PHP Adding an element to the beginning of an array without changing other array numeric keys

Question

Since version PHP > 5.4 , the '+' is no longer can be use to combine 2 numeric key array. any alternative to combine 2 numeric key array without change the key? for example

myarray1 =  [0 => '-'];
myarray2 = [8 => 'CUACA BURUK' ,
            3 => 'JALAN SESAK' ,
            2 => 'KEMALANGAN' ,
            7 => 'KENDERAAN ROSAK' ,
            6 => 'KURSUS/BENGKEL/SEMINAR' ,
            9 => 'LAIN-LAIN' ,
            4 => 'LAWATAN TAPAK/KERJA LUAR' ,
            5 => 'MESYUARAT',
            ];

I want to create a combo box, the second array is an array that I get from my database and want to and additional blank option to user. I want retain the key and the element when merge the 2 array. If I using the array_merge, it will change the key.

somewhat confuse however: $myarray2[0]='-'; seems to be all you need — user557846
– user557846, Commented Oct 26, 2015 at 2:17

user2182349 · Accepted Answer · 2015-10-26 02:18:43Z

3

Since you only want to add one element to the array, I suggest populating an array from the database, then using an element assignment to create the - element, like so:

$options = [ /* Values from database */ ];
$options[0] = '-';

answered Oct 26, 2015 at 2:18

user2182349

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Comments

Sherif · Accepted Answer · 2015-10-26 02:28:37Z

I'm not sure why think that. $myarray1 + $myarray2 is and always has been a union in PHP. That behavior has never changed. A union and array_merge do two very different things, however. $myarray1 + $myarray2 will add elements to $myarray1 from $myarra2 who's keys do not already exist in $myarray1. array_merge($myarray1, $myarray2) will merge all elements together if the keys are numeric and overwrite string keys.

So in your example above...

<?php
$myarray1 = [0 => '-'];
$myarray2 = [
             8 => 'CUACA BURUK',
             3 => 'JALAN SESAK',
             2 => 'KEMALANGAN',
             7 => 'KENDERAAN ROSAK',
             6 => 'KURSUS/BENGKEL/SEMINAR',
             9 => 'LAIN-LAIN',
             4 => 'LAWATAN TAPAK/KERJA LUAR',
             5 => 'MESYUARAT'
            ];

$newArray = $myarray1 + $myarray2;

var_dump($newArray);

You get...

array(9) {
  [0]=>
  string(1) "-"
  [8]=>
  string(11) "CUACA BURUK"
  [3]=>
  string(11) "JALAN SESAK"
  [2]=>
  string(10) "KEMALANGAN"
  [7]=>
  string(15) "KENDERAAN ROSAK"
  [6]=>
  string(22) "KURSUS/BENGKEL/SEMINAR"
  [9]=>
  string(9) "LAIN-LAIN"
  [4]=>
  string(24) "LAWATAN TAPAK/KERJA LUAR"
  [5]=>
  string(9) "MESYUARAT"
}

In everything from PHP 4.3.0 to PHP 7.0.0 (tested with 3v4l.org).

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