./css/";$files=scandir($dir);$files=array_prefix_values($dir,$files);print_r($files);?>
output:
(
[0]=>./css/.
[1]=>./css/..
[2]=>./css/default.css
[4]=>./css/helper.css
[6]=>./css/page_layout.css
)
spark at limao dot com dot br (-09-08 07:48:09)
it'sausefullwaytofilteruserinputthroughgetandpostrequestarrays:
$get=array_map("addslashes",$_GET);?>
gordon dot mcvey at ntlworld dot com (-01-28 05:11:42)
Youcanusearray_mapwithPHPnativefunctionsaswellasuserfunctions.Thisisveryhandyifyouneedtosanitizearrays.
$integers=array_map('intval',$integers);$safeStrings=array_map('mysql_real_escape_string',$unsafeStrings);?>
pike-php at kw dot nl (-01-11 06:04:59)
Ifyou'relookingforawaytoflattenmultimaps,lookatthis:
$multimap=array(
array("name"=>"value1"),
array("name"=>"value2"),
array("name"=>"value3")
);$flatmap=array_map("array_pop",$multimap);print_r($flatmap);?>
Output:
Array
(
[0]=>value1
[1]=>value2
[2]=>value3
)
brendan DOT caffrey AT me DOT com (-07-10 15:42:31)
Somethingthathadmeconfused:
classCallback{
staticfunctionadd($a){return$a+1;}
}$array=array(0,1,2);array_map(array('Callback','add'),$array);//willnotwork,eventhoughyou'recallingthisinthetestnamespacearray_map(array('test\Callback','add'),$array);//willwork?>
virtual dot greg at gmail dot com (-03-05 03:07:35)
PHP5.3enablesustouseinlineanonymousfunctionswitharray_map,cleaningupthesyntaxslightly.
$data=array(
array('id'=>1,'name'=>'Bob','position'=>'Clerk'),
array('id'=>2,'name'=>'Alan','position'=>'Manager'),
array('id'=>3,'name'=>'James','position'=>'Director')
);$names=array_map(
function($person){return$person['name'];},$data);print_r($names);?>
Thiswaspossible(althoughnotrecommended)inpriorversionsofPHP5,viacreate_function().
$names=array_map(create_function('$person','return$person["name"];'),$data);?>
You'relesslikelytocatcherrorsinthelatterversionbecausethecodeispassedasstringarguments.
Thesearealternativestousingaforeach:
$names=array();
foreach($dataas$row){$names[]=$row['name'];
}?>
kelly m (-02-17 14:28:28)
Irealizethisfunctioniseasyenoughtomake,butthisisafasterversion(twicethespeed)of[afunction]whichIfindincrediblyuseful.
if(is_array($key)||!is_array($input))returnarray();$array=array();
foreach($inputas$v){
if(array_key_exists($key,$v))$array[]=$v[$key];
}
return$array;
}?>
Usage:
onassar at gmail dot com (-10-13 19:06:13)
Fixedabugwitharrayrecursion.
*arrayMapfunction.Customizedarray_mapfunctionwhichpreserveskeys/associatearrayindexes.Notethatthiscostsadescentamountmorememory(eg.1.5kpercall)
*
*@accesspublic
*@paramcallback$callbackCallbackfunctiontorunforeachelementineacharray.
*@parammixed$arr1Anarraytorunthroughthecallbackfunction.
*@paramarray$arrayVariablelistofarrayarugmentstorunthroughthecallbackfunction.
*@returnarrayArraycontainingalltheelementsof$arr1afterapplyingthecallbackfunctiontoeachone,recursively,maintainkeys.
*/functionarrayMap($callback,$arr1){$results=array();$args=array();
if(func_num_args()>2)$args=(array)array_shift(array_slice(func_get_args(),2));
foreach($arr1as$key=>$value){$temp=$args;array_unshift($temp,$value);
if(is_array($value)){array_unshift($temp,$callback);$results[$key]=call_user_func_array(array('self','arrayMap'),$temp);
}else{$results[$key]=call_user_func_array($callback,$temp);
}
}
return$results;
}?>
onassar at gmail dot com (-10-11 15:33:07)
Wroteupmyownkeypreservationfunctionforarraymapping.Itallowsnargumentstobepassed,andshouldbeeasyenoughtofollowifyouneedtomakeanymods.Ifyou'vegotanythoughtsletmeknow.
*arrayMapfunction.Customizedarray_mapfunctionwhichpreserveskeys/associatearrayindexes.
*
*@accesspublic
*@paramcallback$callbackCallbackfunctiontorunforeachelementineacharray.
*@parammixed$arr1Anarraytorunthroughthecallbackfunction.
*@paramarray$arrayVariablelistofarrayarugmentstorunthroughthecallbackfunction.
*@returnarrayArraycontainingalltheelementsof$arr1afterapplyingthecallbackfunctiontoeachone,recursively,maintainkeys.
*/functionarrayMap($callback,$arr1){$results=array();$args=array();
if(func_num_args()>2)$args=(array)array_shift(array_slice(func_get_args(),2));
foreach($arr1as$key=>$value){
if(is_array($value)){array_unshift($args,$value);array_unshift($args,$callback);$results[$key]=call_user_func_array(array('self','arrayMap'),$args);
}
else{array_unshift($args,$value);$results[$key]=call_user_func_array($callback,$args);
}
}
return$results;
}?>
macnimble at gmail dot com (-09-10 12:27:49)
IrecentlydiscoveredthatPHPhasnoloop-freemannerformodifyingthekeysinanarray.Iwashopingtouseabuilt-infunctiontoprefixthekeys.
Havingfoundnonativefunctiontodothis,Ithrewtogetherthismonster:
{$args=func_get_args();$prefix=array_shift($args);$func=create_function('$p,$k','return"$p{$k}";');
foreach($argsAS$key=>$array):$args[$key]=array_combine(array_map($func,array_fill(0,count($array),$prefix)
,array_keys($array)
)
,array_values($array)
);
endforeach;
return$args;
}$array1=array('id'=>1,'title'=>'about-us','author'=>'BillBrown','dated'=>'-SEP-15');$array2=array('id'=>2,'title'=>'about-them','author'=>'BillSmith','dated'=>'-SEP-15');
echo'
',print_r($array1,1),print_r($array2,1),'
';$array=array_prefix_keys("content_",$array1,$array2);$array1=$array[0];$array2=$array[1];
echo'
',print_r($array1,1),print_r($array2,1),'
';?>
Thiswillproducethefollowingoutput:
Array
(
[id]=>1
[title]=>about-us
[author]=>BillBrown
[dated]=>-SEP-15
)
Array
(
[id]=>2
[title]=>about-them
[author]=>BillSmith
[dated]=>-SEP-15
)
Array
(
[content_id]=>1
[content_title]=>about-us
[content_author]=>BillBrown
[content_dated]=>-SEP-15
)
Array
(
[content_id]=>2
[content_title]=>about-them
[content_author]=>BillSmith
[content_dated]=>-SEP-15
)
Hopeithelps!
Bill
[EDITBYdanbrownATphpDOTnet:Theoriginalfunctionandnotewasremovedinfavorofthisupdatebytheoriginalauthor.Theoriginalnotealsocontainedthefollowingdescriptivetext.]
IrecentlydiscoveredthatPHPhasnoloop-freemannerformodifyingthekeysinanarray.Iwashopingtouseabuilt-infunctiontoprefixthekeys.
Havingfoundnonativefunctiontodothis,Ithrewtogetherthismonster.
ethaizone at hotmail dot com (-09-01 19:34:14)
MyEnglishisweakbutIwanttosharemycode.
IwanttochangeformationofarraybutwhenIusenulliscallbackfunctioninarray_map().
IthasprobleminresultsoIwritenewsmallfunctionforit.
foreach($arras$k=>$v)
foreach($vas$k2=>$v2)$new_arr[$k2][$k]=$v[$k2];
return$new_arr;
}?>
Input:
Array
(
[Human]=>Array
(
[0]=>1
[1]=>2
[2]=>3
[3]=>4
)
[Pet]=>Array
(
[0]=>Cat
[1]=>Dog
[2]=>Rabbit
[3]=>Rat
)
)
OutPut:
Array
(
[0]=>Array
(
[Human]=>1
[Pet]=>Cat
)
[1]=>Array
(
[Human]=>2
[Pet]=>Dog
)
[2]=>Array
(
[Human]=>3
[Pet]=>Rabbit
)
[3]=>Array
(
[Human]=>4
[Pet]=>Rat
)
)
Ihopeitcanuseful.
galenjr at gmail dot com (-06-14 23:19:50)
Anotherwaytoarray_maphtmlentitieswithaspecificquotestyleistocreateafunctionthatdoesitandmapthatfunction
returnhtmlentities($str,ENT_QUOTES);
}$good_array=array_map('map_entities',$bad_array);?>
radist-hack at yandex dot ru (-11-01 13:37:35)
Totransposerectangulartwo-dimensionarray,usethefollowingcode:
array_unshift($array,null);
$array=call_user_func_array("array_map",$array);
Ifyouneedtorotaterectangulartwo-dimensionarrayon90degree,addthefollowinglinebeforeorafter(dependingontherotationdirectionyouneed)thecodeabove:
$array=array_reverse($array);
Hereisexample:
$a=array(
array(1,2,3),
array(4,5,6));array_unshift($a,null);$a=call_user_func_array("array_map",$a);print_r($a);?>
Output:
Array
(
[0]=>Array
(
[0]=>1
[1]=>4
)
[1]=>Array
(
[0]=>2
[1]=>5
)
[2]=>Array
(
[0]=>3
[1]=>6
)
)
Heero (-10-16 10:02:57)
YoucaneasilyremoveallHTMLtagsfrom$_GETor$_POSTvariablesusingsomethinglikethis:
$_POST=array_map('strip_tags',$_POST);$_GET=array_map('strip_tags',$_GET);?>
Thisisusefulwhenyoudon'twanttoparseHTML.
stijnleenknegt at gmail dot com (-07-22 16:17:11)
IfyouwanttopassanargumentlikeENT_QUOTEStohtmlentities,youcandothefollow.
$array=array_map('htmlentities',$array,array_fill(0,count($array),ENT_QUOTES));?>
Thethirdargumentcreatesanequalsizedarrayof$arrayfilledwiththeparameteryouwanttogivewithyourcallbackfunction.
GUI (-06-26 07:48:36)
Thefollowingtakesanarrayofobjects,andreturnstheresultofcallingamemberfunctiononeachobject.SoifIhaveanarrayofobjectsthatallhaveagetName()method,callingarray_map_objects("getName",$thingies)willreturnthearrayfilledwiththegetName()valueforeachobject.
if(is_string($member_function)&&is_array($array)){$callback=create_function('$e','returncall_user_func(array($e,"'.$member_function.'"));');$values=array_map($callback,$array);
}
return$values;
}?>
BloodElf (-04-27 06:32:13)
Hereisasimplewaytohighlightthematchedwordsinthesearchresults:
static$num=1;
return''.$word.'';
}$text="alabalanicaturskapanica";$search="balaturska";$words=explode('',$search);
echostr_replace($words,array_map("highlight",$words),$text);
moester at gmail dot com (-04-02 13:21:38)
Wishthiswasbuiltin.MimicsRubyandPrototype'sarraypluckfunction.Returnsspecifickey/columnfromanarrayofobjects.
{
if(is_array($key)||!is_array($array))returnarray();$funct=create_function('$e','returnis_array($e)&&array_key_exists("'.$key.'",$e)?$e["'.$key.'"]:null;');
returnarray_map($funct,$array);
}//usage:$a=array(array("id"=>10,"name"=>"joe"),array("id"=>11,"name"=>"bob"));$ids=array_pluck("id",$a);//==array(10,11)$names=array_pluck("name",$a);//==array("joe","bob")
//worksonnon-keyedarraysalso:$a=array(array(3,4),array(5,6));$col2=array_pluck(1,$a);//==array(4,6)(grab2ndcolumnofdata)?>
chreekat (-03-12 15:48:54)
I was miffed that array_map didn't have a way to pass values *and* keys to the callback, but then I realized I could do this:
function callback($k, $v) { ... }
array_map( "callback", array_keys($array), $array);
jo at ho dot nl (-02-17 14:10:46)
Couldalsousethingslike...
array_keys();andarray_values();offcourse...
Howeverit'sjustanexampleoffrecursionviathisfunction..
WhichIfoundprettyhandyattimesdealingwitharrays..
couldalsouse:
call_user_func(array($this,__FUNCTION),$args);?>
or
call_user_fuc_array(array($this,__FUNCTION__),$array);?>
or
publicfunction__construct($arg){
if(is_array($arg)){
newself($arg);
}
else{
echo$arg.'
'.PHP_EOL;
}
}
}?>
Anyway..plentyoffexamples..
Itwasjustanideaforothers...
avartabedian at webservice dot com dot uy (-02-08 05:39:36)
loaded67athotmaildotcom,thereisalittleerrorintheaddfuncparamsvalues.
Warning:Missingargument2fortest::add(),calledin/tmp/test.phponline34anddefinedin/tmp/test.phponline6
Array=>
nowitruns...
}/*procedural*/else{
echo$key.'=>'.$value.'
'.PHP_EOL;//dostuff...
//if(!isset($this->container[$key])){
//$this->container[$key]=$value;
//}
//else{//trigger_error()xorthrownewException?
//echo'allreadyexists!
'.PHP_EOL;
//}}
}
}//$array=array('one'=>'value1','two'=>'value2','three'=>'value3');$t=newtest;$t->add($array);?>
goodluck!
loaded67 at hotmail dot com (-02-08 02:59:23)
thisfunctionisreallyniceforrecursioninphp!!!
exampleinaclass:
}/*procedural*/else{
echo$key.'=>'.$value.'
'.PHP_EOL;//dostuff...
//if(!isset($this->container[$key])){
//$this->container[$key]=$value;
//}
//else{//trigger_error()xorthrownewException?
//echo'allreadyexists!
'.PHP_EOL;
//}}
}
}//$array=array('one'=>'value1','two'=>'value2','three'=>'value3');$t=newtest;$t->add($array);?>
youcouldeasielydothiswithoutaclasstoooffcourse!
usedinphp5.2.5
pmf (-01-22 19:02:13)
Thisfunctionbehavesexactlylikearray_mapbutadditionallydoesnotrejectnon-arrayarguments.Instead,ittransformsthemwiththearray_fillfunctiontoaconstantvaluedarrayofrequiredlengthaccordingtotheotherarrayarguments(ifany)andexecutestheoriginalarray_mapfunction.
returncall_user_func_array("array_map",$args);
}?>
Example:
$get="first=value1&second=value2&third=value3";print_r(array_map2("explode","=",explode("&",$get)));?>
wouldprintout:
(
[0]=>Array
(
[0]=>first[1]=>value1)
[1]=>Array
(
[0]=>second[1]=>value2)
[2]=>Array
(
[0]=>third[1]=>value3)
)?>
/pmf
henrique at webcoder dot com dot br (-11-01 08:02:18)
Adding method support to function by Andref (multidimensionalArrayMap).
function array_map_r( $func, $arr )
{
$newArr = array();
foreach( $arr as $key => $value )
{
$newArr[ $key ] = ( is_array( $value ) ? array_map_r( $func, $value ) : ( is_array($func) ? call_user_func_array($func, $value) : $func( $value ) ) );
}
return $newArr;
}
array_map_r('function', array());
or
array_map_r(array('class', 'method'), array());
bturchik at iponweb dot net (-07-19 07:46:15)
Maybe this one will be useful for someone:
function array_map_helper($mapper, $array) {
$mapper = preg_replace('/^return (.*?);$/', '$1', trim($mapper));
$result = array();
if (preg_match('/(\(?)(.*?)\s*=>\s*(.*?)(\)?)$/', $mapper, $matches)) {
list($full_found, $array_open, $left, $right, $array_close) = $matches;
if ($array_open && $array_close) {
$mapper = '$result[] = array' . $full_found . ';';
} else {
$mapper = '$result[' . $left . '] = ' . $right . ';';
}
} else {
$mapper = '$result[] = ' . $mapper . ';';
}
foreach ($array as $key => $value) {
eval($mapper);
}
return $result;
}
should be used like:
$array = array(array('foo' => 11, 'bar' => 22),
array('foo' => 111, 'bar' => 222),
array('foo' => 1111, 'bar' => 2222));
$mapped = array_map_helper('$value["foo"] => $value["bar"]', $array);
var_dump will give
array(3) {
[11]=>
int(22)
[111]=>
int(222)
[1111]=>
int(2222)
}
or
$mapped = array_map_helper('$value["foo"]', $array);
var_dump will give
array(3) {
[0]=>
int(11)
[1]=>
int(111)
[2]=>
int(1111)
}
or
$mapped = array_map_helper('$value["foo"] + $value["bar"] . " at position $key"', $array);
var_dump will give
array(3) {
[0]=>
string(16) "33 at position 0"
[1]=>
string(17) "333 at position 1"
[2]=>
string(18) "3333 at position 2"
}
andref dot dias at pronus dot eng dot br (-10-24 12:14:17)
Arecursivewaytohandlemultidimensionalarrays:
{$newArr=array();
foreach($arras$key=>$value)
{$newArr[$key]=(is_array($value)?multidimensionalArrayMap($func,$value):$func($value));
}
return$newArr;
}?>
pcdinh at phpvietnam dot net (-03-17 20:50:57)
Hi benjaminhill,
You can apply a method of a instantiated class to array_maps as follows:
class Maths {
function addOne($input) {
return ($input + 1);
}
}
$maths = new Maths();
$sum = array_map(array($maths, \\\'addOne\\\'), array(1, 2));
// where $maths is the object which has been instantiated before and addOne is its method without its own parameters
var_dump($sum);
The code fragment will return:
array
0 => 2
1 => 3
However, I love a syntax like this:
$sum = array_map($maths->addOne($this), array(1, 2));
where $this should be interpreted as each values extracted from the subsequent array, which in this case is array(1, 2).
This syntax reminds me of Javascript syntax.
PHP\\\'s callback mechanism should be improved.
(-08-26 06:57:43)
Here'safunction,veryhelpfulltome,thatallowsyoutomapyourcallbackonmixedargs.
<?phpfunctionarray_smart_map ($callback){//Initialization$args=func_get_args();array_shift($args);//suppressingthecallback$result=array();//Validatingparametersforeach($argsas$key=>$arg)
if(is_array($arg)){//thefirstarrayfoundgivesthesizeofmappingandthekeysthatwillbeusedfortheresultingarrayif(!isset($size)){$keys=array_keys($arg);$size=count($arg);//theothersarraysmusthavethesamedimension}elseif(count($arg)!=$size){
returnFALSE;
}//allkeysaresuppressed$args[$key]=array_values($arg);
}//doingthecallbackthingif(!isset($size))//ifnoarrayswerefound,returnstheresultofthecallbackinanarray$result[]=call_user_func_array($callback,$args);
else
for($i=0;$i
foreach($argsas$arg)$column[]=(is_array($arg)?$arg[$i]:$arg);$result[$keys[$i]]=call_user_func_array($callback,$column);
}
return$result;
}?>
Tryingwith:
Returns:
array(
[foo]=>array(
0=>bar1
1=>bar2
2=>bar3
)
[bar]=>array(
1=>foo1
)
)
david dot tulloh at infaze dot com dot au (-07-06 16:53:52)
Youcanpassvaluestoarray_mapbyreference,essentiallyallowingyoutouseitasyouwouldarray_walkwithmultiplearraysasparameters.
Atrivialexample:
$a=array(1,2,3,4,5);$add_func=create_function('&$x,$y','$x+=$y;');array_map($add_func,$a,$a);print_r($a);?>Array
(
[0]=>2
[1]=>4
[2]=>6
[3]=>8
[4]=>10
)
Vinicius Cubas Brand (-03-23 05:31:01)
Thefollowingfunctiondoesexacltythesamethingofarray_map.However,maintainsthesameindexoftheinputarrays
{$res=array();
if($param3!==NULL)
{
foreach(array(2,3)as$p_name)
{
if(!is_array(${'param'.$p_name}))
{trigger_error(__FUNCTION__.'():Argument#'.$p_name.'shouldbeanarray',E_USER_WARNING);
return;
}
}
foreach($param2as$key=>$val)
{$res[$key]=call_user_func($param1,$param2[$key],$param3[$key]);
}
}
else
{
if(!is_array($param2))
{trigger_error(__FUNCTION__.'():Argument#2shouldbeanarray',E_USER_WARNING);
return;
}
foreach($param2as$key=>$val)
{$res[$key]=call_user_func($param1,$param2[$key]);
}
}
return$res;
}?>
Forinstance:
$arr1=array('3'=>'a','4'=>'b','5'=>'c');$arr2=array('3'=>'d','4'=>'e','5'=>'f');$arr3=array_map_keys(create_function('$a,$b','return$a.$b;'),$arr1,$arr2);print_r($arr3);?>
Theresultwillbe:
Array
(
[3]=>ad
[4]=>be
[5]=>cf
)
endofyourself at yahoo dot com (-02-19 23:29:40)
Ifyouneedtocallastaticmethodfromarray_map,thiswillNOTwork:
array_map('myclass::myMethod',$value);?>
Instead,youneedtodothis:
array_map(array('myclass','myMethod'),$value);?>
ItishelpfultorememberthatthiswillworkwithanyPHPfunctionwhichexpectsacallbackargument.
nd0 at gmx dot de (-07-02 04:42:52)
array_mapworksalsofinewithcreate_function:
$a=array(1,2,3,4,5);$b=array_map(create_function('$n','return$n*$n*$n;'),$a);print_r($b);?>
ifyouwanttomanipulatetheelementsofthearray,insteadtoonacopy,
thantakealookatarray_walk:
$a=array(1,2,3,4,5);array_walk($a,create_function('&$n','$n=$n*$n*$n;'));print_r($a);?>
TheResultofbothis:
Array
(
[0]=>1
[1]=>8
[2]=>27
[3]=>64
[4]=>125
)
bishop (-04-09 17:07:03)
Occasionally,youmayfindthatyouneedtopulloutacolumn(orseveral)fromanarray.Here'samap-likefunctiontodothat:
foreach(array_keys($arrays)as$arrayKey){$newArray=array();
foreach($indexesas$index){$newArray[$index]=$arrays[$arrayKey][$index];
unset($arrays[$arrayKey][$index]);
}$newArrays[$arrayKey]=$newArray;
}
return$newArrays;
}?>
So,doingthis:
$t1=array(2=>array('a','b','c'),1=>array('d','e','f'),5=>array('g','h','i'),
);$t2=array_shear($t1,1,0);?>
willresultin:
$t1=array(2=>array(2=>'c',),1=>array(2=>'f',),5=>array(2=>'i',),
);$t2=array(2=>array(1=>'b',0=>'a',),1=>array(1=>'e',0=>'d',),5=>array(1=>'h',0=>'g',),
);?>
stephen at mu dot com dot au (-01-06 22:02:12)
Anotewhendoingsomethingallongthelinesof:
var$var;
functionbar(){array_map(array($this,"baz"),array(1,2,3));
}
functionbaz($arg){$this->var=$this->var+$arg;
}
}?>
Thiswill*not*workasexpected.Youneedtopass$thisbyreferenceaswith:
array_map(array(&$this,"baz"),array(1,2,3));
oryou'llbemakingacopyoftheobjecteachtime,changingavalue,thenthrowingtheresultaway.
dan at mojavelinux dot com (2002-06-14 22:07:08)
Hereisabetter,moretrueversionofadeeparray_map.Theonlynegativeofthisfunctionisthatthearrayispassedbyreference,sojustbeawareofthat.(patcheswelcome)
}
foreach(array_keys($in_array)as$key){//weneedareference,notacopy,normalforeachwon'tdo$value=&$in_array[$key];//weneedtocopyargsbecausewearedoing
//manipulationonitfartherdown$args=$in_args;
if(is_array($value)){array_map_deep($value,$in_func,$in_args,$in_index);
}
else{array_splice($args,$in_index-1,$in_index-1,$value);$value=call_user_func_array($in_func,$args);
}
}
return$in_array;
}?>
Thisisaneatfunctionbecauseyoucanpassanarray,afunction,andanarrayofparameters,andfinally,andindexofwhereinthearrayofparametersforthecallbackfunctionthecontentsyouaremappingshouldgetreplaced.Thisindexishumanbased(startsat1),andcanbeusedinsomethinglikeapreg_replacecallback,wherethecontentsmustbethe3rdindex.Enjoy!
![[PHP]将回调函数作用到给定数组的单元上](https://300zi.50zi.cn/uploadfile/img/14/563/85fccfcbdbbb19828f582da183aa2bc9.jpg)
