PHP在不更改其他数组数字键的情况下将元素添加到数组的开头

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.

Answer 1

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] = '-';