I`m using $_POST array with results of checkbox's selected from a form.
I'm thinking of using php in_array function but how could I extract only values that start with chk Given the following array:
Array (
[chk0] => 23934567622639616
[chk3] => 23934567622639618
[chk4] => 23934567622639619
[select-all] => on
[process] => Process
)
Thanks!
Simple and fast
$result=array();
foreach($_POST as $key => $value){
if(substr($key, 0, 2) == 'chk'){
$result[$key] = $value;
}
}
Lots of ways to do this, I like array_filter.
Example:
$result = array_filter(
$_POST,
function ($key) {
return strpos($key, "chk") === 0;
},
ARRAY_FILTER_USE_KEY
);
Here's a solution from http://php.net/manual/en/function.preg-grep.php
<?php
function preg_grep_keys($pattern, $input, $flags = 0) {
return array_intersect_key($input, array_flip(preg_grep($pattern, array_keys($input), $flags)));
}
?>
I would use array_filter
$ary = array_filter($originalArray,
function($key){ return preg_match('/chk/', $key); },
ARRAY_FILTER_USE_KEY
);
Related
This is my array:
['apple']['some code']
['beta']['other code']
['cat']['other code 2 ']
how can I replace all the "e" letters with "!" in the key name and keep the values
so that I will get something like that
['appl!']['some code']
['b!ta']['other code']
['cat']['other code 2 ']
I found this but because I don't have the same name for all keys I can't use It
$tags = array_map(function($tag) {
return array(
'name' => $tag['name'],
'value' => $tag['url']
);
}, $tags);
I hope your array looks like this:-
Array
(
[apple] => some code
[beta] => other code
[cat] => other code 2
)
If yes then you can do it like below:-
$next_array = array();
foreach ($array as $key=>$val){
$next_array[str_replace('e','!',$key)] = $val;
}
echo "<pre/>";print_r($next_array);
output:- https://eval.in/780144
You can stick with array_map actually. It is not really practical, but as a prove of concept, this can be done like this:
$array = array_combine(
array_map(function ($key) {
return str_replace('e', '!', $key);
}, array_keys($array)),
$array
);
We use array_keys function to extract keys and feed them to array_map. Then we use array_combine to put keys back to place.
Here is working demo.
Here we are using array_walk and through out the iteration we are replacing e to ! in key and putting the key and value in a new array.
Try this code snippet here
<?php
$firstArray = array('apple'=>'some code','beta'=>'other code','cat'=>'other code 2 ');
$result=array();
array_walk($firstArray, function($value,$key) use (&$result) {
$result[str_replace("e", "!", $key)]=$value;
});
print_r($result);
If you got this :
$firstArray = array('apple'=>'some code','beta'=>'other code','cat'=>'other code 2 ');
You can try this :
$keys = array_keys($firstArray);
$outputArray = array();
$length = count($firstArray);
for($i = 0; $i < $length; $i++)
{
$key = str_replace("e", "!", $keys[ $i ]);
$outputArray[ $key ] = $firstArray[$keys[$i]];
}
We can iterate the array and mark all problematic keys to be changed. Check for the value whether it is string and if so, make sure the replacement is done if needed. If it is an array instead of a string, then call the function recursively for the inner array. When the values are resolved, do the key replacements and remove the bad keys. In your case pass "e" for $old and "!" for $new. (untested)
function replaceKeyValue(&$arr, $old, $new) {
$itemsToRemove = array();
$itemsToAdd = array();
foreach($arr as $key => $value) {
if (strpos($key, $old) !== false) {
$itemsToRemove[]=$key;
$itemsToAdd[]=str_replace($old,$new,$key);
}
if (is_string($value)) {
if (strpos($value, $old) !== false) {
$arr[$key] = str_replace($old, $new, $value);
}
} else if (is_array($value)) {
$arr[$key] = replaceKeyValue($arr[$key], $old, $new);
}
}
for ($index = 0; $index < count($itemsToRemove); $index++) {
$arr[$itemsToAdd[$index]] = $itemsToRemove[$index];
unset($arr[$itemsToRemove[$index]]);
}
return $arr;
}
Another option using just 2 lines of code:
Given:
$array
(
[apple] => some code
[beta] => other code
[cat] => other code 2
)
Do:
$replacedKeys = str_replace('e', '!', array_keys($array));
return array_combine($replacedKeys, $array);
Explanation:
str_replace can take an array and perform the replace on each entry. So..
array_keys will pull out the keys (https://www.php.net/manual/en/function.array-keys.php)
str_replace will perform the replacements (https://www.php.net/manual/en/function.str-replace.php)
array_combine will rebuild the array using the keys from the newly updated keys with the values from the original array (https://www.php.net/manual/en/function.array-combine.php)
There is an array of airports that gets filled with a user list.
$airport_array[$airport_row['airportICAO']] = array(
'airportName' => $airport_row['airportName'],
'airportCity' => $airport_row['airportCity'],
'airportLat' => $airport_row['airportLat'],
'airportLong' => $airport_row['airportLong'],
'airportUserCount' => 0,
'airportUserList' => array()
);
After filling, "airportUserCount" will either be 0 or higher than 1. Now, I want to remove all airports from the array where airportUserCount is set to 0. What is the most performant way to do it? I thought about a foreach loop but I fear it's not necessarily the most elegant solution.
Use this code
foreach($airport_array as $key=>$value){
if($value['airportUserCount']==0){
unset($airport_array[$key]);
}
}
Here is live demo : https://eval.in/608462
$new_airports = array_filter(
$old_airports,
function($a) { return 0 < $a['airportUserCount']; }
);
foreach loop, check for the ones that have the Count == 0 then remove them from the array.
$result = array();
foreach ($airport_array[$airport_row['airportICAO']] as $arrays)
{
if($arrays['airportUserCount'] == 0) {
array_push($result, $arrays);
}
}
Use array_filter:
$a = array_filter($a, function($v) { return $v['airportUserCount'] != 0; });
Demo :- https://eval.in/608464
array_filter allows you to iterate through an array while using a callback function to check values.
function filterAirports($airports){
return ($airport['airportUserCount'] == 0) ? true : false ;
}
print_r(array_filter($airport_array, "filterAirports"));
I have this kind of simple array:
$puctures=array('1_noname.jpg','2_new.jpg','1_ok.jpg','3_lets.jpg','1_stack.jpg','1_predlog.jpg','3_loli.jpg');
I want to make new array that i will only have elements thats starts with 1_
Example
$new=array('1_noname.jpg','1_ok.jpg','1_stack.jpg','1_predlog.jpg');
Something like array_pop but how?
See array_filter():
$new = array_filter(
$puctures,
function($a) {return substr($a, 0, 2) == '1_'; }
);
A simple loop will do.
foreach ($pictures as $picture) {
if (substr($picture, 0, 2) == "1_") {
$new[] = $picture;
}
}
Use array_filter() to get your array:
$new = array_filter($puctures, function($item)
{
//here strpos() may be a better option:
return preg_match('/^1_/', $item);
});
This examples uses array_push() & strpos()
$FirstPictures = array();
foreach( $pictures as $pic => $value ) {
if ( strpos( $value, '1_' ) !== 0 ) {
array_push( $FirstPictures, $pic );
}
}
$puctures=array('1_noname.jpg','2_new.jpg','1_ok.jpg','3_lets.jpg','1_stack.jpg','1_predlog.jpg','3_loli.jpg');
$new=array();
foreach($puctures as $value)
{
if(strchr($value,'1'))
$new[]=$value;
}
echo "<pre>"; print_r($new);
I am having following array and I want to use search and sort.Search and sort are like sorting which we do with MySQL "LIKE" condition but in array not in database.
Array
(
[4] => Varun Kumar
[14] => Jason Ince
)
Like on typing 'jas' record with Jason Ince must come out of it with keys and values and rest of the record respectively.
Do you mean something like:
foreach($yourArr as $key => $value) {
if (strpos($value, $yourString) !== false) {
//results here
}
}
You can use array_filter:
$filtered_array = array_filter($original_array, create_function($a, 'return stristr($a,"jas")!==false'));
OR, if you're using php 5.3+, syntax is:
$filtered_array = array_filter($original_array, function($a){ return stristr($a,"jas")!==false });
function arraySearch( $array, $search ) {
foreach ($array as $a ) {
if(strstr( $a, $search)){
echo $a;
}
}
return false;
}
arraySearch(array("php","mysql","search"),"my"); // will return mysql
You could also use this way:
function check($yourString)
{
foreach($yourArr as $key => $value) {
if (strpos($value, $yourString) !== false)
return strpos($value, $yourString);
}
}
So that you can check the condition if not false.
Ok I have this kind of associative array in PHP
$arr = array(
"fruit_aac" => "apple",
"fruit_2de" => "banana",
"fruit_ade" => "grapes",
"other_add" => "sugar",
"other_nut" => "coconut",
);
now what I want is to select only the elements that starts with key fruit_. How can be this possible? can I use a regex? or any PHP array functions available? Is there any workaround? Please give some examples for your solutions
$fruits = array();
foreach ($arr as $key => $value) {
if (strpos($key, 'fruit_') === 0) {
$fruits[$key] = $value;
}
}
One solution is as follows:
foreach($arr as $key => $value){
if(strpos($key, "fruit_") === 0) {
...
...
}
}
The === ensures that the string was found at position 0, since strpos can also return FALSE if string was not found.
You try it:
function filter($var) {
return strpos($var, 'fruit_') !== false;
}
$arr = array(
"fruit_aac"=>"apple",
"fruit_2de"=>"banana",
"fruit_ade"=>"grapes",
"other_add"=>"sugar",
"other_nut"=>"coconut",
);
print_r(array_flip(array_filter(array_flip($arr), 'filter')));
If you want to try regular expression then you can try code given below...
$arr = array("fruit_aac"=>"apple",
"fruit_2de"=>"banana",
"fruit_ade"=>"grapes",
"other_add"=>"sugar",
"other_nut"=>"coconut",
);
$arr2 = array();
foreach($arr AS $index=>$array){
if(preg_match("/^fruit_.*/", $index)){
$arr2[$index] = $array;
}
}
print_r($arr2);
I hope it will be helpful for you.
thanks