How to convert multi-dimensional array into single array using php?

问题:

After implementing database queries, I am getting the multi-dimensional array below.

Two Dimensional Array

Array (     [0] => Array         (             [t1] => test1         )      [1] => Array         (             [t2] => test2         )      [2] => Array         (             [t3] => test3         )      [3] => Array         (             [t4] => test4         )      [4] => Array         (             [t5] => test5         )  ) 

but I want to convert it to a single dimensional array, like the format below.

One Dimensional Array

Array (     t1 => test1     t2 => test2     t3 => test3     t4 => test4     t5 => test5 ) 

Please help me to do so

回答1:

I think you can use array_reduce() function. For example:

   $multi= array(0 => array('t1' => 'test1'),1 => array('t2' => 'test2'),2 => array('t3' => 'test3'),3 => array('t4' => 'test4'));    $single= array_reduce($multi, 'array_merge', array());    print_r($single);  //Outputs the reduced aray 

回答2:

You can use as follows :

$newArray = array(); foreach($arrayData as $key => $value) {     foreach($value as $key2 => $value2) {         $newArray[$key2] = $value2;     } } 

Where $arrayData is your DB data array and $newArray will be the result.

回答3:

Assuming that source array is array of arrays and it has no the same keys:

<?php $src = [     ['t1'=>'test1'],     ['t2'=>'test2'],     ['t3'=>'test3'],     ['t4'=>'test4'],     ['t5'=>'test5'], ]; $result = call_user_func_array('array_merge', $src); 

result via var_dump():

array(5) {   ["t1"]=>   string(5) "test1"   ["t2"]=>   string(5) "test2"   ["t3"]=>   string(5) "test3"   ["t4"]=>   string(5) "test4"   ["t5"]=>   string(5) "test5" } 

回答4:

You can use array_reduce() to change values of array. In callback get key of item using key() and select first item using reset().

$newArr = array_reduce($oldArr, function($carry, $item){     $carry[key($item)] = reset($item);     return $carry; }); 

Check result in demo

回答5:

Try this function,

function custom_function($input_array) {     $output_array = array();     for ($i = 0; $i < count($input_array); $i++) {         for ($j = 0; $j < count($input_array[$i]); $j++) {             $output_array[key($input_array[$i])] = $input_array[$i][key($input_array[$i])];         }     }     return $output_array; }  $arr = custom_function($arr); print_r($arr); 

Give it a try, it will work.

回答6:

You can use this

<?php $temp = array(array('t1' => 'test1'), array('t2' => 'test2'), array('t3' => 'test3'), array('t4' => 'test4'), array('t5' => 'test5'));  $result_array = array(); foreach ($temp as $val) {   foreach ($val as $key => $inner_val) {     $result_array[$key] = $inner_val;   } } print_r($result_array);  ?> 

回答7:

// Multidimensional array $arrdata = Array(     '0' => Array(         't1' => 'test1'     ) ,     '1' => Array(         't2' => 'test2'     ) ,     '2' => Array(         't3' => 'test3'     ) );  // Convert to a single array $data = array(); foreach($arrdata as $key => $value) {     foreach($value as $key1 => $value1) {         $data[$key1] = $value1;     } } echo $data; 

回答8:

try something like this For your limited use case, this'll do it:

$oneDimensionalArray = array_map('current', $twoDimensionalArray); 

This can be more generalized for when the subarrays have many entries to this:

$oneDimensionalArray = call_user_func_array('array_merge', $twoDimensionalArray); 

回答9:

Try array map function.

$singleDimensionArray = array_map('current',$multiDimensionArray); 

回答10:

You can use this if you don't care about keeping the correct array keys

function flattenA(array $array) {     $return = array();     array_walk_recursive($array, function($a) use (&$return) { $return[] = $a; });     return $return; } print_r(flattenA($arr)); // Output Array (     [0] => test1     [1] => test2     [2] => test3     [3] => test4     [4] => test5 ) 

Otherwise

function flattenB(array $array) {     $return = array();     array_walk_recursive($array, function($v,$k) use (&$return) { $return[$k] = $v; });     return $return; } print_r(flattenB($arr)); // Output Array (     [t1] => test1     [t2] => test2     [t3] => test3     [t4] => test4     [t5] => test5 ) 

Check both on Sandbox

From answer on similar question

回答11:

Hey @Karan Adhikari Simple like below one:

<?php     $arr1 = array(array("t1" => "test1"), array("t2" => "test2"), array("t3" => "test3"), array("t4" => "test4"), array("t5" => "test5"));     echo "<pre>";     print_r($arr1);//before     $arr2 = array();     foreach($arr1 as $val){          $arr2 = array_merge($arr2, $val);     }     echo "<pre>";     print_r($arr2); // after you get your answer 

回答12:

Please try this function:

function array_merging($multi_array) {      if (is_array($multi_array)) {          $new_arr = array();          foreach ($multi_array as $key => $value) {              if (is_array($value)) {              $new_arr = array_merge($new_arr, array_merging($value));              }              else {                  $new_arr[$key] = $value;              }          }          return $new_arr;      }     else {         return false;     } } 

Use this function:

$your_multi_arr = array(array(array('t1'=>'test1'),array('t2'=>'test2'),array('t3'=>'test3'),array('t4'=>'test4'))); $arr1 = array_merging($your_multi_arr); echo "<pre>"; print_r($arr1); 

Hope, this may be useful for you.

回答13:

You can try traversing the array using PHP while list and each. I took sample code from PHP website the second example you can check it here

$arr = [['t1' => 'test1'],['t2' => 'test2'],['t3' => 'test3'],['t4' => 'test4'],['t5' => 'test5']]; $output = []; while (list($key, $val) = each($arr)) {     while (list($k, $v) = each($val)) {     $output[$k] = $v; } } print_r($output); 

Output created is

Array (     [t1] => test1     [t2] => test2     [t3] => test3     [t4] => test4     [t5] => test5 ) 

You can test it on your own in this Sandbox example.

回答14:

traverse the array and save the key value, Live Demo here.

<?php     $array = array(array('t1' => 'test1'), array('t2' => 'test2'), array('t3' => 'test3'), array('t4' => 'test4'), array('t5' => 'test5'));     $result = [];     array_walk($array, function($value) use(&$result){         foreach($value as $k => $v)         {             $result[$k] = $v;         }     });     var_dump($result); 

回答15:

For your specific case, i would use array_reduce where i set the init value by an empty array

array_reduce($arr, function($last, $row) {                 return $last + $row;             }, array()); 

Result :

array(     't1' => 'test1',     't2' => 'test2',     't3' => 'test3',     't4' => 'test4',     't5' => 'test5' ) 

回答16:

This will do the trick

$array = array_column($array, 't1'); 

Note: This function array_column introduced in PHP 5.5 so it won't work in earlier versions.

回答17:

`$result = "Query";  $key_value = array();`        foreach ($result as $key => $value) {           $key_value[$key['']] = $value[''];       }      //for checking //echo "<pre>" ; print_r($key_value) ; exit;       return $key_value; 

pls fill $key['name given in sql query for field'] and $value['name given in sql query for field'] (both are same)

回答18:

i would recomment my way to convert all double-dimensional array to single-dimensional array.

<?php    $single_Array = array();    //example array   $array = array(     array('t1' => 'test1'),      array('t2' => 'test2'),      array('t3' => 'test3'),      array('t4' => 'test4'),      array('t5' => 'test5'));   $size = sizeof($array);   //loop to fill the new single-dimensional array  for($count = 0; $count<sizeof($array);$count++)  {     //take the key of multi-dim array     $second_cell = key($array[$count]);     //set the value into the new array     $single_array[$count] = $array[$count][$second_cell];  }   //see the results  var_dump($single_array);   ?> 

with this script we can take keys and values to create new single-dimensional array.I hope that i was helpfull to you.

you can see the example here: Array Convert Demo

文章来源: How to convert multi-dimensional array into single array using php?