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I have one-dimensional array, e.g.
$arr = ['foo', 'bar', 'baz'];
I want convert it as follow(var_dump output):
array (size=1)
'foo' =>
array (size=1)
'bar' =>
array (size=1)
'baz' => string '' (length=0)
I can use only loop(for and/or foreach). Recursive functions is not allowed. PHP as primary programming language.
Please, help me write code for this transformation.
$r = array('a', 'b', 'c');
$res = array();
foreach (array_reverse($r) as $i) {
$tmp = $res;
$res = array();
$res[$i] = $tmp;
}
echo '<pre>', print_r($res);
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I have two arrays:
$array1 = array('104', '104', '104', '51', '228', '228');
$array2 = array('12121', '12120', '12119', '11821', '11788', '11787');
I need to create an array with two dimensions consisting of the elements of these two arrays in a specific way:
$array3 = array('104'=>array('12121', '12120', '12119'),'51'=>array('11821'),'228'=>array('11788', '11787'));
Array1 and Array2 always have the same number of elements.
How can I do this?
You can do it this way:
<?php
$array1 = ['104', '104', '104', '51', '228', '228'];
$array2 = ['12121', '12120', '12119', '11821', '11788', '11787'];
$result = [];
$index = 0;
foreach( $array1 as $key => $value ){
$result[$value][] = $array2[$index];
$index++;
}
Result:
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Is there any way to use substr() function on all of an array's elements without using a loop?
Looping is sometimes the most simple and readable solution. But if you want to apply a function to every element of an array you can also use array_map.
Here an anonymous function is a simple wrapper for substr, which is used to return the first letter of each name in the given array:
<?php
$names =
[
'Gaga',
'Joplin',
'Vega'
];
$first_letters =
array_map(
function($str) { return substr($str, 0, 1); },
$names
);
var_export($first_letters);
Output:
array (
0 => 'G',
1 => 'J',
2 => 'V',
)
Short arrow functions introduced in Php 7.4. are slightly tidier:
array_map(
fn($str) => substr($str, 0, 1),
$names
);
The foreach/loop approach:
foreach($names as $key => $name)
$result[$key] = substr($name, 0, 1);
Mutating the original array:
foreach($names as &$name)
$name = substr($name, 0, 1);
unset($name);
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I have this array:
$top = array( 'John' => '23.4', 'Andrew' => '12.3' , 'Eric' => '15', 'Will' => '10');
How I can get position by numeric value?
Ex: John will get position 4 because have high value
Eric get position 3.....
I want to find position of key by value!
Another way to do it like below,
<?php
function find_rank($name){
$top = array( 'John' => '23.4', 'Andrew' => '12.3' , 'Eric' => '15', 'Will' => '10');
asort($top);
return array_search($name,array_keys($top))+1; # array index starts from zero that's why added extra 1
}
echo find_rank('John');
WORKING DEMO: https://3v4l.org/8rp95
This is not correct way to handle this but if you really have to deal with it here is a dirty painful to read code
asort($top);
$top = array_flip(array_values(array_flip($top)));
echo $top['Eric']; // will result 2 (list starts from 0 maybe you would like to +1 to result)
Another option:
asort($top);
$top = array_combine(range(1, count(array_keys($top))), array_keys($top));
echo $eric= array_search('Eric', $top); // return 3
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The example code like here.
<?php
$new_room_result = array();
$rooms = array('single room' , 'delux room' , 'president room' , 'seavie room');
foreach($rooms as $room){
$new_room_result[] = $room;
// the next step - i want to get the index of after last inserment's index.
}
?>
Does anyone have any ideas?
foreach($rooms as $room){
$new_room_result[] = $room;
end($new_room_result); // move the internal pointer to the end of the array
$key = key($new_room_result);
var_dump($key);
}
I have find it out by array_keys() and array_pop() functions.
Whether there is a more easy way to reach what i want.
All you need to do is to get the length of the array:
$index = count($new_room_result);
after inserting, into $new_room_result its content will be
array (size=4)
0 => string 'single room' (length=11)
1 => string 'delux room' (length=10)
2 => string 'president room' (length=14)
3 => string 'seavie room' (length=11)
Last index is 3, and the index after is 4 which is the size of the array
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I have an array like
$a=array([0]=>0 [1]=>3)
$b=array([0]=>image [1]=>profile [2]=>password [3]=>login)
i want to compare array a's key value i.e 0 to array b's index value 0
Use this
$a = array(0, 3);
$b = array(0 => 'image', 1 => 'profile', 2 => 'password', 3 => 'login');
$c = array_intersect_key($b, array_flip($a));
Results
Array
(
[0] => image
[3] => login
)
Use inarray into foreach
<?php
$a = array(0,3);
$b= array('image','profile','password','login');
foreach($b as $key=>$value){
if(in_array($key, $a)) {
echo $value."<br>";
}
}
?>
Output
image
login
try array_intersect
array_intersect($a,$b);
or try === operator to compare the value in the array
<?php
$a=array(0,3);
$b=array(image,password);
foreach($a as $k=>$v){
if($a[$k]===$b[$k]){
echo "$k index is Same<br>";
}else{
echo "$k index is different<br>";
}
}
output
0 index is different
1 index is different